Al just a quick note from an A&P.. Leakeage from an intake valve is not
considerd to be fatal since the incoming fuel will cool the valve, leakaage
past the rings will burn oil and increase crankcase pressure, but a leaking
exhaust valve will continue to destroy the valve since the hot gas will
continue to errode the valve face.. Thats why most mechanics will pull a
cylinder if an exhaust valve is leaking during a compression test . We have
your safety uppermost in mind , losing a exhuast valve in flight would spoil
just about anybody's day. By the way, all compression testers have a calibrated
orrifice.
Tom A&P/IA Couper3938H
DeMarzo <[EMAIL PROTECTED]> wrote:
Oh man! You using Sal for the cylinders?
Your mechanic should have a calibrated orifice to check compressions.
Continental says that compressions to 40 should be okay and that the combustion
chambers and valves should be checked with a borescope when they're low. Any
good A&P and all A&P's with IA should have a borescope.
Are you using TCP in your gas?
Al DeMarzo
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----- Original Message -----
From: heavensounds
To: [email protected]
Sent: Saturday, May 03, 2008 9:26 PM
Subject: [ercoupe-tech] Grounded
Started my annual today. Checking compressions... 79 ! , 79 ! , 79 ! ,
and ... (drum roll)
59 and the noise of air escaping through the exhaust. : - (
Tried staking the exhaust valve. No success. Had to pull the jug. Called the
guy who overhauled them 1 1/2 years ago and he said to bring it over (Saturday
afternoon), that it probably was a stuck exhaust valve and it should be ready
Monday afternoon. Can't complain about his response!!
Another sour note is that we pulled a helicoil out on another cylinder when
pulling out the spark plug. Something else to deal with.
Well, as I used to tell my son: "Patience is the mother of happiness" Now
It's my turn to apply it.
Eliacim
.
