1979 merc 115hp

[spaceghost]

question, my inline 6 has a compression of 125 on all cylinders but one #2=25comp, is this motor still operational in the water? also can i get a rebuilding kit for the trim/tilt motor? wher? thanks

 

[spaceghost]

Re: 1979 merc 115hp

help 115hp mercury questions.

 

[briannh1234]

Re: 1979 merc 115hp

25 is very very low. Does the engine start? If you can get it started and it's not making any horrible noises, you can try a can of mecury power tune, which may free up a stuck ring. Past that I would guess that you need to rebuild it. <br /><br />When is the last time you cleaned the carbs on that motor?<br /><br />Good luck<br />- Brian

 

[spaceghost]

Re: 1979 merc 115hp

yes motor starts and runs good. its been setting for 3yrs, maybe it just needs cleaned . I just cleaned all 3 carbs like new...

 

[jimmbo]

Re: 1979 merc 115hp

Which cylinder is pooched? the top one?

 

[spaceghost]

Re: 1979 merc 115hp

i believe itss the 2nd 0r 3rd cylinder..

 

[spaceghost]

Re: 1979 merc 115hp

ok thanks...ill try it out......can i get that power tune at any boat dealer??

 

[Clams Canino]

Re: 1979 merc 115hp

I'll bet it's the third.<br /><br />Try the power tune... past that it needs to come apart.<br /><br />-W

 

[jimmbo]

Re: 1979 merc 115hp

Ok Clams, what is it about the third hole? I thought the top 2 were most likely so melt.

 

[emckelvy]

Re: 1979 merc 115hp

Power Tune is Merc stuff ?no? Check with the dlr.<br /><br />If you don't have a Merc dlr in the area but do have a Johns/Ev dlr, try some OMC Engine Tuner. It's also a strong decarbonizer. Or pick up a can of Seafoam Deep Creep decarbonizing spray at your local auto parts store.<br /><br />Re: Jimmbo's Ques, #1 and #3 cyl's usually get it but any cyl can fail.<br /><br />IMHO Lotsa Luck getting a 25-psi cyl back with decarbonizer. My bet is, the rings are probably fried and the motor will need to come apart.<br /><br />You can remove the upper intake port cover and take a look at the intake side of the piston, also you'll be able to see the cylinder wall on the exhaust side, that should tell you quite a bit.<br /><br />Good Luck.........ed