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Old 08-31-2018, 02:55 AM   #1
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Default Headgasket question on an 86 z2.4

Seems my HG is blown between 3/4. During this time of diagnosing these issues( 180 on 1/2 and barely 30 on 3/4), I heard what seemed like a wristpin knock or something similar. Can this happen from low compression? Not a constant knock but under slight load its pretty bad. thx for the help!
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Old 08-31-2018, 03:09 PM   #2
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Maybe it's time to replace the pistons/rings and connecting rod bearings and to have the connecting rods checked.
2004 Frontier King Cab (2WD, 5-speed, 4-cylinder, 98.5K), 1998 Frontier regular cab (2WD, 5-speed, 4-cylinder 225K), 1988 Mazda B2200 (2WD, 5-speed, 4-cylinder, 214K), 1971 VW Convertible (140K), 2005 Yukon (180K), 1970 VW (260+K)
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Old 08-31-2018, 05:13 PM   #3
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They almost always bridge between 3 & 4. What you hear is likely to be compression from one cylinder blowing into the neighboring cylinder and making funny noises.
I had one fail that way, but it was a long time ago. I can't recall all the sounds it made.

I had the head on the bench 20 minutes after I limped it home. My son and I lifted it off the block with welding gloves.
It was warped enough that it needed to be milled flat again.
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