Yes, it had compression this morning but still did not act right.
Gotta pull the jug. Oh well!
Thanks for all the advice,
Larry Snyder
Washington, MO
On Aug 9, 2008, at 1:15 PM, Hartmut Beil wrote:
Oh and one more thing:
"Also, when I landed this afternoon, it was hot, and I would get a
backfire when I when from full throttle to idle. What could cause
that?
"
A backfire like that indicates a lean mixture. A lean mixture can
either be produced by your carburetor, but also by leaking valves.
If your exhaust valve leaks, exhaust gases will mix with gases from
the intake. That leans and heats the mixture.
The cylinder is setup for preignition which will backfire through
the still open intake valve.
Hartmut
----- Original Message -----
From: Larry Snyder
To: Ercoupe Tech List
Sent: Saturday, August 09, 2008 2:37 AM
Subject: [ercoupe-tech] Sticking Valve
Dear tech heads,
When we flew up to Wausau, we flew with the engine at about 205
degrees most of the way, but it crept up to 215 briefly on a climb.
When we started the plane up to leave on Sunday, we were running on
only 3 cylinders. After about a minute, though, it cleared up and ran
fine all the way home (it's about 5 1/2 hours each way). I went out a
few nights ago to get night current, and it did the same thing. I went
out today and pulled it through and the last turn showed no
compression. I warmed it up (it ran roughly) and suddenly all was well
again. I stopped the engine and pulled it through and voila -
compression on all 4 cylinders.
I talked to the local mechanic, and he said that I should put Avblend
in the oil and fly for an hour or so to clean up the valve stems and
guides, so I did. I'll go out tomorrow when it's cold and pull it
through again, seeing if the valve is stuck again. If it is, I presume
the guide needs to be reamed?
Is this where the rope is used to keep the valve in place? How does
that work? Or is it better to just pull the jug? I understand that the
valve stem is sticking in the guide, I guess I'm not sure I understand
the logistics of reaming the guide without removing the cylinder.
Also, when I landed this afternoon, it was hot, and I would get a
backfire when I when from full throttle to idle. What could cause
that?
Thanks!
Larry Snyder
N99340
