Today's Message Index:
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1. 06:11 AM - Leaky Oil Sump Valve and Rocker Bolt Leaks (PSalter@aol.com)
2. 06:32 AM - Re: Leaky Oil Sump Valve and Rocker Bolt Leaks (A. Dennis Savarese)
3. 06:41 AM - Re: Leaky Oil Sump Valve and Rocker Bolt Leaks (Bradly Banks)
4. 07:10 AM - Re: Leaky Oil Sump Valve and Rocker Bolt Leaks (Roger Kemp MD)
5. 09:50 AM - Re: Leaky Oil Sump Valve and Rocker Bolt Leaks (doug sapp)
6. 11:11 AM - Re: Leaky Oil Sump Valve and Rocker Bolt Leaks (Tom Elliott)
7. 06:24 PM - Leaky rocker arm washers (Cpayne)
8. 08:14 PM - Re: Leaky rocker arm washers (Roger Kemp M.D.)
9. 09:59 PM - Nanchang MAUW (Jay McIntyre)
Message 1
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| Subject: | Leaky Oil Sump Valve and Rocker Bolt Leaks |
Does anyone know of a repair, as in seals or modifications, to stop oil
dripping from my sump drain valve?
What is the process for stopping leaks around the bolt head and nut of the
rockers? I have in the past, pushed the bolt out with something close to
the same size as the bolt, to replace crush washers. Is there a simple
solution?
Thanks
Phil
Message 2
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| Subject: | Re: Leaky Oil Sump Valve and Rocker Bolt Leaks |
Phil,
Remove the sump drain valve during your next oil change and chip
detector screen check. Disassemble the sump drain valve and hand polish
the rotating portion of valve and the seat with 320-400 grit wet/dry
sandpaper. Then coat the rotating section with "fuel lube". It can be
purchased from Aircraft Spruce.
http://www.aircraftspruce.com/catalog/cspages/ezturnlube.php Fuel Lube
is a paste like material that is unaffected by fuel and oil. THEN
purchase a rubber cork from your local hardware store and plug the
opening in the valve.
The only solution that I know of for the leaks around the rocker arm
bolts is replacing the crush washers. Do check how tight the
castellated nuts are though. If they are loose, you can re tighten them
and see if that helps stop the leaks. Otherwise you'll just have to
replace the crush washers.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 2/13/2012 8:08 AM, PSalter@aol.com wrote:
> Does anyone know of a repair, as in seals or modifications, to stop
> oil dripping from my sump drain valve?
> What is the process for stopping leaks around the bolt head and nut of
> the rockers? I have in the past, pushed the bolt out with something
> close to the same size as the bolt, to replace crush washers. Is there
> a simple solution?
> Thanks
> Phil
> *
>
>
> *
Message 3
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| Subject: | Leaky Oil Sump Valve and Rocker Bolt Leaks |
Some commercial Hydraulic companies sell what is called a =93Dowty
washer=94
it=92s a washer with a rubber seal moulded on to it and ranges from
=BC=94 right
up to 2=94. Its commonly used where a limited amount of torque is
permissible
on the fitting you are fastening. Here is a link=85
http://www.google.co.za/imgres?imgurl=http://www.speedflowshop.co.uk/ek
mps/s
hops/speedflow/images/513_08.07.jpg
<http://www.google.co.za/imgres?imgurl=http://www.speedflowshop.co.uk/e
kmps/
shops/speedflow/images/513_08.07.jpg&imgrefurl=http://www.speedflowshop
.co.u
k/-4-dowty-seal-513-04-384-p.asp&h=342&w=336&sz=14&tbnid=pxF2esrn
ymfQ6M:&tbn
h=90&tbnw=88&prev=/search%3Fq%3Ddowty%2Bwasher%26tbm%3Disch%26tbo%3
Du&zoom=1
&q=dowty+washer&docid=6hZ7O9sFvwT0LM&hl=en&sa=X&ei=pSA5T7nHI-WR
0AWthrXBAg&sq
i=2&ved=0CD0Q9QEwAw&dur=46>
&imgrefurl=http://www.speedflowshop.co.uk/-4-dowty-seal-513-04-384-p.as
p&h=3
42&w=336&sz=14&tbnid=pxF2esrnymfQ6M:&tbnh=90&tbnw=88&prev=/se
arch%3Fq%3Ddowt
y%2Bwasher%26tbm%3Disch%26tbo%3Du&zoom=1&q=dowty+washer&docid=6hZ7O
9sFvwT0LM
&hl=en&sa=X&ei=pSA5T7nHI-WR0AWthrXBAg&sqi=2&ved=0CD0Q9QEwAw&dur
=46
hope this helps
Brad
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of
PSalter@aol.com
Sent: 13 February 2012 04:09 PM
Subject: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks
Does anyone know of a repair, as in seals or modifications, to stop oil
dripping from my sump drain valve?
