water in rear middle cylinder

[bobrock]

ok ... i have a 1988 omc cobra 5.7 ltr that was repowered with a long block and new exhaust manifolds, the risers are 2 years old, its raw water cooled and in salt water...i removed the riser and checked the gasket which didnt appear to be leaking but i resurfaced the two and replaced with a new gasket .. where can this water be comming from ???

 

[bobrock]

Re: water in rear middle cylinder

also can this all be removed while the boat is in the water?? if so how ..

 

[Haut Medoc]

Re: water in rear middle cylinder

Water in 1 cylinder or the whole bank?

 

[bobrock]

Re: water in rear middle cylinder

just that one cylinder

 

[Haut Medoc]

Re: water in rear middle cylinder

If you're sure it only has water in one cylinder, I would rule out the manifolds & risers. Is it alot of water? How did you discover it? Was it winterized properly? Does it run good? Are you seeing any milkiness in your oil? Water in only one cylinder would make me think that either the block/head has a crack or possibly a blown head gasket between the cylinder and the water jacket. Before ya go tearing it down, I would wait for more input from some of the pro's.

 

[TilliamWe]

Re: water in rear middle cylinder

Originally posted by J.kopec:<br /> If you're sure it only has water in one cylinder, I would rule out the manifolds & risers. Is it alot of water? How did you discover it? Was it winterized properly? Does it run good? Are you seeing any milkiness in your oil? Water in only one cylinder would make me think that either the block/head has a crack or possibly a blown head gasket between the cylinder and the water jacket. Before ya go tearing it down, I would wait for more input from some of the pro's.

Kopec you may be exactly right but...<br /><br />I never rule out the exhaust manifolds or risers when a marine engine has water in a cylinder! <br />Plus they are the easiest thing to remove from the engine & have checked.

 

[Haut Medoc]

Re: water in rear middle cylinder

Tilliam wet,you are correct. However, I can't help but think that if it were a bad manifold/riser that water would be present in all cylinders on that side. His manifolds are new and his risers are two years old. I concede the fact that the only way to rule them out would be to pressure test them.

 

[bobrock]

Re: water in rear middle cylinder

im gonna pull the manifold and riser and bench test em next

 

[bobrock]

Re: water in rear middle cylinder

manifold pulled ... benchtested good ... next im pullin the head and lookin for a cracked block or a blown head gasket

 

[bobrock]

Re: water in rear middle cylinder

yep blown head gasket... runs better but who knows how long the cylinder will last

 

[Haut Medoc]

Re: water in rear middle cylinder

Glad it was nothing major! I guess you'll be out this weekend - Stripers still bitin'?

 

[bobrock]

Re: water in rear middle cylinder

yea the stripers are JUMPIN in the boat ...