Paul McBride, an expert on engines, retired after almost 40 years with Lycoming.
Q: I’ve been having trouble with my Lycoming O-360-AIA engine for some time. The oil temperature is running about 200° on a cool day. The head temperature is in med green.
I have completed the following to determine the problem: A few months ago a new temperature control oil cooler by-pass unit was installed; and I checked the oil temperature probe by placing it in boiling water. The instrument in the aircraft read about 200°.
The oil cooler is a Positech with six tubes. The air source is an outside air inlet. I believe that the air flow is enough to cool the oil. I have no way to check. I have asked around the airport for help but this has not been fruitful.
GARY QUESTA, via e-mail
A: Gary, after reading your e-mail, I could hardly get the smile off my face. I don’t quite know how to tell you this, but most Lycoming engine operators would really like to have that kind of oil temperature on their engine.
Let’s look at some of the important things about oil temperature. [Read more…]