1970s 1150 mercury 115 hp top piston has metal plate over plug hole???

mr 88

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Re: 1970s 1150 mercury 115 hp top piston has metal plate over plug hole???

the oil feed line that runs from the bottom of the block to the top was cracked and clearly needs replacment. how would that make the top piston melt down tho? doesnt that just feed the main bearing?
I would put money on that being the culprit.The top cylinder does not get the complete oil/gas mixture like the rest do.That is the main reason for that line being there.Just rebuilt a 1400 with the top cylinder fried and a broken oil line staring at me, motor was bought that way..
 

Wdr

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Re: 1970s 1150 mercury 115 hp top piston has metal plate over plug hole???

Make sure you re-ring the other cylinders and replace the trigger as well...

is there a way to test the trigger? or do you just change them out?

i wasnt able to find this part either.
 

CharlieB

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Re: 1970s 1150 mercury 115 hp top piston has metal plate over plug hole???

Add Carb kits and new floats

Fuel pump rebuild kit
 

merc850

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Re: 1970s 1150 mercury 115 hp top piston has metal plate over plug hole???

That 1975 1150 probably has distributor Thunderbolt because he mentions buying a timing belt so there is no under flywheel trigger.
 

Wdr

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Re: 1970s 1150 mercury 115 hp top piston has metal plate over plug hole???

the motor does have thunderbolt ignition
 

Wdr

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Re: 1970s 1150 mercury 115 hp top piston has metal plate over plug hole???

it has come time to clean the cylinder wall which has some aluminum build up on it. i was told by a mechanic to use muratic acid to eat the aluminum away. my question is would that block have a nickel silicon coating it is the ctlinder wall just aluminum?
 

mr 88

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Re: 1970s 1150 mercury 115 hp top piston has metal plate over plug hole???

Acid is the way to go.. The walls are not aluminum,they would never last if so.
 

Wdr

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Re: 1970s 1150 mercury 115 hp top piston has metal plate over plug hole???

thanks again for your help. ill be cleaning that cylinder up this weekend... parts should be a couple weeks
 
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