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Old 03-21-2005, 04:52 PM   #1
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FXT 11.6@118 93 oct
NSX 450 whp SC'd (93 oct)

Default Diagnosing which head gasket failed?

I have a '98 Outback that has the signs of a failed head gasket. Whats the best way to diagnose which side has the failure? I would think that a compression test would likely read lower on at least one of the two cylinders on the side w/the failure.

Any other suggestions? I don't want to pull both heads if I can help it.


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Old 03-21-2005, 04:59 PM   #2
Tim Sanderson
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00 Impreza 2.5 RS
Blue Ridge Pearl


Changing both would eliminater the need to define which one it is.
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Old 03-21-2005, 05:28 PM   #3
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A compression test might tell you which cylinder is leaking. A leakdown test would work better. Check out this link and this link.
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Old 03-21-2005, 05:48 PM   #4
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pull the plugs, if one side looks very white, like it was cleaned, thats the side.

When coolant boils in the cylinder it in effect steam cleans the plugs.

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