Thread: 5.7 Heads replaced now low compression-Help !

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I just spoke to a marine mechanic and he said it maybe possible the rings are stuck. Due to having water in the engine from it being extinguished by a fire hose. Then I was not allowed to touch the boat what so ever for all investigations to be conducted including sheriff and insurance. That took almost 1 year! I was informed to put motor oil in cylinders. Any other thought or advise is greatly appreciated.
Fred

Originally Posted by fgil

I just spoke to a marine mechanic and he said it maybe possible the rings are stuck....
Fred

What did your marine mechanic advise? If you're confident that your heads are good and the head gaskets are right you might try getting a quart of Marvel Mystery Oil and putting a few ounces in each cylinder and let it soak overnight, then crank it over with the plugs out so you don't hydraulic the engine. Then I'd set the rockers using the zero lash method, bring it to #1 TDC and be sure your distributor is in right. Even with some cylinders at low compression it should fire if you're getting air, fuel and spark. If you get it to fire set your timing, then bring it up to temp and cycle the rpm's without getting crazy and see if it improves. Then check your compression again.