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Walter gave me a very thorough lesson in compression testing. I thought
others on this list might benefit from his explanation.
After adding oil, the readings went up in all my cylinders, to almost 200.
But #2 leaked down, though more slowly. I think the consensus is I have a
burned valve.
Now, does anyone have a way to fix it without removing the head?
Ray
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Date: Fri, 09 Jul 99 19:18:24 Central Daylight Time
From: walter menge <walter.menge@gte.net>
To: JRLNJ <JRLNJ@aol.com>
Subject: RE: Compression testing Questions
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Hi. I would think you have a bad valve. You could have bad rings. It is
possible to run the engine and reach
operating temperature and take a compression test. I had rather all cylinders
be evon with very little
vareation. With one low, as you have indicated, could indicate a valve or ring
problem. Squirt some oil in the
low cylinder and take another reading. Higher reading indicates the oil sealed
the rings and they are bad. No
increase indicates the valves are burnt. If compression is low on two ajacent
cylinders, The head gasket
probably is blown between the two. With radiator full and engine running and
bubles in the radiator indicates
blown head gasket from a cylinder to the water jacket. A cylinders at top dead
center on compression stroke
with air injected in the spark plug hole will try to turn the engine over or
air will escape the exhaust or the
carburetor. Burnt exhaust valve lets air escape tkrpugh the exhaust and burnt
intake valve lets air escape
through the carburetor. I feel this will shed some light on compression tests
and blown head gaskets. If there
are any questions please let me know. Walter.Menge@gte.net
You may send to mgs list if you feel that it will help them.[delete this line
if you do.]
--------
>From: JRLNJ@aol.com
>To: walter.menge@gte.net
>Subject: RE: Compression testing Questions
>Date: July 03, 1999
>
>I did a compression test on the 76 B I'm working on... (the comp gauge is an
>old, cheap one, so accuracy is probably +or- ?)...I got 150lbs from three
>cylinders, and less than 138 in the number two; but this low cylinder
>immediately leaked down to nothing.
>(This car has about 75,000 miles on it, has been sitting a long time.)
>So, do I need a new head gasket?
> Or is this much worse?
>
>Thanks,
>Ray
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