SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: Jasonserb on September 08, 2020, 07:37:35 PM
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So my brother took my boat air born at about 10,000 rpm. Blew the PCV out of it and lost about a quart of oil. Now the motor has a slight knock to it. I've drained and replaced the oil. There was no metallic look to it. The oil filter also looked good. I've been told a couple different things it could be but have no clue where to start looking for the issue.
Thanks in advance
Jason
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Just replied to your other post......honestly if you were in the throttle for any more than say 30 to 50 seconds wide open doing half that rpms with out the oil mods done your bearings are toast.....i have a olds and 2 of my buds have olds and blew em both up this season....one was cause the oil pick up wasn’t set right and ran out of oil at 4000 rpm and the other had extreme blow by keep running it high rpm also blew the bearing ran out of oil.....good place to start is get a stethoscope and hear where it is knocking or pull it and check the bearing and hope it didn’t mess up the crank shaft....
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Just replied to your other post......honestly if you were in the throttle for any more than say 30 to 50 seconds wide open doing half that rpms with out the oil mods done your bearings are toast.....i have a olds and 2 of my buds have olds and blew em both up this season....one was cause the oil pick up wasn’t set right and ran out of oil at 4000 rpm and the other had extreme blow by keep running it high rpm also blew the bearing ran out of oil.....good place to start is get a stethoscope and hear where it is knocking or pull it and check the bearing and hope it didn’t mess up the crank shaft....
Used a stethoscope the noise is coming from the back 2 cylinders
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