***Ian,Just where did you have the restriction, and how did you find it?
Also how did you fix it?
If your oil is too hot it can be either not enough air or not enough
oil flow.
I have an O-320 Lycosaurus, with a pressure/temp bypass valve, which is
used to contro the flow for an external filter if installed. As I
understand it, it is to prevent loss of flow if there is a restriction
due to the filter plugging. I have the external oil cooler in series
with the filter. This valve was full of gunk, so the valve didn't
always open fully when the temp rose. Sometimes it would and sometimes
not!! Hard to find an intermittent fault. I found it when I took it off
and set it in a pot of water on the stove and watched it's action as the
water reached the boiling point. VOILA!!! Problem identified, and
cleaning it out solved the problem. Seems when I had the engine
'ZEROED' normally this valve is replaced due to worn seats, but this one
had perfect seats so it was cleaned and replaced. But the cleaning
didn't get to the gunk UNDER the temp sensing bulb.
Working fine now, just enjoying flying. Getting to feel like I trust my
machine, which is good.
Just got back from buzzing my buddy's place where there is a party for
his 60th and my 70th. Getting old but not stopping!!!
Enjoy,
Phil.
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