1986 mercury 150hp info

[coolguy147]

ok got this guy on baseball team he needs he boat fixed up he claims its a 1986 mercury 150hp

hasnt ran in 2 years. need info.

what kind of ignition? hard to work on? clean carb hard? gear case hard to replace impelller? is this efi? motor has oil injection should i disonnnect? if so and how

anything else you can throw on about it easy hard to work on. my farthest experience so far is a 1961 mercury 500. 150hp is a big step for me

 

[coolguy147]

Re: 1986 mercury 150hp info

umm ya i guess this is what im gonna do with the motor

check compression change impeller change gear oil with new gear case seals. check spark. clean carbs if all is good. is this an efi motor?

does this even have a coil?

 

[Jeff_G]

Re: 1986 mercury 150hp info

You probably have a good old carb, ADI ignition motor with 6 carbs. Have the gearcase pressure and vacuumed tested when the gear oil is changed. If you want to change the seals, good idea, you need special tools to disassemble the lower unit.
Removing the oil injection isn't hard and would probably be a good idea on that engine. Replace all the fuel lines and rebuild the fuel pump while you are at it.
Change the thermostats.
Check timing, lube the motor well before starting. Gas/oil mix in a squirt can will be helpful. Spray some in the spark plug holes with the engine trimmed up and turn over the engine by hand to lube the cylinders. Spray more into the carbs to lube the crank and bearings while turning the engine over with the starter in very short bursts.
Clean all your connections, particularly grounds.

 

[coolguy147]

Re: 1986 mercury 150hp info

man little bit more complicated then my mercury lol

what im worried about is i really dont want to replace gear case seals. just tell him to chnage the oil every few round if leaks

 

[coolguy147]

Re: 1986 mercury 150hp info

bump

 

[jeff_smith_0423]

Re: 1986 mercury 150hp info

man little bit more complicated then my mercury lol

what im worried about is i really dont want to replace gear case seals. just tell him to chnage the oil every few round if leaks

Once had a mechanic tell me that after his seal job failed. He never got a dime of my money ever again. In that situation, you're not only dumping gear lube into the water (polluting), it's wasteful, costly, and is eventually going to fry a perfectly resealable L/U.

 

[coolguy147]

Re: 1986 mercury 150hp info

i see hopely no problem