Today's Message Index:
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1. 06:24 AM - 914 Fuel Press (h&jeuropa)
2. 08:47 AM - Re: 914 Fuel Press (Kevin Klinefelter)
3. 09:40 AM - Re: 914 Fuel Press (rparigoris)
4. 05:43 PM - maintenance intervals and paperwork (Roger Lee)
5. 05:47 PM - Rotax Line maint. check list (Roger Lee)
6. 05:51 PM - Magnetic oil plug check and 5 year rubber part replacement (Roger Lee)
Message 1
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On the 914 installed in our Europa we have a differential pressure gauge connected
to the airbox and the fuel supply to measure fuel pressure as specified by
Rotax. It has worked fine for over 150 hours. During the last 10 to 20 hours
we notice the pressure varies during flight. It is nominally 3.5 psi as it
should be but will increase up to 4.0 and decrease back to 3.3 or so. The change
takes place over a few minutes and continues through the flight. The engine
continues to run fine and all temperatures are consistent. The spark plugs
look fine and all look the same.
With our Condition Inspection coming up we're curious if anyone has any ideas of
things to check.
Jim & Heather
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306924#306924
Message 2
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| Subject: | Re: 914 Fuel Press |
Have you checked your fuel filter? Have you tried changing from main to
reserve?
Mine stays pretty consistent, changing with power setting.
Kevin, 914 with 220 hrs
----- Original Message -----
From: "h&jeuropa" <butcher43@att.net>
Sent: Saturday, July 31, 2010 6:24 AM
Subject: RotaxEngines-List: 914 Fuel Press
> <butcher43@att.net>
>
> On the 914 installed in our Europa we have a differential pressure gauge
> connected to the airbox and the fuel supply to measure fuel pressure as
> specified by Rotax. It has worked fine for over 150 hours. During the
> last 10 to 20 hours we notice the pressure varies during flight. It is
> nominally 3.5 psi as it should be but will increase up to 4.0 and decrease
> back to 3.3 or so. The change takes place over a few minutes and
> continues through the flight. The engine continues to run fine and all
> temperatures are consistent. The spark plugs look fine and all look the
> same.
>
> With our Condition Inspection coming up we're curious if anyone has any
> ideas of things to check.
>
> Jim & Heather
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=306924#306924
>
>
>
Message 3
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| Subject: | Re: 914 Fuel Press |
Hi Jim
Differential pressure really won't have very much effect on mixture unless you
are so low jets begin to suck air because fuel is not covering them or so high
that pressure overcomes ability of needle valve to hold it back.
Rotax says between ~ 2 and 5 PSI over airbox is enough to overcome but not over
do it. On the high side many folks with parallel pumps blow right over the high
side when both pumps are switched on with out too much of a problem.
Can't speak from first hand experience, but if something changes it is worth a
look into.
Here are some ideas:
**Gauge that is speaking with forked tongue. First off make sure senders have a
good ground, running a ground specific wire to senders is a good idea in my book.
There is always the chance that a sender has become irregular. Remember you
have some very old gas in the line going to the fuel transducer. If it is mogas
it could gum up. I plan to first fill this line and purge air from it using
100LL which is more better for not gumming things. May be worth a call to UMA
to see if there is a cleaning procedure for sender and clean it, then purge
it and run a ground specific wire from it.
**Perhaps there really is fluctuation happening. Go over vacuum/pressure lines
with a fine tooth comb, a small leak here could be doing you in, pinched hose
same problem.
**For hahas make sure your fuel tank vent is clear
**Make sure your fuel filters or gasculators are clean and there are no leaks.
Leak could allow air to get sucked in
**Perhaps you imported some dog hair from Bob H. and it is clogging toe fuel outlet
on tank? Does it happen on main and reserve? report back
**Make sure you have a good ground going to your instrument
**You didn't mention if pump 1, pump 2 or both pump one and two changes things,
report back
**If sender/transducer is working perfectly, gauge is working perfectly and plumbing
is in order, it could always be the fuel pressure regulator. There is an
adjustment on it, you could fool one way and the other a little bit and see if
it helps. You may want to check with Bud or Lockwood to see if there is any
magic goop to run through it if you use a lot of mogas
**You still may have a plumbing leak, worth it to replace float bowl gaskets especial
if you dropped float bowls to clean in there. There are other carb components
that could have a potential leak going on but I think following through
on above is a good place to start.
I would be alot more worried if you see pressure hitting the low end.
Perhaps you could borrow a fuel pressure regulator for testing?
I think you just had a pump burn out on you, again try both pumps, perhaps the
new pump is a bit flaky? There is a break in, did you fly it at least half a dozen
hours? Perhaps there isn't full voltage going to pump because of a high resistance
connection?
Good luck
Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306961#306961
Message 4
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| Subject: | maintenance intervals and paperwork |
Hi All,
Here is list of the maintenance intervals and associated mandatory paperwork if
you fly an SLSA and should be followed even if you fly an experimental.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306990#306990
Attachments:
http://forums.matronics.com//files/rotax_line_maint_paperwork_594.pdf
http://forums.matronics.com//files/rotax_line_maint_intervals_853.pdf
Message 5
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| Subject: | Rotax Line maint. check list |
Here is a copy of the Rotax line maint. check list. You or your mechanic should
use this every inspection and keep them as a running record for any changes.
It makes sure you check every thing you should and will help from over looking
a problem. Keeping these kinds of records will keep your resale value up. In
the SLSA world of $120K airplanes, poor paperwork will cost you $5K-$10K in resale
value.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306992#306992
Attachments:
http://forums.matronics.com//files/new_rotax_line_maint_manual_146.pdf
Message 6
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| Subject: | Magnetic oil plug check and 5 year rubber part replacement |
Here is a page out of the Rotax manual on what your magnetic oil plug should look
like or not and it is a mandatory check at every oil change.
Here is what needs to be changed on the Rotax 5 year rubber parts replacement.
If you fly an SLSA then these are mandatory, but if you fly an experimental your
not forced to, but it isn't in your best interest to let either of the above
go.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306993#306993
Attachments:
http://forums.matronics.com//files/rotax_5_year_rubber_component_change_747.pdf
http://forums.matronics.com//files/rotax_magnetic_plug_check_187.pdf
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