Today's Message Index:
----------------------
1. 06:37 AM - Yak 55 Brake Fluid Reservoir Cap (Sam Whatmough)
2. 02:22 PM - M14P Missing Oil & Hydraulic Lock (Stu)
3. 02:36 PM - Re: M14P Missing Oil & Hydraulic Lock (A. Dennis Savarese)
4. 02:46 PM - Re: M14P Missing Oil & Hydraulic Lock (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
5. 02:48 PM - Re: M14P Missing Oil & Hydraulic Lock (Peter K. Van Staagen)
6. 02:50 PM - Re: M14P Missing Oil & Hydraulic Lock (Stephen Fox)
7. 02:52 PM - Re: M14P Missing Oil & Hydraulic Lock (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
8. 03:07 PM - Re: M14P Missing Oil & Hydraulic Lock (A. Dennis Savarese)
9. 03:11 PM - Re: M14P Missing Oil & Hydraulic Lock (A. Dennis Savarese)
10. 03:17 PM - Re: M14P Missing Oil & Hydraulic Lock (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
11. 03:19 PM - Re: M14P Missing Oil & Hydraulic Lock (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
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| Subject: | Yak 55 Brake Fluid Reservoir Cap |
Does anyone know where I can get a Brake fluid reservoir cap for a Yak
55? It has a breather hole in it but a device to seal it off under
negative G.
Many thanks Guys!
Sam Whatmough
sam.whatmough@gmail.com
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| Subject: | M14P Missing Oil & Hydraulic Lock |
Greetings fellow Yakmeisters. I have been lurking around this list for sometime,
now have a Yak and seek help.
Our M14P has about 870 hrs. Recently, after the airplane sits for a week or two,
it has been prone to hydraulic lock in the no. 6 (lower left when viewed from
the front) cylinder. Another puzzling phenomenon started at about the same
time: when cold, the reservoir oil level (as indicated by the dipstick) may read
several litres lower than after the last run. After running the engine again,
oil level mysteriously returns back up to where it ought to have been.
Our mechanic reports this problem is probably related to a faulty checkvalve in
the oil pump assembly. This valve is supposed to prevent oil from backflowing
out of the sump back into the crankcase when the engine isn't running. In higher
time engines, the valve is prone to leak, allowing oil to drain back through
the pump into the crankcase and lower cylinder(s). That explains both the
missing oil and the hydraulic lock.
Apparently the fix is either a rebuild of the oil pump and associated check valve
or a separate new check valve retrofitted between the pump and the sump. The
new valve is less troublesome than a pump rebuild, but still costs about $1500
installed (the valve itself is around $500).
Because accumulation of too much oil in the crankcase may affect other components,
the mechanic recommends doing something soon. In the meantime I presume the
approach should be to pull it through more than normal to get excess oil from
the crankcase back to the sump.
Any comments on the diagnosis, fix or what to do in the meantime?
--------
Stewart Nicholson
Yak 52 N122GC
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=210028#210028
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| Subject: | Re: M14P Missing Oil & Hydraulic Lock |
Stu,
Diagnosis is somewhat correct. The oil leaks from the oil tank past the
oil pump shut off valve and down into the sump. You could make a very
simple oil drain tube from the front sump drain into a clean gallon or 2
gallon container with a sealed cap or lid. Attach a flexible hose to
the sump drain through a hole which you can drill in the bottom of the
cowling. Then open the sump drain after you fly and the excess oil will
drain into the container. Pour the excess oil that drained into the
container back into the oil tank before you fly the next time.
The correct repair is to have the oil pump overhauled by M14P, Inc./Carl
and Jill. The external oil shut off works very well. But as you said,
is expensive to install. Actually, the external oil shut off is a
"band-aide" to the problem, which is the oil pump.
Dennis
----- Original Message -----
From: Stu
To: yak-list@matronics.com
Sent: Thursday, October 23, 2008 4:22 PM
Subject: Yak-List: M14P Missing Oil & Hydraulic Lock
Greetings fellow Yakmeisters. I have been lurking around this list
for sometime, now have a Yak and seek help.
Our M14P has about 870 hrs. Recently, after the airplane sits for a
week or two, it has been prone to hydraulic lock in the no. 6 (lower
left when viewed from the front) cylinder. Another puzzling phenomenon
started at about the same time: when cold, the reservoir oil level (as
indicated by the dipstick) may read several litres lower than after the
last run. After running the engine again, oil level mysteriously returns
back up to where it ought to have been.
