Today's Message Index:
----------------------
1. 05:23 AM - Re: Oil leak 912ULS (Thom Riddle)
2. 05:56 AM - Re: Oil leak 912ULS (Roger Lee)
3. 04:56 PM - Re: Oil leak 912ULS (Peter Thomson)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Oil leak 912ULS |
I had a small nuisance oil leak somewhere in the front of the 912-F3 (1100+ hours)
in my Katana last summer. It was not enough to ground the airplane. The leak
would not appear on full power ground run-up but only after flying. After many
many hours of one-at-a-time removal of everything possible, including gearbox,
inspection, re-installing, and test-flying, I found two leaks. One was the
fuel pump gasket and the other was the oil pressure sending unit joint where
it threads into the oil pump.
The fuel pump gasket, upon inspection did have a bad spot on it and replacing that
stopped that particular leak. I suspect that gasket/spacer was damaged at
some point during service when it is removed to check fuel pump cam in gearbox.
On the oil pressure sending unit, during prior service (before the leak discovery)
I had been careful to re-torque to spec the NPT threaded fitting into the
fuel pump. Apparently the "correct" torque spec is not enough to seal at this
joint, but since that was the only possible source left, I tightened it up about
1/2 turn more and that stopped it. I'd hate to tighten it too much and crack
the oil pump housing $$$$$.
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
no engine
FOR SALE
Diamond Katana DA20-A1
Rotax 912 F3
Don't worry about old age... it doesn't last very long.
- Anonymous
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=394653#394653
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Oil leak 912ULS |
Hi Peter,
If it is on the very front of the engine then and this is a tractor prop then it
isn't a valve cover seep because it won't go to the front of the engine, but
farther back. If it's on the right side it isn't the oil filter. The oil pump
housing rarely leaks, but I wouldn't rule it out totally.
I would clean the engine and then sit for 30 min. and let it run at 4000 rpm on
the ground. The problem with an in flight check is the high pressure air over
the engine tends to spread it too much and make it hard to find. If you still
can't find it spray some foot powder on the front of the engine and any leak
will show up like a red flag.
The most common are:
1. The bottom of the gearbox. It would need removal and re-sealed. It
isn't hard to do.Re-seal it with Loctite 5910 (European) or 598 (US) or
Permatex "The Right Stuff".
2. It it is the older AC or Pierberg fuel pump then it is coming out of the
weep hole on the bottom of the pump and will need a new pump. (very
common) I'll be doing this very thing this morning. A new pump is
$171.
Other less likely are the oil pressure sender that was loose, but if it was tight
to start with probably isn't the issue. Any oil cooler fittings up front, even
if they look clean put a wrench on them or check the hose clamps. The high
pressure air flow pushes it off the fitting towards the back and gives you a
false location.
My money is still on the first two common if this just started to leak and wasn't
before.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=394656#394656
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Oil leak 912ULS |
Many thanks to all who gave a wealth of information on finding this. I WILL
track it down and post result !
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|