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1. 06:46 AM - Re: Fuel in oil 912ULS (Roger Lee)
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| Subject: | Re: Fuel in oil 912ULS |
Hi Peter,
Kev and Ira both make good points. I get an oil analysis done at each oil change
and never have fuel trace in the oil. I will see if I can't post one of my analysis
a little later. Doing an analysis every 100 hrs. or the annual is good.
Getting the oil temps up does keep impurities cooked out of the oil. The thermostats
only go to 180 degrees. Many people use a 2" strip of aluminum tape to
accomplish the same thing over the radiator, but you can tailor it to your needs
if you need more temp or less. Shoot for at least 212-220. I do a compression
test and carb balance every 100 hrs or annual on my plane and every plane
that comes through my shop. Doesn't make any difference what the manual says
here for me. It only takes about 20 minutes on a hot engine for a compression
test. I do it right after the carb balance because the engine is still hot. Never
do a compression check on a cold 912. Test pressure is 87 psi and not 80 like
I see test coming from A&P's. Typical test results are 87 test and 83-85 psi
differential.
The other thing believe it or not that will contribute to this issue is out of
sync carbs that never get balanced. (I won't get into the full explanation here)
The engine just shakes too much, even if you can't feel it, and causes a host
of issues over time. Do this every 100 hrs. or every annual. Carb balance is
extremely important for your engine. You should be keeping on top of carb rebuilds
too. Waiting 800 hrs. is not good.
Between better oil temps, compression test and carb care you will have a good handle
on what the engine is doing and have a healthier engine.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
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http://forums.matronics.com/viewtopic.php?p=252638#252638
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