Water coming into hull from under the exhaust manifold

[lbkos1]

I just purchased a 1996 GTI with a 720 engine. It runs fine but I have water coming out from under the exhaust manifold when I hook up a water hose to flush it. The water comes out where the yellow circle is on the pic. I thought there must be a bad gasket so I took the head off. None of the gaskets or seals looked like they were leaking and there was no water in the cylinders. I traced how the water makes it way through the engine and exhaust and want to know if I am understanding it. There is a water inlet on the left rear side of the head cover. The water exits the front of the head and goes through the the tuned pipe to the exhaust manifold and exits out the bottom of the manifold. I think I understand that loop but the water doesn't appear to go into the cylinder jacket. Someone had this apart previously and I am wondering if I am missing a part. Should the yellow circled area be exposed? How does water enter the cylinder Jacket? I would appreciate some help because this make no sense to me.

 

[Ckrawiec]

Hope this helps some....see attached files

 

[lbkos1]

Thanks for the attachments. Unfortunately they show the loop that I understand. They don't show how the cylinder jacket gets water circulated through it. I was thinking maybe the cylinder jacket isn't cooled with water but that doesn't make sense either because when I hook up the garden hose to flush, the water runs through the cylinder jacket and out the low point in the circuit. Maybe there is a check valve at the low point where the water comes out that closes under pressure. I guess I'll put it back together and see if it works in the water. I just wish someone could explain this to me. Thanks again for replying.

 

[Ckrawiec]

Thanks for the attachments. Unfortunately they show the loop that I understand. They don't show how the cylinder jacket gets water circulated through it. I was thinking maybe the cylinder jacket isn't cooled with water but that doesn't make sense either because when I hook up the garden hose to flush, the water runs through the cylinder jacket and out the low point in the circuit. Maybe there is a check valve at the low point where the water comes out that closes under pressure. I guess I'll put it back together and see if it works in the water. I just wish someone could explain this to me. Thanks again for replying.

Yeah, seadoo doesn't really illustrate that...but on the diagram there is a notation -> "Water flows through tuned pipe and manifold water jackets"...so that does mean that the yellow circle in your picture is the point source for water to LEAVE the cylinder jackets. There is no check valve indicated in the system that would close under pressure that I have ever heard of or seen.....

 

[mikidymac]

Water enters through the head then down into the cylinders. Some water is diverted from the head to the pipe and out the back of the ski.
The water from the cylinders exits through the ports in your picture into the exhaust manifold then some goes out the low level drain on the manifold and some goes into the pipe.

 

[lbkos1]

It would make sense for the circled area to be the water source for the cylinder jacket but I don't see where that water would come from. There is a fitting at the bottom of the exhaust manifold that was hooked to a hose exiting the hull and it seems like the drawing is showing that. I keep thinking I am missing a part that feeds water into the circled port but I don't see anything on the parts list or drawing.

 

[mikidymac]

It would make sense for the circled area to be the water source for the cylinder jacket but I don't see where that water would come from. There is a fitting at the bottom of the exhaust manifold that was hooked to a hose exiting the hull and it seems like the drawing is showing that. I keep thinking I am missing a part that feeds water into the circled port but I don't see anything on the parts list or drawing.

Did you read post #5? That "circled hole" is not and inlet into the cylinders but and outlet from the cylinders to the manifold. The hose is a drain fro when you shut the ski off so water and sand don't plug and freeze the cylinder water jackets.

 

[lbkos1]

Water enters through the head then down into the cylinders. Some water is diverted from the head to the pipe and out the back of the ski.
The water from the cylinders exits through the ports in your picture into the exhaust manifold then some goes out the low level drain on the manifold and some goes into the pipe.

The port I have circled was exposed when I purchased it. The exhaust manifold does not cover it. Do you think I am missing a part?

 

[mikidymac]

If it was exposed then you absolutely have the wrong manifold.
The manifold matches the cylinder ports.

 

[lbkos1]

Did you read post #5? That "circled hole" is not and inlet into the cylinders but and outlet from the cylinders to the manifold. The hose is a drain fro when you shut the ski off so water and sand don't plug and freeze the cylinder water jackets.

I did read post #5 but the "circled hole" is exposed below the exhaust manifold. The manifold doesn't cover it. Someone had this apart before and I'm wondering if I am missing a part.

 

[lbkos1]

The port I have circled was exposed when I purchased it. The exhaust manifold does not cover it. Do you think I am missing a part?

Ahhhh... There is my answer! My manifold doesn't look like that. Thank you!

 

[mikidymac]

I would check over that ski really good, someone has been swapping the wrong parts around.

 

[lbkos1]

I would check over that ski really good, someone has been swapping the wrong parts around.

Putting the the wrong manifold on is concerning. Hopefully that is the only issue. I may as well put rings in and check the cylinders while I have it apart. Thanks again for your help. I never gave a thought to it being the wrong manifold.

 

[mikidymac]

No reason to replace rings if compression is good. Also new rings will not help if the cylinder is worn past spec.