Head gasket job gone bad - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sleepertruck72 · 11-24-2013, 09:28 PM

Long story... a coworker did a head gasket on a 2007 GMC Yukon Denali. The driver side head had a broken exhaust manifold bolt at the rear of the head. So he did the job and when he fired it up it sounded like a racket. It sounded like something was loose maybe pushrods. He stripped it down and all was good. The pushrods were not oiling. No oil. We squirted some oil down the pushrod guides but it was still loud. We ran the engine for about 10 min. No change in noise. We removed the oil filter and ran the engine, oil pumped just fine. What could be the culprit ? Engine ran just fine prior to head gasket job. I did notice the head gasket was for 4.8 ,5.3,and 6.0. This is a 6.2. The gaskets do not have oiling provisions do they ? Were all sorta stumped...

sleepertruck72 · 11-27-2013, 05:28 PM

Well it seems the head gasket is specific for a 6.2 It has a slightly bigger bore. He removed the head hasket and found the pistons were slapping the gasket... all the lifters seem ok no scoring ..

4x4k30 · 11-28-2013, 06:14 AM

Quote:

Originally Posted by sleepertruck72

Well it seems the head gasket is specific for a 6.2 It has a slightly bigger bore. He removed the head gasket and found the pistons were slapping the gasket... all the lifters seem ok no scoring ..

glad yall found the problem

11-24-2013, 09:28 PM	#1
sleepertruck72 Registered User Join Date: Nov 2007 Location: Turlock California 95380 Posts: 2,075	Head gasket job gone bad Long story... a coworker did a head gasket on a 2007 GMC Yukon Denali. The driver side head had a broken exhaust manifold bolt at the rear of the head. So he did the job and when he fired it up it sounded like a racket. It sounded like something was loose maybe pushrods. He stripped it down and all was good. The pushrods were not oiling. No oil. We squirted some oil down the pushrod guides but it was still loud. We ran the engine for about 10 min. No change in noise. We removed the oil filter and ran the engine, oil pumped just fine. What could be the culprit ? Engine ran just fine prior to head gasket job. I did notice the head gasket was for 4.8 ,5.3,and 6.0. This is a 6.2. The gaskets do not have oiling provisions do they ? Were all sorta stumped... __________________ 72 C20 Longbed 05 1500 Z71

11-27-2013, 05:28 PM	#2
sleepertruck72 Registered User Join Date: Nov 2007 Location: Turlock California 95380 Posts: 2,075	Re: Head gasket job gone bad Well it seems the head gasket is specific for a 6.2 It has a slightly bigger bore. He removed the head hasket and found the pistons were slapping the gasket... all the lifters seem ok no scoring .. __________________ 72 C20 Longbed 05 1500 Z71



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