Hey guys,
Looking for some pointers here.
I have a 1995 Volvo Penta 7.4GL (454) raw water cooled engine that has experienced oil in the water. Have been running the engine off a hose, and noticed the oil to be a white milkshake. Ran the engine a little hot, white steam came out of the exhaust, and the color of the oil darkened. I gave it an oil change thinking it was some condensation left over since it has been sitting for a while, but the water milkshake returned.
I started thinking leaking exhaust manifold/risers, but when I took those off and tested them with water, nothing leaked back into the exhaust ports.
I started thinking that it was a blown head gasket and began taking the engine apart. On first glance the gaskets for the intake manifold were really bad, and crunchy. I thought maybe this could be the reason for the leaking but I figured I'd just replace the head gaskets since im taking the engine apart. I then discovered the intake manifold had a hole in it, starboard side on the middle port (I think its air intake from the carb?). I bought a new iron intake manifold to fix this issue.
I then started taking off the heads, checked the valve for leaks by filling the intake and exhaust ports with water and waiting for some leaks. A couple of them did have some leaks (probably some bad compression going on), so I did a valve refresh with some valve grinding compound, checked for leaks and all is good.
The head gaskets seem to be in good condition, they're not corroded or cracked. I did notice some slight surface rust on a couple of the cylinder walls. Could that be indicative of water in the cylinder?
Anything else I should be looking for before putting everything back together? I'm in San Diego, CA, so no temperatures below freezing. Boat has been stored on a trailer. I would hope that the block is not cracked. Any tips or advice on what I can do would be greatly appreciated.
Thank you
Looking for some pointers here.
I have a 1995 Volvo Penta 7.4GL (454) raw water cooled engine that has experienced oil in the water. Have been running the engine off a hose, and noticed the oil to be a white milkshake. Ran the engine a little hot, white steam came out of the exhaust, and the color of the oil darkened. I gave it an oil change thinking it was some condensation left over since it has been sitting for a while, but the water milkshake returned.
I started thinking leaking exhaust manifold/risers, but when I took those off and tested them with water, nothing leaked back into the exhaust ports.
I started thinking that it was a blown head gasket and began taking the engine apart. On first glance the gaskets for the intake manifold were really bad, and crunchy. I thought maybe this could be the reason for the leaking but I figured I'd just replace the head gaskets since im taking the engine apart. I then discovered the intake manifold had a hole in it, starboard side on the middle port (I think its air intake from the carb?). I bought a new iron intake manifold to fix this issue.
I then started taking off the heads, checked the valve for leaks by filling the intake and exhaust ports with water and waiting for some leaks. A couple of them did have some leaks (probably some bad compression going on), so I did a valve refresh with some valve grinding compound, checked for leaks and all is good.
The head gaskets seem to be in good condition, they're not corroded or cracked. I did notice some slight surface rust on a couple of the cylinder walls. Could that be indicative of water in the cylinder?
Anything else I should be looking for before putting everything back together? I'm in San Diego, CA, so no temperatures below freezing. Boat has been stored on a trailer. I would hope that the block is not cracked. Any tips or advice on what I can do would be greatly appreciated.
Thank you