Our mechanic reports this problem is probably related to a faulty
checkvalve in the oil pump assembly. This valve is supposed to prevent
oil from backflowing out of the sump back into the crankcase when the
engine isn't running. In higher time engines, the valve is prone to
leak, allowing oil to drain back through the pump into the crankcase and
lower cylinder(s). That explains both the missing oil and the hydraulic
lock.
Apparently the fix is either a rebuild of the oil pump and associated
check valve or a separate new check valve retrofitted between the pump
and the sump. The new valve is less troublesome than a pump rebuild, but
still costs about $1500 installed (the valve itself is around $500).
Because accumulation of too much oil in the crankcase may affect other
components, the mechanic recommends doing something soon. In the
meantime I presume the approach should be to pull it through more than
normal to get excess oil from the crankcase back to the sump.
Any comments on the diagnosis, fix or what to do in the meantime?
--------
Stewart Nicholson
Yak 52 N122GC
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=210028#210028
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| Subject: | M14P Missing Oil & Hydraulic Lock |
Stu, that is because of the engines lower oil sump. That is the same general location
where your engine oil drain on the front itself is located.
What you should be doing is to run the engine at about 60-70% or so for at least
30 seconds before engine shut down. This allows the pump for the sump to scavenge
all the oil out and feed it back to the tank where the dip stick is. Then
bring the engine back to idle and turn off the mags. As you do this, during
and NOT after, open the throttle all the way. This sucks in cool air and helps
to set the rings. Or at least that is what people say anyway regarding the
throttle issue. It IS in the Russian check list, so it must do SOMETHING!
As the engine sits not running..... The oil will creep down from the tank, reverse
feed through the oil pump, through a worn ball check valve that is supposed
to prevent this, and will work it's way to the lowest point in the engine again...
Which is of course the lower sump.
Now your dipstick reads lower... About 2 liters or so lower.. And will go lower
still as the cylinders start filling up.
Start the engine again, the oil is pumped back to the main tank, and the oil level
magically goes back up. This is what is happening and it is fairly normal.
The oil in the cylinders will stream out the exhaust pipes as you pull the
engine through before starting, which of course you are doing.... Right?
By the way, once the sump fills all the way up, the next thing is that oil will
start going into your cylinders, and also coming out the exhaust valves and running
out the exhaust pipes. This is what we have been talking about vis--vis
a "Hydraulic Lock" recently however in that case the exhaust valve is closed
and the oil fills the combustion chamber and goes no where when you rotate the
engine and bring the piston up. Read the previous posts.
The "fix" for your problem is the same fix as has been described for the Hyd Lock
issues.
Best Regards and Welcome Aboard!
Mark Bitterlich
N50YK
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Stu
Sent: Thursday, October 23, 2008 5:22 PM
Subject: Yak-List: M14P Missing Oil & Hydraulic Lock
Greetings fellow Yakmeisters. I have been lurking around this list for sometime,
now have a Yak and seek help.
Our M14P has about 870 hrs. Recently, after the airplane sits for a week or two,
it has been prone to hydraulic lock in the no. 6 (lower left when viewed from
the front) cylinder. Another puzzling phenomenon started at about the same
time: when cold, the reservoir oil level (as indicated by the dipstick) may read
several litres lower than after the last run. After running the engine again,
oil level mysteriously returns back up to where it ought to have been.
Our mechanic reports this problem is probably related to a faulty checkvalve in
the oil pump assembly. This valve is supposed to prevent oil from backflowing
out of the sump back into the crankcase when the engine isn't running. In higher
time engines, the valve is prone to leak, allowing oil to drain back through
the pump into the crankcase and lower cylinder(s). That explains both the
missing oil and the hydraulic lock.
Apparently the fix is either a rebuild of the oil pump and associated check valve
or a separate new check valve retrofitted between the pump and the sump. The
new valve is less troublesome than a pump rebuild, but still costs about $1500
installed (the valve itself is around $500).
Because accumulation of too much oil in the crankcase may affect other components,
the mechanic recommends doing something soon. In the meantime I presume the
approach should be to pull it through more than normal to get excess oil from
the crankcase back to the sump.
