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1. 08:35 AM - Re: SV: Pitts-List Digest: 0 Msgs - 05/20/09 (Gregg Costabile)
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| Subject: | Re: SV: Pitts-List Digest: 0 Msgs - 05/20/09 |
Hvard,
Don't know if you've made any progress, but you should be wary of any
corrosion indications. Two A&P's on our field changed out the engine in a
Decathlon due to internal corrosion. They estimated it was within three
flight hours of failing when they took it out of service. This particular
airplane was located in a humid, salty environment (coastal town in
Northwest Florida), and was only flown 10 hours in the last 18 months. Lack
of use is a sure way to internally corrode an engine.
If your engine has an oil filter, cut it open, collect the filter element,
place it in a plastic container, and then rinse it in a bath of 100LL. Use
your fingers to extract as much "gunk" out of the element as possible.
Carefully drain off the 100LL until there is remaining soot in the bottom of
the container - kind of like panning for gold. From there, place a magnet
on the external part of the container and "pull" the soot up the side of the
container. You should see very little metal on the inside of the container
in response to the magnet. "Very little" is hard to quantify or visualize
if you've never seen this before, and difficult to describe in words.
Imagine a good "pinch" of pepper added to a recipe in cooking; if there's a
good "pinch" of metal in response to the magnet, be suspicious. If not,
then follow Dave's guidance and have the cooler inspected and cleaned by a
radiator shop.
Best regards,
Gregg C
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