fbpx
Login

 

Jump to Forum..

Bad oil scraper ring fix??

in 912iS Technical Questions 3 weeks ago

My 912is has been burning a small amount of oil from the #1 cylinder for a few flights now. It's not enough to show any decrease in oil quantity after a less than one hour flight but it is enough that it is expelling some burnt oil from the exhaust fitting on the cylinder. A differential pressure test today showed no leakage however a horoscope through the upper spark plug hole showed enough oil in the cylinder to give me another reason to think I have a bad oil scraper ring.

Wondering if anyone has ever tried the AUTOMOTIVE technique of letting some B-12 Chemtool sit in the cylinder to attempt to remove a carbon deposit that COULD be causing the burnt oil. IF, IF, I do this I would remove the remaining chemtool before starting the engine and change the oil right after allowing the engine to idle (as Berryman recommends) but I am still hesitant to try this procedure.

  • Re: Bad oil scraper ring fix??

    by » 3 weeks ago

    I saw your post on the 912/914 forum but thought I would post here since yours it the 912is. I had a similar problem with my first 912 UL engine which had just less than 1000 hours on it. For years it used no oil between services and then it started to increase to the point where it was consistently using about 60ml per hour.

    Due to another problem with the engine (failed inlet valve) the engine was stripped and rebuilt. The oil scraper rings all needed replacing. The spring that sits in the back of the ring had worn small grooves in the ring creating a mini ratchet. This prevent the ring from expanding any further to take up any wear.

    Sadly, I had the rings replaced and the oil consumption was worse and never settled. I had the engine completely rebuilt again but in the end I replaced the engine.

    I’m not sure that any of this helps you, but you could just remove the cylinder in question and inspect the ring directly. It’s not too difficult to do.

      
    Report

  • Re: Bad oil scraper ring fix??

    by » 3 weeks ago

    Thanks Kevin.

    Yeah that is my plan. I'm already having $$ nightmares!

      
    Report
You do not have permissions to reply to this topic.
Related Topics
Title Category Replies
MCR oil additive 912 / 914 Technical Questions 3
Misfiring Over 3/4 Throttle During Cruise 912 / 914 Technical Questions 5
Bad oil scraper ring - fix? 912iS Technical Questions 4
Some questions about oil filters and oil 912 / 914 Technical Questions 9
Gearbox Oil Plug Safety Wire Loc? 912 / 914 Technical Questions 5
Follow Us

Safety First!

 

To receive critical-to-safety information on your ROTAX Engine, please subscribe to
ROTAX-OWNER.COM

Recent Videos

Login