What happens when...

[Mitch7182]

Good afternoon all;

What happens when the wrong exhaust manifold gasket is installed?

I have a 1987 3.0 Mercruiser and have water in the oil, I started tearing down the engine and noticed the exhaust manifold was split in two.

I started looking to purchase a new one and none of the ones from iboats looked like the one I just took off. I went out and lined the gasket up with the mounting holes and it is the wrong one, it literally cut half the ports off and restricted the intake and exhaust.

Could this cause the water in my oil, or am I still looking at a possible cracked block?
Running rough at full throttle?
What else?

Thank you!!!

 

[Bifflefan]

Re: What happens when...

On a 4 cyl, id have to say no on the gasket causing the oil in the water or visa-versa. But it is probably the cause of the bad running.
If you only have a small amount of water inthe oil try using a ceramic block sealer and see if that helps.

 

[bomar76]

Re: What happens when...

If you only have a small amount of water inthe oil try using a ceramic block sealer and see if that helps.

Never gonna work in a raw water cooled engine.

 

[180shabah]

Re: What happens when...

For water and oil to mix at the gasket surface, you would need both water and oil passages present.

I think you are chasing your tail, trying to get a new gasket for a cracked block.