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Engine should always be warm, and the closer to operating temp the
better,,,,this is because your working with several different type of metal (
rings, pistons, block, heads, valves) all of which have different expansion
rates when heated,,, test should be done with pistons as close to TDC as you can
because this will be where the most wear in the cylinder is, and no,,,,,,, I
would never reuse the rings,,,,,,, just my 2 cents
In a message dated 3/31/2013 7:50:21 A.M. Central Daylight Time,
dongallimore@xxxxxxx writes:
Partially ran a leak down and compression test on a my 440
yesterday. Engine was
not warm, just room temperature of about 60
degrees.(Does that matter?)
Compression on 4 cylinders (1,3,5,7) was
around 180 psi (9.5-1 engine) but
rapidly fell off once I stopped turning
the engine. Leak down was 85% for
cylinder 1 and about 45% on 8, 4 &
3. (Had to quit for dinner while trying to do
#6 which is tough to do due
to clearances) Based on the sound, the air is
leaking past the
rings, not the valves. Since 1 and 3 were tested both ways, not
thinking
head gasket.
So, I think I need to rering the engine.
If I need
to rering, can I hone the engine while it's in the car with the crank
in
place or is there too much grit generated and I'm pushing it. Can I reuse the
rings? I suspect the problem is a result of gas washing the oil off
the walls
since I've had a few heavy fuel discharges from the carb - stuck
floats due to
my fault of putting the carb together incorrectly
Akron Don Gallimore
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