hello
i have a friends 2001 mercury 150 EFI. last year the boat went out for the second run of the year just after the lower unit was replaced. the engine stopped about 50 feet from the dock. it would not turn over and i was told it was seized. i was not there but i have been told that it would not turn when they tried to hand start it with a rope. the boat has sat on the trailer for a year and today i took the crank cover off and i was able to turn the crank by hand. i turned it a few times and then it got tight and now will turn about a quarter revolution and then stops. the plugs were removed last year and some oil was squirted into the piston chamber. the prop and prop shaft was remover last year as well. what should i do next? i am thinking i should pull off the head covers. any suggestions will be welcomed. if i can turn the crank could it be that only one of the pistons is seized? can you replace just the rings and a piston or do i have to get the thing board out and replace all of the pistons?
thanks
i have a friends 2001 mercury 150 EFI. last year the boat went out for the second run of the year just after the lower unit was replaced. the engine stopped about 50 feet from the dock. it would not turn over and i was told it was seized. i was not there but i have been told that it would not turn when they tried to hand start it with a rope. the boat has sat on the trailer for a year and today i took the crank cover off and i was able to turn the crank by hand. i turned it a few times and then it got tight and now will turn about a quarter revolution and then stops. the plugs were removed last year and some oil was squirted into the piston chamber. the prop and prop shaft was remover last year as well. what should i do next? i am thinking i should pull off the head covers. any suggestions will be welcomed. if i can turn the crank could it be that only one of the pistons is seized? can you replace just the rings and a piston or do i have to get the thing board out and replace all of the pistons?
thanks