91 M42 302K miles
Compression test hot 1 to 4.
175 / 170 / 170 /175 psi
Leak Down Cold @ 100 psi
18% / 22% / 23% / 19%
2 and 3 have no bubbles in the coolant but the coolant level slowly rises and overflows out of the expansion tank when pressurized. 1 and 4 are normal.
While running with the valve cover vented to atmosphere and the throttle nipple capped, I'm getting some steam / blowby out of the valve cover.
Car runs well, doesn't overheat and the plugs look normal. It looses a few inches of coolant out of the expansion tank every 500 miles.
No oil in coolant or coolant in oil.
Crack / Profile gasket?? Car wasn't overheated. Do they normally crack in two cylinders? I assume the head gasket is OK based on above.
Compression test hot 1 to 4.
175 / 170 / 170 /175 psi
Leak Down Cold @ 100 psi
18% / 22% / 23% / 19%
2 and 3 have no bubbles in the coolant but the coolant level slowly rises and overflows out of the expansion tank when pressurized. 1 and 4 are normal.
While running with the valve cover vented to atmosphere and the throttle nipple capped, I'm getting some steam / blowby out of the valve cover.
Car runs well, doesn't overheat and the plugs look normal. It looses a few inches of coolant out of the expansion tank every 500 miles.
No oil in coolant or coolant in oil.
Crack / Profile gasket?? Car wasn't overheated. Do they normally crack in two cylinders? I assume the head gasket is OK based on above.
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