"How
to Make"
Oil Cooler Test Tool
Q&A Check Crankshaft
This Main Bearing has less then 2 hrs running time on it.
As the motor accumulates miles, the oil pressure will gradually decrease a little and after many miles the sludge and dirt accumulates in end of the oil passages where they are cross drilled.
Then you rebuild the engine and all the bearings are nice and tight plus the new oil pump does it's job and the oil pressure and volume are suddenly increased, washing the dirt and sludge out that has been building up for years. That's what happened to the above main bearing in less then two hours of running, the damage was probably done in less then 5 minutes.
See this page on proper cleaning oil passages in VW case.--> Click
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