(PaulaJay1) wrote in message ...
In article ,
(Robert M. Gary) writes:

IO-360-A3B6
SFNEW 682
At each 50 hours change I've had...
7, 10, 25, 13 (short sample), 24, 23 ppm

I don't think I have an alumimum dip stick (at least my A&P says I
don't). I'm not finding anything in the filter.

I'm in California so everything is pretty pricey. Should I spend a
grand or so having the cylinders boroscoped?


Robert,
The IO360 in my Archer has about the same hours and the last three readings
have been 14, 10, 12 for the Al. Cleve Tech Center ( and my A&P) say that is
OK. Yours is a little higher but if the "experts" say OK the watchfull waiting
seems to be in order. The Troubleshooting Guide from Cleve Tech suggests less
than 10 and the sources can be from "Bushings, Some Bearings, Pistons, Turbo
Charger, Compressor Wheels". Seems to me (no expert) that the borscope would
not answer your question anyway.

LOL and keep watching.

Chuck

There have been several ADs against the aluminum piston pin plugs in
Lycomings. Many mechanics are in the habit of ignoring ADs, and the
disintegrating plugs go on falling apart until the pin hits the
cylinder and grooves it. It might be wise to do an AD search to see
where your airplane might be behind.

Dan