912ULS Compression Issue
in 912 / 914 Technical Questions
5 years ago
Hi - I desperately need some advice please.
I bought a Zodiac fitted with a 2003 912ULS with just over 500 hours on the engine a couple of months back.
The main symptom of the problem is when you turn over the prop by hand (when you gurgle to check oil), the prop just turns too easily like there is low compression. It does not "kick" like normal 912ULS engines when you hand turn it over where you clearly feel the compression cycles build up with increased resistance and then accelerate as the compression peaks and then declines before the next "kick" over (apologies for crude description!).
I've check the compressions on each cylinder a few times per the instructions with engine warm, all good per manual. Checked the blow-bys and also seem normal by manual's specs.
The plane stood unused for 4 years and it seems the problems started after that when I bought it (according to the old owner but without witnessing that I can't be 100% sure). The engine seized at 30 hours after an oil pipe broker and was rebuilt, not by approved Rotax agent however.
The only other possible symptom I can give is it seems to use quite a lot of oil (over 100ml / hour as best I can tell), although I've done very few hours in it trying to resolve this issue.
Help!
I bought a Zodiac fitted with a 2003 912ULS with just over 500 hours on the engine a couple of months back.
The main symptom of the problem is when you turn over the prop by hand (when you gurgle to check oil), the prop just turns too easily like there is low compression. It does not "kick" like normal 912ULS engines when you hand turn it over where you clearly feel the compression cycles build up with increased resistance and then accelerate as the compression peaks and then declines before the next "kick" over (apologies for crude description!).
I've check the compressions on each cylinder a few times per the instructions with engine warm, all good per manual. Checked the blow-bys and also seem normal by manual's specs.
The plane stood unused for 4 years and it seems the problems started after that when I bought it (according to the old owner but without witnessing that I can't be 100% sure). The engine seized at 30 hours after an oil pipe broker and was rebuilt, not by approved Rotax agent however.
The only other possible symptom I can give is it seems to use quite a lot of oil (over 100ml / hour as best I can tell), although I've done very few hours in it trying to resolve this issue.
Help!
