[DeTomaso] NPC Trouble Shooting and Compression Test Question
Gpd4
gpd4 at juno.com
Sun Mar 4 11:52:31 EST 2012
Put the heads back on, torque properly, then do a coolant system pressure test. You'll probably identify the problem quickly.
Sent from my iPhone
On Mar 4, 2012, at 11:46 AM, Tom Borcich <tborcich at msn.com> wrote:
>
> 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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