Hi,
Have a problem here. I have a 2001 2150 Bayliner Capri with the Merc 305 CID engine 2 barrel carb. I run my boat all year long so it really never sits for more than a couple of weeks. Was up on Tahoe and at about 3000 RPM the boat would surge a bit (much like a waterskier was on an outside turn). Got it home and decided to check the tune. Pulled the plugs and when I got to Cylinder #5 water ran out. Pulled the exchast, Flappers look good. Pulled the risers and they look good although there was water in the exhast manifold. I then went and did a compression check (after pulling all the plugs to dry out #5 which was the only one that showed water leakage) and they were all over the place, 1 and 2 being the only ones in range. I then pulled the heads. Seems I have four cracks, the longest being a inch and a half long, all coming from the exhaust valve seat, all in the same place by the webbing and all between the middle two cylinders, both sides, 3 and 5, 4 and 6. Head gasket shows that it appears that the engine got hot as there was carbon between these cylinders on the gasket.
Not sure what went wrong but I don't want it to happen again. I'm a maintenance freak. I bought the service manuals they say change the oil every 100 hours, I do 50. Plugs, tune up, oil, filter (both oil and fuel) are changed at the same time. Change the gear oil at the same time. The boat has only 376 hours on it and you can eat off the engine. It has never over heated on me and I'm the only one who has driven it. I changed the impellar at 250 hours which was two years in and have a note to wait three as it was in such good condition. I have had one problem with the cooling system and that was the thermostat stuck open and boat wouldn't come up to tempature (raw water system), which the gauge indicated so I'm assuming that works. Never seen any oil in the block and I've pulled the motor to inspect it. Water jackets look good, no ring wear, no bearing wear. I don't beach the boat at all. I don't come off of full throttle quickly as the 2001-13 Merc bulliten suggests. I pull all the blue drainage plugs in the winter as I live in the mountains and it does drop below freezing. Most of the time I'm fishing so the big motor just gets me there and then I transfer to the kicker.
So the problem is, now that I'm putting new heads in at $980 a piece from mercury, how the heck do I avoid this from happening in the future? Has this happened to anyone else? Any ideas out there?
I'm totally at a loss as to how this happened.
Thanks
Ski
Have a problem here. I have a 2001 2150 Bayliner Capri with the Merc 305 CID engine 2 barrel carb. I run my boat all year long so it really never sits for more than a couple of weeks. Was up on Tahoe and at about 3000 RPM the boat would surge a bit (much like a waterskier was on an outside turn). Got it home and decided to check the tune. Pulled the plugs and when I got to Cylinder #5 water ran out. Pulled the exchast, Flappers look good. Pulled the risers and they look good although there was water in the exhast manifold. I then went and did a compression check (after pulling all the plugs to dry out #5 which was the only one that showed water leakage) and they were all over the place, 1 and 2 being the only ones in range. I then pulled the heads. Seems I have four cracks, the longest being a inch and a half long, all coming from the exhaust valve seat, all in the same place by the webbing and all between the middle two cylinders, both sides, 3 and 5, 4 and 6. Head gasket shows that it appears that the engine got hot as there was carbon between these cylinders on the gasket.
Not sure what went wrong but I don't want it to happen again. I'm a maintenance freak. I bought the service manuals they say change the oil every 100 hours, I do 50. Plugs, tune up, oil, filter (both oil and fuel) are changed at the same time. Change the gear oil at the same time. The boat has only 376 hours on it and you can eat off the engine. It has never over heated on me and I'm the only one who has driven it. I changed the impellar at 250 hours which was two years in and have a note to wait three as it was in such good condition. I have had one problem with the cooling system and that was the thermostat stuck open and boat wouldn't come up to tempature (raw water system), which the gauge indicated so I'm assuming that works. Never seen any oil in the block and I've pulled the motor to inspect it. Water jackets look good, no ring wear, no bearing wear. I don't beach the boat at all. I don't come off of full throttle quickly as the 2001-13 Merc bulliten suggests. I pull all the blue drainage plugs in the winter as I live in the mountains and it does drop below freezing. Most of the time I'm fishing so the big motor just gets me there and then I transfer to the kicker.
So the problem is, now that I'm putting new heads in at $980 a piece from mercury, how the heck do I avoid this from happening in the future? Has this happened to anyone else? Any ideas out there?
I'm totally at a loss as to how this happened.
Thanks
Ski