What is the process for stopping leaks around the bolt head and nut of
the
rockers? I have in the past, pushed the bolt out with something close to
the
same size as the bolt, to replace crush washers. Is there a simple
solution?
Thanks
Phil
Message 4
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| Subject: | Leaky Oil Sump Valve and Rocker Bolt Leaks |
Doug Sapp and George Coy can supply the crush washers. There is a trick
there though. There is one washer that sits in the recess of the rocker
box
that is the same thickness as the crush washer under the nut head of the
rocker axle (bolt) and the conciliated nut. It is roughly half the
diameter
of the outer crush washer. Both have to be replaced to stop the leak.
The
Dowty Washer will work for a while but you are not repairing the worn
inner
washer that is allowing some wobble of the rocker arm itself leading to
the
pesky leak. It takes two of each size washer. The inner washer is
pressed
lightly in so you will have to drive it out gently. It is easy to
remove.
I have a rocker arm bolt I am going to have to replace due to the worn
inner
washer on the engine I am rebuilding.
As Dennis says, polishing the stop cock on the sump drain will help.
Have
seen him do it a number of times with great results. Need to do it on my
52
but time is the rate critical step at this time. I can live with it for
now.
Sorry don=92t have my parts manual near so can=92t give you the parts
numbers
for the two washers as they pertain to the M-14.
Doc
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Bradly Banks
Sent: Monday, February 13, 2012 8:41 AM
Subject: RE: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks
Some commercial Hydraulic companies sell what is called a =93Dowty
washer=94
it=92s a washer with a rubber seal moulded on to it and ranges from
=BC=94 right
up to 2=94. Its commonly used where a limited amount of torque is
permissible
on the fitting you are fastening. Here is a link=85
http://www.google.co.za/imgres?imgurl=http://www.speedflowshop.co.uk/ek
mps/s
hops/speedflow/images/513_08.07.jpg
<http://www.google.co.za/imgres?imgurl=http://www.speedflowshop.co.uk/e
kmps/
shops/speedflow/images/513_08.07.jpg&imgrefurl=http://www.speedflowshop
.co.u
k/-4-dowty-seal-513-04-384-p.asp&h=342&w=336&sz=14&tbnid=pxF2esrn
ymfQ6M:&tbn
h=90&tbnw=88&prev=/search%3Fq%3Ddowty%2Bwasher%26tbm%3Disch%26tbo%3
Du&zoom=1
&q=dowty+washer&docid=6hZ7O9sFvwT0LM&hl=en&sa=X&ei=pSA5T7nHI-WR
0AWthrXBAg&sq
i=2&ved=0CD0Q9QEwAw&dur=46>
&imgrefurl=http://www.speedflowshop.co.uk/-4-dowty-seal-513-04-384-p.as
p&h=3
42&w=336&sz=14&tbnid=pxF2esrnymfQ6M:&tbnh=90&tbnw=88&prev=/se
arch%3Fq%3Ddowt
y%2Bwasher%26tbm%3Disch%26tbo%3Du&zoom=1&q=dowty+washer&docid=6hZ7O
9sFvwT0LM
&hl=en&sa=X&ei=pSA5T7nHI-WR0AWthrXBAg&sqi=2&ved=0CD0Q9QEwAw&dur
=46
hope this helps
Brad
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of
PSalter@aol.com
Sent: 13 February 2012 04:09 PM
Subject: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks
Does anyone know of a repair, as in seals or modifications, to stop oil
dripping from my sump drain valve?
What is the process for stopping leaks around the bolt head and nut of
the
rockers? I have in the past, pushed the bolt out with something close to
the
same size as the bolt, to replace crush washers. Is there a simple
solution?
Thanks
Phil
http://www.matronics.com/Navigator?Yak-List
http://forums.matronics.com
http://www.matronics.com/contribution
Message 5
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| Subject: | Re: Leaky Oil Sump Valve and Rocker Bolt Leaks |
Phil,
We carry the rocker washers in stock. Ours are .003 thicker than stock
which adds a little bit more material to help out with a persistent leak.
Great care should be taken to make 100% sure that all of the needle
bearings are in fact present and accounted for. I have seen several
engines with missing roller bearings which will in time result in abnormal
wear and render the cylinder unserviceable.
