My prop governor was leaking a tiny drip of oil every few days. This was prior to my running the engine. I have Hartzell's S-1-79 governor. I removed the governor head (model 102889 Rev. 6) and found the below. You can see that the o-ring apparently was pinched when installed. I spoke to a Hartzell A&P and he thought it happened during assembly at the plant and was the first time he'd seen this.
The o-ring part number is C-3317-035 with a 2016 list price of $2.70. The replacement part was covered under warranty.
The damaged ring on the left and the new ring on the right.
When replacing the ring, I learned that it's important to lubricate it with oil and to stretch it in place not roll it. It's trivial to reinstall. The 9/32" hex cap head screws must be torqued to 21-25 in-lbs per the manual (HC-SL-61-277 Rev. 3 D(1)(b)g).
Then I needed to be sure the speeder compress spring sits properly when reassembling. Left image is of course incorrect, whilst the right is correct.
Then I needed to be sure the speeder compress spring sits properly when reassembling. Left image is of course incorrect, whilst the right is correct.
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