Any comments on the diagnosis, fix or what to do in the meantime?
--------
Stewart Nicholson
Yak 52 N122GC
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=210028#210028
Message 5
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| Subject: | M14P Missing Oil & Hydraulic Lock |
The fix is even more simple than you think. Just fly it more. My plane does
the same thing, but if I fly it once a week or more it doesn't do it. Your
plane is simply begging for more attention. :-)
Personally I would rebuild the pump or buy one rather than a band aid fix.
If the check valve is wearing out, how far behind is the rest of the pump.
And Congrats on buying a Yak, you made the best choice. :-)
Pete
__|__
__|__ ----=(*)=----
__|__ ----=(*)=----
__|__ ----=(*)=----
----=(*)=----
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Stu
Sent: Thursday, October 23, 2008 4:22 PM
Subject: Yak-List: M14P Missing Oil & Hydraulic Lock
Greetings fellow Yakmeisters. I have been lurking around this list for
sometime, now have a Yak and seek help.
Our M14P has about 870 hrs. Recently, after the airplane sits for a week or
two, it has been prone to hydraulic lock in the no. 6 (lower left when
viewed from the front) cylinder. Another puzzling phenomenon started at
about the same time: when cold, the reservoir oil level (as indicated by the
dipstick) may read several litres lower than after the last run. After
running the engine again, oil level mysteriously returns back up to where it
ought to have been.
Our mechanic reports this problem is probably related to a faulty checkvalve
in the oil pump assembly. This valve is supposed to prevent oil from
backflowing out of the sump back into the crankcase when the engine isn't
running. In higher time engines, the valve is prone to leak, allowing oil
to drain back through the pump into the crankcase and lower cylinder(s).
That explains both the missing oil and the hydraulic lock.
Apparently the fix is either a rebuild of the oil pump and associated check
valve or a separate new check valve retrofitted between the pump and the
sump. The new valve is less troublesome than a pump rebuild, but still costs
about $1500 installed (the valve itself is around $500).
Because accumulation of too much oil in the crankcase may affect other
components, the mechanic recommends doing something soon. In the meantime I
presume the approach should be to pull it through more than normal to get
excess oil from the crankcase back to the sump.
Any comments on the diagnosis, fix or what to do in the meantime?
--------
Stewart Nicholson
Yak 52 N122GC
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=210028#210028
Message 6
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| Subject: | Re: M14P Missing Oil & Hydraulic Lock |
Question:
1) Do you have a drain kit?
Next
As to the oil reading low when cold then coming back up. Ok somebody
with more knowledge can give you a better answer, but Cliff Coy once
reminded me not to trus oil level in Main tank when plane had been
sitting and is cold once it runs and warms up it is liable to come
up. The why I can no longer recall.
Stephen Fox
Consulting Partner/Facilitator & Trainer
thinkx Intellectual Capital
innovation drives productivity
ideas drive innovation
thinkx drives ideas
http://www.thinkxic.com
email: steve.fox@thinkxic.com
Boston Office: 617-379-0865
New Hampshire: 603.924.8660
On Oct 23, 2008, at 5:22 PM, Stu wrote:
>
> Greetings fellow Yakmeisters. I have been lurking around this list
> for sometime, now have a Yak and seek help.
>
> Our M14P has about 870 hrs. Recently, after the airplane sits for
> a week or two, it has been prone to hydraulic lock in the no. 6
> (lower left when viewed from the front) cylinder. Another puzzling
> phenomenon started at about the same time: when cold, the reservoir
> oil level (as indicated by the dipstick) may read several litres
> lower than after the last run. After running the engine again, oil
> level mysteriously returns back up to where it ought to have been.
>
> Our mechanic reports this problem is probably related to a faulty
> checkvalve in the oil pump assembly. This valve is supposed to
> prevent oil from backflowing out of the sump back into the
> crankcase when the engine isn't running. In higher time engines,
> the valve is prone to leak, allowing oil to drain back through the
> pump into the crankcase and lower cylinder(s). That explains both
> the missing oil and the hydraulic lock.
>
> Apparently the fix is either a rebuild of the oil pump and
> associated check valve or a separate new check valve retrofitted
> between the pump and the sump. The new valve is less troublesome
> than a pump rebuild, but still costs about $1500 installed (the
> valve itself is around $500).
