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Guest Message by DevFuse

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2.5 Head Gaskets

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1 reply to this topic

#1 WannabeWrxOwner


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Posted 26 March 2006 - 02:06 PM

Hey guy's, I'm replacing the headgaskets on my 98' GT. Do you guy's have any tips for me? Should I use sealant with the headgaskets? Or just use plain gaskets?
Any tips would be great.

#2 nipper


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Posted 26 March 2006 - 03:34 PM

NEVER NEVER NEVER use sealnt on a headgasket. This has been covered on previous posts. The decks of the Cylinder and Cylinder head haave to be completley clean. The Cyl Head surface has to be Flat (which requires a machine shop check as most people dont have the micrometers to check this) with no runout. The Headgasket deforms a bit to make the seal. You have combustion pressures of 15-18,000 psi and coolant pressure of ~14psi. Any dirt and the two of them will find a path to leak. You also have engine oil under pressure.
There is also a specific sequance to tightening the Cyl Heads bolt that you need to follow as the manual states.


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