1991 Mercruiser 4.3

[countryboy996]

I just recently bought a boat that the engine was froze up in it. I pulled the engine and it was completely seized and full of rust.


Now I have a new engine and I'm putting the accessories back on. I went to clean the manifolds and risers and notice when there laying on their side and I run water through the water jet, water comes out of exhaust ports. If I stand them as they were sitting on the engine, I can run water in them and I don't get any water in the exhaust. Does this sound right?

 

[Scott Danforth]

I would get new manifolds and risers

 

[Rick Stephens]

Only way to test exhaust is to block off the top and put a little pressure on the water side.

 

[achris]

If you change manifolds and elbows, update to the 'dry-joint' ones.

Chris........