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Search took 0.00 seconds. Search: Posts Made By: mmwjr

Forum: Engines

07-25-2014, 04:01 PM

Replies: 9

Engine problem/no compression on 2 cylinders (merc 5.7 2002 250hp)

Views: 2,309

Posted By mmwjr

First I think it is the valve seat in the head...

First I think it is the valve seat in the head cast that yielded and not so much the valve failing. Second while SS are better using the word prevent is pushing the boat Gods around as under the...

Forum: Engines

07-25-2014, 11:39 AM

Replies: 9

Engine problem/no compression on 2 cylinders (merc 5.7 2002 250hp)

Views: 2,309

Posted By mmwjr

Any lower damage would start with the pistons....

Any lower damage would start with the pistons. Pull the heads and inspect the piston surfaces for missing metal. If they look good then I would expect the block to be ok.

My second boat had this...

Forum: Engines

07-25-2014, 01:44 AM

Replies: 9

Engine problem/no compression on 2 cylinders (merc 5.7 2002 250hp)

Views: 2,309

Posted By mmwjr

Tulip valves. The valve seat got so hot they...

Tulip valves. The valve seat got so hot they deformed. Exhaust valves?

1 and 4 are on opposite sides of the engine.

This happens when exhaust gases get too hot, I know of two reasons this can...

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