Today's Message Index:
----------------------
1. 06:16 AM - Re: Key Switch for JAB 3300 (wypaul)
2. 06:37 AM - Re: Re: Key Switch for JAB 3300 ()
3. 06:45 AM - Re: Re: Key Switch for JAB 3300 (Rob Turk)
4. 09:57 AM - Oil Pressure Sending unit location (DanM)
5. 10:24 AM - Re: insufficient rocker chamber greasing ????? (Andy Silvester)
6. 10:28 AM - Re: Oil Pressure Sending unit location (Rob Turk)
7. 11:51 AM - Re: Oil Pressure Sending unit location (Andy Silvester)
8. 11:54 AM - Re: Key Switch for JAB 3300 (DanM)
9. 12:46 PM - Re: Oil Pressure Sending unit location (Rob Turk)
Message 1
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| Subject: | Re: Key Switch for JAB 3300 |
I used the ACS switch from Aircraft Spruce, but if I were doing it today I would
just use toggle switches and a push-button. They are lighter, available anywhere
and cheaper.
Paul Spackman
Q-2 3300 Jabiru
--------
Paul Spackman
Q-2 Jabiru 3300
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=129933#129933
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| Subject: | Re: Key Switch for JAB 3300 |
I'm not flying my CH601XL yet but I second that suggestion. I went with an aircraft
type key switch "Off, Right, Left, Both, Start" from ACS but if I were doing
it again, I would use two toggle switches for the right and left mag and a
start button. One obvious benefit is that when you are doing maintenance or daignostics,
you can spin the engine with the starter while the mag switches are
off. The key won't allow that.
Dred
---- wypaul <loadout@bresnan.net> wrote:
>
> I used the ACS switch from Aircraft Spruce, but if I were doing it today I would
just use toggle switches and a push-button. They are lighter, available anywhere
and cheaper.
>
> Paul Spackman
> Q-2 3300 Jabiru
>
> --------
> Paul Spackman
> Q-2 Jabiru 3300
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=129933#129933
>
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: Key Switch for JAB 3300 |
Same here. The ACS switch does OK but is heavy and has some drawbacks.
The main drawback is that you can not run the starter engine for a few turns
with the magneto's off.
Rob
----- Original Message -----
From: "wypaul" <loadout@bresnan.net>
Sent: Monday, August 20, 2007 3:13 PM
Subject: JabiruEngine-List: Re: Key Switch for JAB 3300
>
> I used the ACS switch from Aircraft Spruce, but if I were doing it today I
> would just use toggle switches and a push-button. They are lighter,
> available anywhere and cheaper.
>
> Paul Spackman
> Q-2 3300 Jabiru
>
> --------
> Paul Spackman
> Q-2 Jabiru 3300
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| Subject: | Oil Pressure Sending unit location |
Can the oil pressure sending unit be located on the lower port. My new sending
unit is larger diameter than the factory unti and won't fit in the regular location.
Attached photos show standard location and the plug port I want to use.
Thanks in advance
--------
Dan Mc Intyre
Kitfox Model IV, Jab 2200
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=129969#129969
Attachments:
http://forums.matronics.com//files/p6020013_153.jpg
Message 5
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| Subject: | insufficient rocker chamber greasing ????? |
Martin,
Thanks for the information - I find it very interesting. However, as a Jabiru dealer
having sold several hundred engines over the years I can't tell you it's
a problem I have either personally experienced, or had heard about from others
until now. It's true to say there are probably a greater number of tri-gear
Jabiru-engined airplanes out there, but equally true that there are a significant
number of taildraggers too. I'm sure your observations are correct for your
installation, but in my experience we don't see higher valve guide or rocker
bearing wear in heads at the front of taildragger installations. So we must assume
that the stem and bearings retain sufficient lubrication both before and
after flight.
However, we are educated by your posting and will look for particular signs or
trends in future. Thanks again.
Andy Silvester
Suncoast Sportplanes, Inc.
39248 South Ave, Zephyrhills, FL 33542
Tel: (813) 779 2324 Fax: (813) 779 2246
www.suncoastjabiru.com
-----Original Message-----
From: owner-jabiruengine-list-server@matronics.com [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of avidflyer01
Sent: Sunday, August 19, 2007 1:36 PM
Subject: JabiruEngine-List: insufficient rocker chamber greasing ?????
hi guys, I would like to share some very worrying facts about my engine (2200 w/hyd
lifters) and maybe get some answers from those who have already been there.
I have just completed reassembling my engine after replacement of all valve guides
(both of N2 were completely worn out at 100hrs, others were replaced as precaution).
Today I started it and run for 5 min at 1200-1500rpm, then stopped
and made a close inspection. When I removed tapper covers, I discovered there
was some oil, as it should be the case, in rear rocker chambers (Ns 3 and 4)
but the forward ones were AS DRY AS PRIOR TO ASSEMBLY.
The airplane was sitting almost level, with tail slightly lower, maybe 5. Oil level
was slightly above minimum, as per SB 013-1. The oil pressure was (as always
both in flight and at idle) at 35psi.
After checking that the T junctions on oil feed line were not blocked and some
more thinking, I tilted the airplane more on the nose (3 nose down), cleaned rocker
chambers and run it again for 1 min at 1200rpm.
This time forward rocker chambers were correctly flooded with oil while the aft
ones were virtually dry, except a few drops.
I sincerely hope that at a higher power setting the amount of oil carried thru
the feed tube from under the cylinders is sufficient to spread it correctly in
the T-junction to grease both rocker chambers (I have so far always seen oil
in rocker chambers, although there was always more of it in the rear ones my
plane is a taildragger).