>
> Because accumulation of too much oil in the crankcase may affect
> other components, the mechanic recommends doing something soon. In
> the meantime I presume the approach should be to pull it through
> more than normal to get excess oil from the crankcase back to the
> sump.
>
> Any comments on the diagnosis, fix or what to do in the meantime?
>
> --------
> Stewart Nicholson
> Yak 52 N122GC
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=210028#210028
>
>
Message 7
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| Subject: | M14P Missing Oil & Hydraulic Lock |
Stu, like an idiot I did not read your whole post.
My personal opinion.
I would not put another check valve in the line to the pump.
I would consider putting a mechanical VALVE in there that you can turn
on and off MANUALLY.
Yes, you can fix the ball check valve in the pump, but it is going to
start leaking again sooner or later, they all do. The manual valve
stops this problem dead in it's tracks. The only problem is if you
forget to turn it on before starting the engine. Put an interupter
switch on there that prevents the starter button from working (easy) and
you are 90% safe from being stupid and toasting an engine.
Excess oil into the bottom of the engine does not hurt a thing, unless
you fail to get it out of the cylinders and intakes manifolds before the
next start. Then it can ruin the engine. I've lost GALLONS out the
exhaust ... Didn't hurt a thing.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Stu
Sent: Thursday, October 23, 2008 5:22 PM
Subject: Yak-List: M14P Missing Oil & Hydraulic Lock
Greetings fellow Yakmeisters. I have been lurking around this list for
sometime, now have a Yak and seek help.
Our M14P has about 870 hrs. Recently, after the airplane sits for a
week or two, it has been prone to hydraulic lock in the no. 6 (lower
left when viewed from the front) cylinder. Another puzzling phenomenon
started at about the same time: when cold, the reservoir oil level (as
indicated by the dipstick) may read several litres lower than after the
last run. After running the engine again, oil level mysteriously returns
back up to where it ought to have been.
Our mechanic reports this problem is probably related to a faulty
checkvalve in the oil pump assembly. This valve is supposed to prevent
oil from backflowing out of the sump back into the crankcase when the
engine isn't running. In higher time engines, the valve is prone to
leak, allowing oil to drain back through the pump into the crankcase and
lower cylinder(s). That explains both the missing oil and the hydraulic
lock.
Apparently the fix is either a rebuild of the oil pump and associated
check valve or a separate new check valve retrofitted between the pump
and the sump. The new valve is less troublesome than a pump rebuild, but
still costs about $1500 installed (the valve itself is around $500).
Because accumulation of too much oil in the crankcase may affect other
components, the mechanic recommends doing something soon. In the
meantime I presume the approach should be to pull it through more than
normal to get excess oil from the crankcase back to the sump.
Any comments on the diagnosis, fix or what to do in the meantime?
--------
Stewart Nicholson
Yak 52 N122GC
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=210028#210028
Message 8
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| Subject: | Re: M14P Missing Oil & Hydraulic Lock |
Mark,
The Kimball shut off valve kit has an electrical interface to the start
circuit and is a electro-mechanical mechanism. If anything fails in the
starting circuit, the valve will not open and thus the engine will not
start. Also machined out of billet aluminum. The Kimball's always make
quality stuff though.
http://www.jimkimballenterprises.com/web/zoom.php?id_lavoro=15&immagine
=images/prodotti/10.jpg&w=640&h=534
"Fully CNC machined oil shut off valve. Equipped with cable connector
and Starter interrupt micro switch (not shown). Female 3/4 NPT threads
in and out for connection to oil system. Cable not included."
Dennis
----- Original Message -----
From: Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E
To: yak-list@matronics.com
Sent: Thursday, October 23, 2008 4:52 PM
Subject: RE: Yak-List: M14P Missing Oil & Hydraulic Lock
Point, MALS-14 64E" <mark.bitterlich@navy.mil>
Stu, like an idiot I did not read your whole post.
My personal opinion.
I would not put another check valve in the line to the pump.
I would consider putting a mechanical VALVE in there that you can turn
on and off MANUALLY.
Yes, you can fix the ball check valve in the pump, but it is going to
start leaking again sooner or later, they all do. The manual valve
stops this problem dead in it's tracks. The only problem is if you
forget to turn it on before starting the engine. Put an interupter
switch on there that prevents the starter button from working (easy)
and
you are 90% safe from being stupid and toasting an engine.
