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Headgasket trouble? 900 1997

posted by  Amarin on  Sun May 8 17:40 CST 2022
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last visit: Thu Oct 23 22:42 CST 2014
[RELATED]

Here's what I see on your cylinder head




Those soot tracks shows points of failure on the headgasket and how exhaust gases got into the coolant channels, causing unusual high pressure within the cooling system

On the engine block, note that pistons 1, 2 and 3 are relatively clean (steam cleaned) compared to piston 4. These are consistent with the failure points on the cylinder head

The aluminium cylinder head expands faster than the iron engine block. I could see that those failure points are on the headgasket side facing (ie. rubbing against) the cylinder head.

Using a good coolant (like Volvo OE latest G64 Glysantin - better heat removal) and flooring the throttle only when engine fully warmed-up could delay these from happening. But eventually it (ie. replacing headgasket) would still happen because of the difference in expansion rate between head and engine block.

Amarin






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