[DeTomaso] NPC Trouble Shooting and Compression Test Question

JEFFREY COBB zumzum at cox.net
Sun Mar 4 12:22:54 EST 2012


All they will be able to do will be a leak down test, and should do which is better than a compression test anyway.


Jeff Cobb
Cell 225-907-4514

Jeff Cobb Auto Works
1316 South Acadian Thruway 
Baton Rouge
Louisiana, 70806

www.liveoakconcours.org
Concours, April 13-15, 2012

Text   225-907-4514
Work  225-343-7525
Fax    225-343-7550
zumzum at cox.net
jeffcobb1 at me.com				

On Mar 4, 2012, at 10:46 AM, Tom Borcich 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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