Excess oil into the bottom of the engine does not hurt a thing, unless
you fail to get it out of the cylinders and intakes manifolds before
the
next start. Then it can ruin the engine. I've lost GALLONS out the
exhaust ... Didn't hurt a thing.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Stu
Sent: Thursday, October 23, 2008 5:22 PM
To: yak-list@matronics.com
Subject: Yak-List: M14P Missing Oil & Hydraulic Lock
Greetings fellow Yakmeisters. I have been lurking around this list
for
sometime, now have a Yak and seek help.
Our M14P has about 870 hrs. Recently, after the airplane sits for a
week or two, it has been prone to hydraulic lock in the no. 6 (lower
left when viewed from the front) cylinder. Another puzzling phenomenon
started at about the same time: when cold, the reservoir oil level (as
indicated by the dipstick) may read several litres lower than after
the
last run. After running the engine again, oil level mysteriously
returns
back up to where it ought to have been.
Our mechanic reports this problem is probably related to a faulty
checkvalve in the oil pump assembly. This valve is supposed to
prevent
oil from backflowing out of the sump back into the crankcase when the
engine isn't running. In higher time engines, the valve is prone to
leak, allowing oil to drain back through the pump into the crankcase
and
lower cylinder(s). That explains both the missing oil and the
hydraulic
lock.
Apparently the fix is either a rebuild of the oil pump and associated
check valve or a separate new check valve retrofitted between the pump
and the sump. The new valve is less troublesome than a pump rebuild,
but
still costs about $1500 installed (the valve itself is around $500).
Because accumulation of too much oil in the crankcase may affect other
components, the mechanic recommends doing something soon. In the
meantime I presume the approach should be to pull it through more than
normal to get excess oil from the crankcase back to the sump.
Any comments on the diagnosis, fix or what to do in the meantime?
--------
Stewart Nicholson
Yak 52 N122GC
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=210028#210028
Message 9
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| Subject: | Re: M14P Missing Oil & Hydraulic Lock |
Here's the link to all of the M14 stuff from Jim Kimball Enterprises.
Look at the bottom of the list of stuff for the entire Clean Kit. Their
item number is M14P-24.
http://www.jimkimballenterprises.com/web/m14p.php
Dennis
----- Original Message -----
From: Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E
To: yak-list@matronics.com
Sent: Thursday, October 23, 2008 4:52 PM
Subject: RE: Yak-List: M14P Missing Oil & Hydraulic Lock
Point, MALS-14 64E" <mark.bitterlich@navy.mil>
Stu, like an idiot I did not read your whole post.
My personal opinion.
I would not put another check valve in the line to the pump.
I would consider putting a mechanical VALVE in there that you can turn
on and off MANUALLY.
Yes, you can fix the ball check valve in the pump, but it is going to
start leaking again sooner or later, they all do. The manual valve
stops this problem dead in it's tracks. The only problem is if you
forget to turn it on before starting the engine. Put an interupter
switch on there that prevents the starter button from working (easy)
and
you are 90% safe from being stupid and toasting an engine.
Excess oil into the bottom of the engine does not hurt a thing, unless
you fail to get it out of the cylinders and intakes manifolds before
the
next start. Then it can ruin the engine. I've lost GALLONS out the
exhaust ... Didn't hurt a thing.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Stu
Sent: Thursday, October 23, 2008 5:22 PM
To: yak-list@matronics.com
Subject: Yak-List: M14P Missing Oil & Hydraulic Lock
Greetings fellow Yakmeisters. I have been lurking around this list
for
sometime, now have a Yak and seek help.
Our M14P has about 870 hrs. Recently, after the airplane sits for a
week or two, it has been prone to hydraulic lock in the no. 6 (lower
left when viewed from the front) cylinder. Another puzzling phenomenon
started at about the same time: when cold, the reservoir oil level (as
indicated by the dipstick) may read several litres lower than after
the
last run. After running the engine again, oil level mysteriously
returns
back up to where it ought to have been.
Our mechanic reports this problem is probably related to a faulty
checkvalve in the oil pump assembly. This valve is supposed to
prevent
oil from backflowing out of the sump back into the crankcase when the
engine isn't running. In higher time engines, the valve is prone to
leak, allowing oil to drain back through the pump into the crankcase
and
lower cylinder(s). That explains both the missing oil and the
hydraulic
lock.