But the worrying truth seems to be that when warming the engine or taxiing at
low rews (and even more so in a taildragger, although already 5 tilt seems to
make a difference), there are good chances that fwd cylinder rockers and valve
guides run dry!!!! My guess is that the quantity of oil delivered is insufficient
and it only runs down the slope, towards the cylinder that is lower.
This could be by the way one of the possible explanations why my valve guides were
ruined after 100hrs and that my rocker bushings also show some premature wear.
Has anybody any comment on these facts? Pete, Andy, do you guys consider it normal
that the whole rocker chamber is not bathing in oil????? Any similar problems
found/cured????
Once at that subject, the SB 013-1 explained to us that vent holes and correct
routing of the sump breather were supposed to enhance the return of oil from rocker
chambers back to the sump, as if too much oil was delivered to the heads.
Seemingly, I have the opposite problem (or at least I do have it on lower revs)
isnt there a restriction between the main oil galley and the two tubes feeding
oil to rocker chambers, that could be increased????
I dont like the idea of running idle with no oil in my rockers/valves.
Any input, guys????
Martin
Avid flyer w/Jab 2200
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=129820#129820
Message 6
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| Subject: | Re: Oil Pressure Sending unit location |
>From what I understand you can place it at some other place in the oil
circuit but your pressure reading will be a bit too optimistic. The factory
oil sender is located just before the oil pump, where the oil pressure is
the lowest in the chain. If you can, run both the original sender and the
new sender side by side and see what the difference is.
Rob
----- Original Message -----
From: "DanM" <danm@gangnailtruss.com>
Sent: Monday, August 20, 2007 6:54 PM
Subject: JabiruEngine-List: Oil Pressure Sending unit location
>
> Can the oil pressure sending unit be located on the lower port. My new
> sending unit is larger diameter than the factory unti and won't fit in the
> regular location. Attached photos show standard location and the plug port
> I want to use.
>
> Thanks in advance
>
> --------
> Dan Mc Intyre
Message 7
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| Subject: | Oil Pressure Sending unit location |
Martin,
Rob's almost right, but the standard position for the sender is right AFTER
the pump, so it'll measure higher than the lower position, which despite it
being only just below the sender, is actually at the other end of the oil
system. Between the two points are the oil cooler and filter, but the
'lower' point is the gallery supplying the bearings etc. My preference would
be to put the sender at the lower point, but this would have the sender
possibly interfering with the prop flange or other forward parts as it would
stand-out in front of the engine. If you can get a sender into the lower
point, by all means use it.
Andy
Suncoast Sportplanes, Inc.
39248 South Ave, Zephyrhills, FL 33542
Tel: (813) 779 2324 Fax: (813) 779 2246
www.suncoastjabiru.com
-----Original Message-----
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Rob Turk
Sent: Monday, August 20, 2007 2:27 PM
Subject: Re: JabiruEngine-List: Oil Pressure Sending unit location
>From what I understand you can place it at some other place in the oil
circuit but your pressure reading will be a bit too optimistic. The factory
oil sender is located just before the oil pump, where the oil pressure is
the lowest in the chain. If you can, run both the original sender and the
new sender side by side and see what the difference is.
Rob
----- Original Message -----
From: "DanM" <danm@gangnailtruss.com>
Sent: Monday, August 20, 2007 6:54 PM
Subject: JabiruEngine-List: Oil Pressure Sending unit location
>
> Can the oil pressure sending unit be located on the lower port. My new
> sending unit is larger diameter than the factory unti and won't fit in the
> regular location. Attached photos show standard location and the plug port
> I want to use.
>
> Thanks in advance
>
> --------
> Dan Mc Intyre
Message 8
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| Subject: | Re: Key Switch for JAB 3300 |
I used a ASC switch also, but I bought the switch that is a off, left & right only
model ,no start. I use a push button to start. This set up let me crank the
engine with the mags off.
--------
Dan Mc Intyre
Kitfox Model IV, Jab 2200
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=129986#129986
Message 9
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| Subject: | Re: Oil Pressure Sending unit location |
Hi Andy,
I just checked the drawings and it appears we're both wrong.. Looking at
page 93 of the inspection and maintenance manual (drawing 9493013-1), it
shows that oil from the oil pump goes to the 'donut' adapter, from there
through the oil cooler, then through the oil filter, and then into the oil
gallery. The pressure sensor sits right at the exit of the oil filter, but
before the oil gallery.
We have a bit low oil pressure reading when the run-in oil is hot, and we
connected a secondary sensor to the line feeding the oil cooler using a 'T'
adapter. Pressure reads about 5 psi higher than the original sensor.
----- Original Message -----
From: "Andy Silvester" <andy@suncoastjabiru.com>
Sent: Monday, August 20, 2007 8:47 PM
Subject: RE: JabiruEngine-List: Oil Pressure Sending unit location
> <andy@suncoastjabiru.com>
>
> Martin,
>
> Rob's almost right, but the standard position for the sender is right
> AFTER
> the pump, so it'll measure higher than the lower position, which despite
> it
> being only just below the sender, is actually at the other end of the oil
> system. Between the two points are the oil cooler and filter, but the
> 'lower' point is the gallery supplying the bearings etc. My preference
> would
> be to put the sender at the lower point, but this would have the sender
> possibly interfering with the prop flange or other forward parts as it
> would
> stand-out in front of the engine. If you can get a sender into the lower
> point, by all means use it.
>
> Andy
> Suncoast Sportplanes, Inc.
> 39248 South Ave, Zephyrhills, FL 33542
> Tel: (813) 779 2324 Fax: (813) 779 2246
> www.suncoastjabiru.com
>
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