5.7 mercruiser had water right side all four cylinders no sign of blown head gas

[BNL]

as of right now the motor is on an engine stand and I have both heads off but there is no sign of a blown head gasket. Also at this point I can't turn the motor with a cheater bar I think it is rusted tight but not ceased.Any advise as were to start?should I have the heads x rayed-then the block-buy a new motor or have it sleved

 

[oar master]

Re: 5.7 mercruiser had water right side all four cylinders no sign of blown head

Re: 5.7 mercruiser had water right side all four cylinders no sign of blown head

i would have the heads pressure tested, also exh. manifolds & risers, before u start tearing down the engine. what yr. is it? ever run in salt water?

 

[BNL]

Re: 5.7 mercruiser had water right side all four cylinders no sign of blown head

Re: 5.7 mercruiser had water right side all four cylinders no sign of blown head

yes it has been run in salt water before I bought it but now fresh water only.p.s I've heard that if you shut it down while its in gear the engine will suck water through the exaust valves but I'm not sure thats true.

 

[BNL]

Re: 5.7 mercruiser had water right side all four cylinders no sign of blown head

Re: 5.7 mercruiser had water right side all four cylinders no sign of blown head

also it is a 1991

 

[hondon]

Re: 5.7 mercruiser had water right side all four cylinders no sign of blown head

Re: 5.7 mercruiser had water right side all four cylinders no sign of blown head

It sounds like you have a leaking exhaust mani. on that side. The real question is how much damage has been done.The turning it over with a breaker bar doe's not sound good.Are the plugs out?Have you tried to turn it over with the drive off?Will it turn over with the starter? How much,if any water in the oil?

 

[oar master]

Re: 5.7 mercruiser had water right side all four cylinders no sign of blown head

Re: 5.7 mercruiser had water right side all four cylinders no sign of blown head

if the engine hydrolocked u may have damaged the pistons. u can suck water through the engine by shutting it off in gear. is that what happened? if it was run in salt water & not flushed out regularly your probably looking at new manifolds & risers. they only last 5 yrs. or so anyway if run in salt. yours are 10 yrs.old. good luck.