Join Date: Aug 2010
Location: MI - Michigan
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Head gaskets can typically fail in any/all engines in multiple ways. Between the water jacket, and cylinder, water jacket and oil galleys, cylinder and oil galleys, or in air cooled engines, cylinder and the outside of the block.
Coolant combustion gas tests only tell if it has failed between the water jacket and the cylinder. Coolant in oil or oil in coolant only happens if the gasket fails between those areas most often, but you can get coolant into the oil if enough coolant is being pushed into the cylinder. Different engines have different failures for head gaskets. Like diesels (6.0/6.4) you typically get coagulated coolant with oil and combustion gasses. Older gassers like my 3.8 Turbo in the GN most commonly failed and would push coolant into the cylinder and into the engine/oil pan. But the force of the coolant trying to hydrolock the engine under compression would take the bearings out and cause a knock before enough coolant was in the oil to totally ruin the bearings from contamination. Those were an odd bird though. Too much boost would lift the head, and literally flood the engine with coolant trying to lock it up.
I'm not sure how the Tundra's 5.7's fail most often.
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I put the Laughter in Slaughter, and the Fun in funeral.
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Last edited by Powertechn2; 03-28-2019 at 08:32 PM.