1975 40hp Info needed

[TAC_Double]

Hello,

Just picked up this pontoon with a 75 40hp evinrude, model 40555C. I am going to be freshing up this motor, been sitting for a while. I have ordered the factory manual to aid in this. But in the mean time can anyone give me a little info on this motor?

I am looking for the following info,

1. Recommended spark plugs and plug gap.
2. Recommened gear fluid for the bottom end.

Thanks for any help you can supply!

 

[OBJ]

Re: 1975 40hp Info needed

Welcom Tac!

Spark plug is a Champion UL81C set at .030.

Gear lube, lot of the stuff out there. Just make sure it's for mechanical shifts and not electric. Your local J/Rude dealer would probably recommend Hi-Vis or Ultra Hi-Vis.

Fuel mix is 50:1....16oz oil to 6 gal of gas. Make sure the oil is TCW-3 rated.

You may also consider replaceing the water pump impeller (or get a pump kit and replace the whole thing) and t-stat.

 

[TAC_Double]

Re: 1975 40hp Info needed

OBJ,

Thanks for the fast response. That was the info I needed. Now I have another question, how hard is it to access the impeller? I have looked at the parts sheets and it does not look like a terrible job, but i have never done it before.

 

[tashasdaddy]

Re: 1975 40hp Info needed

here's some good info
http://forums.iboats.com/showthread.php?t=158086