Apparently the fix is either a rebuild of the oil pump and associated
check valve or a separate new check valve retrofitted between the pump
and the sump. The new valve is less troublesome than a pump rebuild,
but
still costs about $1500 installed (the valve itself is around $500).
Because accumulation of too much oil in the crankcase may affect other
components, the mechanic recommends doing something soon. In the
meantime I presume the approach should be to pull it through more than
normal to get excess oil from the crankcase back to the sump.
Any comments on the diagnosis, fix or what to do in the meantime?
--------
Stewart Nicholson
Yak 52 N122GC
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=210028#210028
Message 10
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| Subject: | M14P Missing Oil & Hydraulic Lock |
Unless you run out of air and get out to prop the darn thing. It'll
start right up.
Don't get me wrong. I want it, I will wire it that way as well, but
there always seems to be some way to screw up no matter what you do.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis
Savarese
Sent: Thursday, October 23, 2008 6:07 PM
Subject: Re: Yak-List: M14P Missing Oil & Hydraulic Lock
Mark,
The Kimball shut off valve kit has an electrical interface to the start
circuit and is a electro-mechanical mechanism. If anything fails in the
starting circuit, the valve will not open and thus the engine will not
start. Also machined out of billet aluminum. The Kimball's always make
quality stuff though.
http://www.jimkimballenterprises.com/web/zoom.php?id_lavoro=15&immagine
images/prodotti/10.jpg&w=640&h=534
"Fully CNC machined oil shut off valve. Equipped with cable connector
and Starter interrupt micro switch (not shown). Female 3/4 NPT threads
in and out for connection to oil system. Cable not included."
Dennis
----- Original Message -----
From: Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E
<mailto:mark.bitterlich@navy.mil>
To: yak-list@matronics.com
Sent: Thursday, October 23, 2008 4:52 PM
Subject: RE: Yak-List: M14P Missing Oil & Hydraulic Lock
Cherry Point, MALS-14 64E" <mark.bitterlich@navy.mil>
Stu, like an idiot I did not read your whole post.
My personal opinion.
I would not put another check valve in the line to the pump.
I would consider putting a mechanical VALVE in there that you
can turn
on and off MANUALLY.
Yes, you can fix the ball check valve in the pump, but it is
going to
start leaking again sooner or later, they all do. The manual
valve
stops this problem dead in it's tracks. The only problem is if
you
forget to turn it on before starting the engine. Put an
interupter
switch on there that prevents the starter button from working
(easy) and
you are 90% safe from being stupid and toasting an engine.
Excess oil into the bottom of the engine does not hurt a thing,
unless
you fail to get it out of the cylinders and intakes manifolds
before the
next start. Then it can ruin the engine. I've lost GALLONS out
the
exhaust ... Didn't hurt a thing.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Stu
Sent: Thursday, October 23, 2008 5:22 PM
To: yak-list@matronics.com
Subject: Yak-List: M14P Missing Oil & Hydraulic Lock
Greetings fellow Yakmeisters. I have been lurking around this
list for
sometime, now have a Yak and seek help.
Our M14P has about 870 hrs. Recently, after the airplane sits
for a
week or two, it has been prone to hydraulic lock in the no. 6
(lower
left when viewed from the front) cylinder. Another puzzling
phenomenon
started at about the same time: when cold, the reservoir oil
level (as
indicated by the dipstick) may read several litres lower than
after the
last run. After running the engine again, oil level mysteriously
returns
back up to where it ought to have been.
Our mechanic reports this problem is probably related to a
faulty
checkvalve in the oil pump assembly. This valve is supposed to
prevent
oil from backflowing out of the sump back into the crankcase
when the
engine isn't running. In higher time engines, the valve is
prone to
leak, allowing oil to drain back through the pump into the
crankcase and
lower cylinder(s). That explains both the missing oil and the
hydraulic
lock.
Apparently the fix is either a rebuild of the oil pump and
associated
check valve or a separate new check valve retrofitted between
the pump
and the sump. The new valve is less troublesome than a pump
rebuild, but
still costs about $1500 installed (the valve itself is around
$500).
