Rotax 912 ULS wont rotate by hand

by Jeff Burnette in 912 / 914 Technical Questions 8 years ago

I just bought a 2007 rotax 912 with emaculate records. Last service date was May 2016. It has sat in my garage for 6 months pending install on airplane. Got it mounted last night. Out of curiosity I tried to rotate the engine counter clockwise with some leverage by the prop hub. Moved stiff 1/16th of a turn and then stops hard even with plugs out. I don't want to force anything so I am asking for ideas. Hydrolic lock, clutch, Must be full of oil?

Thanks

Re: Rotax 912 ULS wont rotate by hand

by Kevin Stewart » 8 years ago

Kevin Stewart

5 184 0

Unlikely I know but has someone left the locking pin in place?

Failing that I would suspect that one of the inductive pick-ups might be impeding the flywheel. Just remove the plastic cover on the back of the engine and have a close inspection with a torch.

Kevin

Report
Re: Rotax 912 ULS wont rotate by hand

by Rob Seaton » 8 years ago

Rob Seaton

3 1.32k 251

The carbon deposits on your pistons may have dried out, flaked off, and fell to the bottom of the cylinder. this WILL stop the piston when turning by hand. Don't laugh; we had one such situation a month ago. Try removing the plugs, make sure intake valve is closed, and blow out contamination with shop air.

Report
Re: Rotax 912 ULS wont rotate by hand

by Glenn Dugger » 8 years ago

Glenn Dugger

4 20 3

I'd use a borescope to check things before I got too excited.

Report

You do not have permissions to reply to this topic.

Title	Category	Replies
912 ignition troubleshooting	912 / 914 Technical Questions	1
Rotax fuel pressure sensor 664365 in Garmin G3X GDU460	915iS Technical Questions	0
Seeking Advice on MAP and RPM Limits for Rotax 912ULS (Post-SB-912-079)	912 / 914 Technical Questions	2
912ULS Exhaust Spring Tension	912 / 914 Technical Questions	6
912 air filters replacement	912 / 914 Technical Questions	1

Rotax 912 ULS wont rotate by hand

Recent Videos

Safety First!

Prize Giveaway!

Log In/Out

Login