Rear Main Bearing Drain

[Bob Bidonde]

The OEM drain tube design makes no sense to me. In my opinion, the OEM drain cannot handle the motor oil flow rate from the rear main bearing, so oil backs-up and goes to the ground.

The engine in my 190A has two oil drains. The OEM drain tube is in place although not in the picture. The 2nd oil drain empties into the pan above the oil level. Having driven this engine a few thousand miles, I notice hardly any motor oil leakage, far less than the leakage in my 45B which has the OEM drain only. So I will be removing the OEM oil drain tubes from my engines.