Hello guys, I just purchased a new project for the winter so I am sure I will have a lot of questions along the way.
The boat is a 1997 Maxum 2800 SCR with a carbed 7.4l/bravo 3. I bought it knowing it had an issue or bad engine. Was told water was mixing with the oil. I never tried to crank it, I first pulled it out of the boat and drained probably 30-35 quarts of white oil/water milkshake. I was told it ran good on muffs for about 30 minutes until the milkshake oil started coming out of the breather tubes. Not sure how long the boat has sat with this stuff in the engine, was told it was about a month ago when ran.
I pulled all of the spark plugs and did a compression test. The cylinders on the port side (bank 1?) showed about 110 psi on cylinders 1 and 7 while cylinders 3 and 5 showed 65-75 psi. Cylinders 2,4,6,8 all showed roughly 90-110 psi. All of these numbers seemed low
I have been reading a lot of other forums online with similar issues and people say most of the time it is the exhaust manifolds/risers that are the problem. But I would think that most of the water would be pushed out of the exhaust valves unless maybe the rings are worn and causing the low compression and allowing water to seep by?
I am not sure which direction to head next, should I pull the heads off or go a different route?
The boat is a 1997 Maxum 2800 SCR with a carbed 7.4l/bravo 3. I bought it knowing it had an issue or bad engine. Was told water was mixing with the oil. I never tried to crank it, I first pulled it out of the boat and drained probably 30-35 quarts of white oil/water milkshake. I was told it ran good on muffs for about 30 minutes until the milkshake oil started coming out of the breather tubes. Not sure how long the boat has sat with this stuff in the engine, was told it was about a month ago when ran.
I pulled all of the spark plugs and did a compression test. The cylinders on the port side (bank 1?) showed about 110 psi on cylinders 1 and 7 while cylinders 3 and 5 showed 65-75 psi. Cylinders 2,4,6,8 all showed roughly 90-110 psi. All of these numbers seemed low
I have been reading a lot of other forums online with similar issues and people say most of the time it is the exhaust manifolds/risers that are the problem. But I would think that most of the water would be pushed out of the exhaust valves unless maybe the rings are worn and causing the low compression and allowing water to seep by?
I am not sure which direction to head next, should I pull the heads off or go a different route?