2003 5.7 Volvo Penta water in oil

[Jamz33]

Boat started getting hot. Thought it was maybe something minor (thermostat, impeller, water pump) all checked out good. Then I noticed water in the oil. Pulled the plugs. Blowing water out of #4 and #6. I know it could be a plethora of things, but where do I start?

 

[Bt Doctur]

the most likely cause is
a leaking riser
a leaning manifold
blown head gasket
cracked block from improper winterizatin

 

[Jamz33]

I took the exhaust manifold off and I noticed as I took the bolts out that the 2 bolts closest to 4 & 6 were discolored and rusty. I assume that may say something?

 

[Jamz33]

I think the gasket ripped as I was removing it.

 

[Scott Danforth]

I think you have a manifold to riser leak on this side. there should be NO rust in the port.

 

[Jamz33]

I think you have a manifold to riser leak on this side. there should be NO rust in the port.

View attachment 419005

Ok. I didn’t put pressure to anything but I filled the water side up and nothing came out of the exhaust ports. But nothing may show up unless I put pressure to it?

How exactly is the best way to pressurize the manifold and riser together? I’m just not sure how to cap off the outlet side.

 

[Scott Danforth]

You visually inspect the gaskets and gasket surface between the two, and you fill the manifold with acetone (seeps thru smaller cracks)

However if you boat in salt water, expect about 5-7 years max on the life of a manifold

 

[Jamz33]

Ok. It’s just a fresh water boat. I’m going to set it up to pressure test the engine.

 

[Lou C]

There is a pipe plug on top of the exhaust elbow. If you can remove this you can snake an endoscope camera inside and know for sure if the leak is from the joint between the elbow & the manifold. If so that’s your answer. Freshwater boat, if the sealing surfaces clean up well you might be able to put it back together with new gaskets. I check mine at the end of every season that way.

 

[Jamz33]

There is a pipe plug on top of the exhaust elbow. If you can remove this you can snake an endoscope camera inside and know for sure if the leak is from the joint between the elbow & the manifold. If so that’s your answer. Freshwater boat, if the sealing surfaces clean up well you might be able to put it back together with new gaskets. I check mine at the end of every season that way.

Ok thanks for the reply

 

[Jamz33]

Once I pressure test the engine, if there is an issue with the block, head, or head gasket, would I be able to determine which one is damaged? If so how? And I mean would I be able to tell which one is bad without tearing it apart first.

 

[Scott Danforth]

If you have a problem with the block and heads, you follow the sound of the escaping air.

Remember air tests must have all the water removed from the water jacket.

However I doubt you have a water jacket issue, as the port being rusted is from water entering the exhaust