912ULS 900 hrs TT
After sitting in the hanger for several days, before I fly, I pull the prop through several times and burp the oil tank before I start the engine and go fly. I have recently noticed one weak cylinder when pulling it through. It starts okay, has full power on take off, no vibrations or roughness, no noises, and seems to run as well as it always has.
On landing there is NO weak cylinder pulling the prop through several rotations. The cylinder is still good the next day, but then gets weak again after several days.
I can only think of a hydraulic lifter bleeding down. Have not pulled any valve covers or done a compression test yet, just trying to figure what it could be before I really get to looking.
Is there any history of the lifters giving out (900 hrs time). I can't remember any posts on this forum about such a problem
Dale
After sitting in the hanger for several days, before I fly, I pull the prop through several times and burp the oil tank before I start the engine and go fly. I have recently noticed one weak cylinder when pulling it through. It starts okay, has full power on take off, no vibrations or roughness, no noises, and seems to run as well as it always has.
On landing there is NO weak cylinder pulling the prop through several rotations. The cylinder is still good the next day, but then gets weak again after several days.
I can only think of a hydraulic lifter bleeding down. Have not pulled any valve covers or done a compression test yet, just trying to figure what it could be before I really get to looking.
Is there any history of the lifters giving out (900 hrs time). I can't remember any posts on this forum about such a problem
Dale