For those of you who have pushed out the bolt only to hear the sound of
scattering bearings there are 56 of the little rascals in each bearing
point.
Best,
Doug
On Mon, Feb 13, 2012 at 6:08 AM, <PSalter@aol.com> wrote:
> **
> Does anyone know of a repair, as in seals or modifications, to stop oil
> dripping from my sump drain valve?
>
> What is the process for stopping leaks around the bolt head and nut of the
> rockers? I have in the past, pushed the bolt out with something close to
> the same size as the bolt, to replace crush washers. Is there a simple
> solution?
>
> Thanks
>
> Phil
>
> *
>
> *
>
>
Message 6
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| Subject: | Leaky Oil Sump Valve and Rocker Bolt Leaks |
To be sure of NOT hearing the tinkles of bearings. Get a bolt or rod of the same
diameter as the
rocker bolt and and cut it to slightly shorter than the rocker arm, chamfer the
ends. As you with
draw the rocker bolt insert the tool this will keep the little (x#% *&(&^) bearings
in place as you
remove the rocker arm.
Tom Elliott
CJ-6A NX63727
777 Quartz Ave
PMB 7004
Sandy Valley NV
89019
Cell 702-595-2680
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of
doug sapp
Sent: Monday, February 13, 2012 9:48 AM
Subject: Re: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks
Phil,
We carry the rocker washers in stock. Ours are .003 thicker than stock which adds
a little bit more
material to help out with a persistent leak.
Great care should be taken to make 100% sure that all of the needle bearings are
in fact present and
accounted for. I have seen several engines with missing roller bearings which
will in time result
in abnormal wear and render the cylinder unserviceable.
For those of you who have pushed out the bolt only to hear the sound of scattering
bearings there
are 56 of the little rascals in each bearing point.
Best,
Doug
On Mon, Feb 13, 2012 at 6:08 AM, <PSalter@aol.com> wrote:
Does anyone know of a repair, as in seals or modifications, to stop oil dripping
from my sump drain
valve?
What is the process for stopping leaks around the bolt head and nut of the rockers?
I have in the
past, pushed the bolt out with something close to the same size as the bolt, to
replace crush
washers. Is there a simple solution?
Thanks
Phil
et="_blank">http://www.matronics.com/Navigator?Yak-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
No virus found in this message.
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Message 7
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| Subject: | Leaky rocker arm washers |
I use a orange silicone O-ring in place of the outer crush washers. 13.5mm if I
remember. Has been working fine but be sure the durometer rating of the material
is not too soft and the temp rating is at least 350 degrees F.
Also use the chamfered rod tool to keep them pesky bearings from getting out.
Craig Payne
Message 8
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| Subject: | Re: Leaky rocker arm washers |
Just wait until you have to pull all 18 of those buggers to r&r the cylinders.
Got some tricks for chasing down those pesky 56 roller bearings when they escape.
Just work over a drop cloth and have a good magnet near by because some will
get away. Make sure you plug the valve guide hole if you are going to pull
the rocker assembly. They will get away on some occasion. Best to make sure their
walk about is a short distance and not down some deep dark tube that you are
going to have to pull to trap the wandering bugger with a magnet off the top
of the tappet. Now the tappet assembly is an interesting little affair all to
itself. It too can take a walk about. Grease works wonders in helping those
little buggers behave.
Doc
Sent from my iPad
On Feb 13, 2012, at 8:23 PM, Cpayne <cpayne@joimail.com> wrote:
>
> I use a orange silicone O-ring in place of the outer crush washers. 13.5mm if
I remember. Has been working fine but be sure the durometer rating of the material
is not too soft and the temp rating is at least 350 degrees F.
>
> Also use the chamfered rod tool to keep them pesky bearings from getting out.
>
> Craig Payne
>
>
>
>
Message 9
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Hi all...
anyone no of an official MAUW for the Nanchang?
The reason I ask is that we have just installed the 120 litre bladder tanks
and with 2 people, 240 litres of fuel and, say, 20kg of bags we come out at
about 1530 kg (3366 lb)
When the first CJ came into New Zealand they were unable to find a
published MAUW and chose 1400 kg as this was the cut-off point for the
cheapest landing fees and so forth... nothing to do with the aircraft so to
speak!
Incidentally, to flog a dead horse, after revising the fuel vent system as
per the instructions (inclulding new vent lines from the tanks)
and alternating the collector tank flapper valves from one side to the
other, the blasted thing still feeds from the LH tank first!
Must be the rigging/balance!
Cheers, Jay
New Zealand
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