Good show. When I found a low cylinder, I always put compressed air into
the spark plug hole of a low cylinder with an air-tight fitting (usually an
air line fitting brazed to the body of an old spark plug), made sure the
piston was on TDC (ready to fire), turned the air on and listened at the
intake manifold port and exhaust manifold port for any air leak with a
medical stethoscope. Air in the manifold(s) indicated a valve problem of
some sort. Also looked in the radiator for bubbles indicating a possible
head gasket leak.
On low cylinders, put a couple of squirts of oil in the low cylinder and run
the compression test again. If the reading comes up significantly, probably
worn or cracked piston rings (the oil seals the lead temporarily).
Many mechanics may have a better system than mine. Heck I graduated from
the Ford School in Flint, Michigan way back in 1958.
God I miss that stuff!!!
Denver Farley
Southeast Virginia, USA
-----Original Message-----
From: Muttguru@aol.com [mailto:Muttguru@aol.com]
Sent: Friday, January 26, 2001 2:39 PM
To: denver.farley@monroe.army.mil; mil-veh@uller.skylee.com;
mil-veh@mil-veh.org
Subject: Re: [MV] M 151 A2 Engine -testing before buying
In a message dated 26/01/01 16:56:55 GMT Standard Time,
denver.farley@monroe.army.mil writes:
<< I am not sure what the readings should be, perhaps we could pose this
question to the List as follows:
Does anyone know what the engine cylinder compression readings should be
for
an M151A2 engine? >>
Hello Denver and Anith.....
the trusty ol' TM (-20) says that "Compression at cranking is 135 to 145
psi".
It goes on to say (page 2-87) that:-
"the lowest reading cylinder should be within 25psi of the highest reading
cylinder. The minimum allowable pressure reading is 85psi.".
The TM also warns that valve clearance must first be checked at 0.015 inch.
Hope this helps.
Kind regards.
Ken
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