Mark IV oil relief
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Mark IV oil relief
I am putting a Mark IV back together and wondering if people have had experience with plugging the oil relief in the factory merc adapter that bolts to the filter pad. Previous to this rebuild, I installed a considerbly larger oil cooler, but still could get 250 degree oil in the pan and therorized a good bunch of the oil was bypassing and not getting to the cooler.
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Mine have been done for years, 1/2npt I believe. Didn't help oil temps though and that is why I originally blocked them. Since I have learned that other things like a/f ratio, bearing clearances and coolant temp play a larger role in excessive oil temps.