Because accumulation of too much oil in the crankcase may affect
other
components, the mechanic recommends doing something soon. In
the
meantime I presume the approach should be to pull it through
more than
normal to get excess oil from the crankcase back to the sump.
Any comments on the diagnosis, fix or what to do in the
meantime?
--------
Stewart Nicholson
Yak 52 N122GC
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=210028#210028
http://www.matronicsnbsp; via the Web
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
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| Subject: | M14P Missing Oil & Hydraulic Lock |
By the way, now if someone would JUST take the time to make up a few
hoses and fittings for this valve so that all you had to do was to pull
out the old and install the new .... One could make some money, exactly
as in spark plug wire kits!
Yes... I'm lazy. But then.. So are a lot of other people!
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis
Savarese
Sent: Thursday, October 23, 2008 6:07 PM
Subject: Re: Yak-List: M14P Missing Oil & Hydraulic Lock
Mark,
The Kimball shut off valve kit has an electrical interface to the start
circuit and is a electro-mechanical mechanism. If anything fails in the
starting circuit, the valve will not open and thus the engine will not
start. Also machined out of billet aluminum. The Kimball's always make
quality stuff though.
http://www.jimkimballenterprises.com/web/zoom.php?id_lavoro=15&immagine
images/prodotti/10.jpg&w=640&h=534
"Fully CNC machined oil shut off valve. Equipped with cable connector
and Starter interrupt micro switch (not shown). Female 3/4 NPT threads
in and out for connection to oil system. Cable not included."
Dennis
----- Original Message -----
From: Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E
<mailto:mark.bitterlich@navy.mil>
To: yak-list@matronics.com
Sent: Thursday, October 23, 2008 4:52 PM
Subject: RE: Yak-List: M14P Missing Oil & Hydraulic Lock
Cherry Point, MALS-14 64E" <mark.bitterlich@navy.mil>
Stu, like an idiot I did not read your whole post.
My personal opinion.
I would not put another check valve in the line to the pump.
I would consider putting a mechanical VALVE in there that you
can turn
on and off MANUALLY.
Yes, you can fix the ball check valve in the pump, but it is
going to
start leaking again sooner or later, they all do. The manual
valve
stops this problem dead in it's tracks. The only problem is if
you
forget to turn it on before starting the engine. Put an
interupter
switch on there that prevents the starter button from working
(easy) and
you are 90% safe from being stupid and toasting an engine.
Excess oil into the bottom of the engine does not hurt a thing,
unless
you fail to get it out of the cylinders and intakes manifolds
before the
next start. Then it can ruin the engine. I've lost GALLONS out
the
exhaust ... Didn't hurt a thing.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Stu
Sent: Thursday, October 23, 2008 5:22 PM
To: yak-list@matronics.com
Subject: Yak-List: M14P Missing Oil & Hydraulic Lock
Greetings fellow Yakmeisters. I have been lurking around this
list for
sometime, now have a Yak and seek help.
Our M14P has about 870 hrs. Recently, after the airplane sits
for a
week or two, it has been prone to hydraulic lock in the no. 6
(lower
left when viewed from the front) cylinder. Another puzzling
phenomenon
started at about the same time: when cold, the reservoir oil
level (as
indicated by the dipstick) may read several litres lower than
after the
last run. After running the engine again, oil level mysteriously
returns
back up to where it ought to have been.
Our mechanic reports this problem is probably related to a
faulty
checkvalve in the oil pump assembly. This valve is supposed to
prevent
oil from backflowing out of the sump back into the crankcase
when the
engine isn't running. In higher time engines, the valve is
prone to
leak, allowing oil to drain back through the pump into the
crankcase and
lower cylinder(s). That explains both the missing oil and the
hydraulic
lock.
Apparently the fix is either a rebuild of the oil pump and
associated
check valve or a separate new check valve retrofitted between
the pump
and the sump. The new valve is less troublesome than a pump
rebuild, but
still costs about $1500 installed (the valve itself is around
$500).
Because accumulation of too much oil in the crankcase may affect
other
components, the mechanic recommends doing something soon. In
the
meantime I presume the approach should be to pull it through
more than
normal to get excess oil from the crankcase back to the sump.
Any comments on the diagnosis, fix or what to do in the
meantime?
--------
Stewart Nicholson
Yak 52 N122GC
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=210028#210028
http://www.matronicsnbsp; via the Web
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
===============
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