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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,234
Could be exhaust valve seals and guides. They become submerged in oil when the motor sits overnight and some of the oil in the oil tanks slowly drains down seeping past the oil pump gears into the engine case until the oil level in the the oil tank and engine case is the same.

If you take off the upper rocker arm cover after the motor has been sitting overnight and look down in there with a flashlight you'll see the oil level has raised up in there.
Then when you start the cold motor the scavenge side of the engine oil pump quickly pumps the oil out of the case to the oil tank through the oil filter where it drains from the filter into the oil tank.

Exhaust valve guides in these motors are known for wearing out after 40,000 miles because of the heat and rpms they usually get run at.

Last edited by JFairman; 03-14-2014 at 06:24 AM..
Old 03-14-2014, 06:21 AM
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