mercruiser 3.0

[sea deuce]

I get water in the #1 cylinder, I checked compression the number ! was filled with water, Thinking it was a head gas I sent the head out to have it done repaired a bad valve (from water) put I put it back together same problem . so I bought a new manifold and riser I put it back together again changed oil and filter started it up had a miss in it turned it off checked #1 filled with water again any ideas?

 

[alldodge]

I get water in the #1 cylinder, I checked compression the number ! was filled with water, Thinking it was a head gas I sent the head out to have it done repaired a bad valve (from water) put I put it back together same problem . so I bought a new manifold and riser I put it back together again changed oil and filter started it up had a miss in it turned it off checked #1 filled with water again any ideas?

:welcome: to iboats

Sounds like your not trying to find out what the problem is, your just throwing money at it. Only thing you haven't replaced that could cause water into number 1 cylinder is the engine block. That is unless the engine was not put back together correctly.

 

[Rick Stephens]

Time for a leak down test. Here's the Merc service bulletin:

http://www.boatfix.com/merc/Bullet/97/97_25.pdf

 

[Bt Doctur]

Water by itself will not "damage" a valve, what was the real cause to have the valve replaced.
My guess it was an exaust valve that was puckered, and you will find a hole under the exaust valve just above the valve seat

 

[flyman219]

"My guess it was an exaust valve that was puckered, and you will find a hole under the exaust valve just above the valve seat "

I agree, I'd put money on a cracked intake port in the head possibly above the valve seat. It happened to me on a Chev V8 years ago, thought it was a blown head gasket but on the SECOND teardown and head check the crack showed up in the upper head.
.

Mike