[DeTomaso] NPC Trouble Shooting and Compression Test Question
Tom Borcich
tborcich at msn.com
Sun Mar 4 11:46:44 EST 2012
A couple of teenagers in the neighborhood are trying to fix their off road jeep that is pouring
white smoke out of the exhaust...the jeep has almost 197k miles according to the odometer. The
heads have a fresh rebuild (new valves, seats, guides, seals, milled) done by a local machine
shop. It looks like the short block had a rebuild recently (they bought it like this) because there's
no ridge in the cylinders and there's almost no carbon build up on the pistons or sludge build up in
the lifter valley which I would expect for a motor with this many miles on it.
They pulled the heads off before doing a compression check because someone thought they blew a head gasket.
But there are no signs of a blown head gasket...so I suggested throwing the heads back on just to
do a quick compression check to see if there are any glaring problems.
HERE'S MY QUESTION: Will the motor still give an accurate read if the valve train isn't fully put back
together or should they put the push rods back in also and adjust the lifters? Hydraulic cam and most
oil's probably drained out of the lifters. I'm thinking without the valves opening properly they
won't get correct compression test?
Thanks for the help.
Best Regards, Tom
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