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[oletrucks] Special tool needed

To: "oletrucks" <oletrucks@autox.team.net>
Subject: [oletrucks] Special tool needed
From: "Hanlon, Bill" <Bill.Hanlon@COMPAQ.com>
Date: Tue, 23 Apr 2002 13:22:22 -0500
I need to replace the oil pan gaskets on my 57 
GMC V8 to fix a leak.  The engine has about 
80,000 miles on it's only rebuild.  It has 
good compression on all cylinders.  Oil pressure 
is OK, but drops to around 15-16 PSI at an idle 
(450 RPM) after 10 miles at 70 MPH @ 90 degree 
air temp.  At the same idle after normal in-town 
driving the oil pressure is around 20 PSI.
When it was rebuilt the crank was measured and 
found to be within spec, so it was polished 
and re-installed with STD/STD bearings.

Back when our trucks were fairly new there was a 
tool that one could use to "roll out" and "roll in" 
new main bearings without actually removing the 
crankshaft.  The tool had a round stud on it that 
fit into the oil hole on the crank journal and a 
head that was thinner than the bearing shell 
thickness.  You remove the main bearing cap, 
stick the tool into the oil hole and turn the crank 
in the right direction to remove the bearing shell.
Install the new shell in the opposite direction, 
put the other half into the main cap, retorque and
move on to the next main.  

If I could find one of these I would consider 
installing a new set of standard size main 
and rod bearings and a new oil pump while 
I have the pan off.

Two questions:
        1.      Anyone know where I can find one of these 
        2.      Any reason not to do this?  I know that 
                the right way is to remove the crank, 
                have it magnefluxed, checked for taper, 
                checked for out of round, ground if 
                necessary, etc. etc. etc.  I am looking 
                at this as low-cost preventative maintenance 
                and am not planning to tear the engine 
                down until it needs it.
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959

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