Hello My name is Jose and I am a new boat owner of a 2000 Maxum 2800 SCR with Twin 4.3L. I was told that the starboard engine needed Exhaust manifolds, Riser, Elbow because seller found water on one of the pistons (#1 and #2) , I knew that I had to work on getting a new starboard engine after I did a compression test on the starboard engine and the values were all over the place.. piston location #3 was 25 psi , #5 was 150 psi and #1 was 150 psi , then the other bank was around 150 and location #6 was 200 ... Anyway, I found water on the piston #1 and #4. I thought that I may have a stuck valve.. Anyway, having to change an engine helped me to get a really really good price on the boat
. My mechanic background is on vehicle engines (weekend warrior) , but my brother have a lot of experience on marine engine and restoring boats .. so we everything that we could from electricity connection all the way to hull conditions.. (no sea water test due to starboard engine issue) , port engine and outdrive worked great.
Now here was the plan, I had all the service records for this boat and every year it was winterized by the old owner . Since my family will be with me I had replaced the following on both engines just for safety,
1) riser, elbow and exhaust intake.
2) spark plugs
3) oil on the out-drive (bravo II)
While exchanging the all these above parts I was able to unstuck the valve :-) and I got all the pistons with a compression test on the 150 to 170 Psi.
The plan was to use the old oil already on the starboard engine and start the engine ( boat is on trailer) water ears connected and any water flushed out before I installed the new marine spark-plugs. This engine was sitting for a year .. and after some starting fluid ( 1 carburated ) the engine started and it sound really well , I could not believe how good the engine sound and the minimum of it ... all stable the sound for this 4.3 L engine .. wait too happy . Temperature was 175 and kept on that way for the 5 to 7 minutes that it was ran to warm up the oil. Then I applied to flush the engine since I did not know what was inside that engine for 1 year , Then I restart the engine with the Oil cleaner flush added to the oil, 5 minutes later engines is ready to get the oil out . It came out milky as a cappuccino which I said well I did not know how how much water is there was any water on the carter beside the cleaner I added to the oil. so after the old oil its out I just pour another gallon of oil(cheap one ) just to flush any residue of the cleaner (no oil filter change yet) . This time the engine took 3 more tries to start , but came to run smooth . When I pull the oil out ( cheap one ) I was expecting to see just a little bit of the left over of the cleaner , but my surprise is milky oil all over again.
I said .. man the engine its really mess up, ( block is gone). It could be the intake head gasket which 4.3 L are famous to mess them up and let water to leak to the intake.
Time to remove spark plugs and flush the water out of the engine again, like water fountain
. Here are the pictures of the intake, I do not see any damage to the intake gasket , but what I did notice is the exhaust holes are corrode , but the water one are fine.. where is this water coming from ? Head gasket when compression test came back fine with approx 150 all around ? Any other idea before I say is the bloke that is gone ?
The rusted one are the exhaust intake and should not be any water on them ? just gas ... where is the water coming from ? Block is gone that it gets all this water flooded all the way to these holes ? did you see any damage on the seal ? there is a little pinch on the water hole , but I believed that happened when I remove the intake... Please let me know any idea would be well recieved..