I removed my prop the other day to take it up to Northwest Propeller for some edge work. After I got back to the hangar, I decided to take off the flywheel and change the alternator belt. To my surprise, I discovered the two mating surfaces between the flywheel and the crank where stained (see below). The mating surfaces on the other side between the flywheel and prop are clean.
This is off an RV-4 (1992) with about 850 hours on the engine and 300 SOH (2008) on the prop.
While the stains look oily they are not. There is very little build up and they are dry. Any ideas about what is going on?
Thanks,
Scott
This is off an RV-4 (1992) with about 850 hours on the engine and 300 SOH (2008) on the prop.
While the stains look oily they are not. There is very little build up and they are dry. Any ideas about what is going on?
Thanks,
Scott