Hi All,
I just bought a used pontoon with a 98 Mariner 50 on it. It's a 4 stroke engine and reportedly ran well since it was bought new in 2002. The seller states that on his last outing he attempted to drive it onto his bunk-type trailer at low tide and briefly revved the motor, apparently much higher than normal cruising speed. Subsequently, he found blackish-gray oil oozing from the exhaust port. When he tried to re-start it, it ran, but he could hear a loud knocking sound from within. A boat mechanic told him the engine wasn't worth fixing.
What could happen inside a 4 stroke motor that could cause oil to come out the exhaust port and also create an engine knock? If it runs now (Briefly, at least), is it likely the motor "...is not worth fixing"? I've worked on car motors quite a bit, but this is my first marine motor. The seller thinks the head gasket failed, but that doesn't explain the oil coming from the exhaust port, (does it?).
Love to have your thoughts on this and what I might do to correct these concerns.
I just bought a used pontoon with a 98 Mariner 50 on it. It's a 4 stroke engine and reportedly ran well since it was bought new in 2002. The seller states that on his last outing he attempted to drive it onto his bunk-type trailer at low tide and briefly revved the motor, apparently much higher than normal cruising speed. Subsequently, he found blackish-gray oil oozing from the exhaust port. When he tried to re-start it, it ran, but he could hear a loud knocking sound from within. A boat mechanic told him the engine wasn't worth fixing.
What could happen inside a 4 stroke motor that could cause oil to come out the exhaust port and also create an engine knock? If it runs now (Briefly, at least), is it likely the motor "...is not worth fixing"? I've worked on car motors quite a bit, but this is my first marine motor. The seller thinks the head gasket failed, but that doesn't explain the oil coming from the exhaust port, (does it?).
Love to have your thoughts on this and what I might do to correct these concerns.