Joined: 26 Oct 2007
Location: N. Richland Hills, TX
|Posted: Sat Oct 29, 2016 4:05 am Post subject: oil leak at stud on prop governor mount
I have an O-360-A1F6D engine on my RV-8. In early summer the engine developed an oil leak. We finally narrowed the source down to the prop governor area and changed gaskets a couple of times but the leak continued. I even had the governor bench tested at Byam Propeller Service in Fort Worth, TX but the governor itself was not leaking. BTW the people at Byam are fantastic.
My mechanic decided that maybe we had a leak along a stud and upon inspection found the lower outboard stud was a little loose, and when he removed the stud he found that the stud was not in a blind hole but was partly exposed to the oil in the accessory case and maybe in the flow of the oil return line!
We pulled the stud out and it was clean with no sealant of any kind. Normally I would expect a stud to be put in with at least Loctite.
1) Should the stud be open to the return flow and oil in the accessory case?
2) What sealant/thread lock should we install the stud with?
Remember this is a dual mag engine and the governor mounting pad is integral with the accessory case. Non-dual mag engines have a separate adapter.
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