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912 Oil Leak

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professor71(at)HOTMAIL.CO
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Posted: Mon Dec 04, 2006 8:56 pm Post subject: 912 Oil Leak

Hi List

I have a very small oil leak on a 912 (200hrs) which is aggravating the heck 

out of me. After flying I have a little oil showing up around the fuel pump, 

around the gear box and blowing back on the battery box on the firewall. I 

just can't seem to find the leak. Oil pressure is fine. Any ideas anyone??

Thanks

John



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zodieman

Joined: 29 Nov 2006
Posts: 17

Posted: Tue Dec 05, 2006 5:49 am Post subject: 912 Oil Leak

Perhaps a bad seal on the PTO? Have you checked the gasket on the fuel pump housing? The fuel pump is driven by the gearbox so maybe you have a leak there.. Trev Page

C-IDUS 601HD R912

 



On Dec 4, 2006, at 11:55 PM, john H wrote:

[quote]--> Zenith-List message posted by: "john H" <professor71(at)hotmail.com (professor71(at)hotmail.com)>

Hi List

I have a very small oil leak on a 912 (200hrs) which is aggravating the heck out of me. After flying I have a little oil showing up around the fuel pump, around the gear box and blowing back on the battery box on the firewall. I just can't seem to find the leak. Oil pressure is fine. Any ideas anyone??

Thanks

John

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cgbrt(at)mondenet.com
Guest

Posted: Tue Dec 05, 2006 5:54 am Post subject: 912 Oil Leak

Hi John,

Had a simmilar problem and traced it to the fuel pump gasket/spacer. A dab

of hi temp sealer solved the problem.

Carl 701 912 with 450 hrs.

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planejim(at)bellsouth.net
Guest

Posted: Sun Dec 10, 2006 6:10 am Post subject: 912 Oil Leak

John,



There are several possible sources for the oil leak on your 912. Earlier 

this year I removed my gearbox and sent it to Lockwood for overhaul ( 500 

hours as suggested by Phil Lockwood ) and had a minor leak when I 

reinstalled the gearbox. It uses a sealant not a gasket at the mating 

surface. I tried just retorqueing the bolts but that didn't fix it. Be 

carefull not to overtorque the bolts. I had to remove it, clean up the 

mating surfaces and reinstall it with more and better applied sealant ( 

$10.00 per tube - one application ). I had also removed the fuel pump, it 

has a gasket under it - just make sure the nuts are tight. The most 

expensive potential source of your leak would be the prop shaft bearing seal 

in the front end of the gearbox. That would require complete disassembly of 

the gearbox after removing it from the engine.



You might give Phil, Kerry or Shane at Lockwood a call and see if they have 

any suggestions on how to isolate the source of the leak.



Jim Hoak 601HD - 912UL - 535 hrs

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