1970 55HP & 60 HP are they interchangable lower units?

[1977jan167868]

I have a 1970 55 HP selectric shift<br />and a 1970 60HP electric shift<br />are the lower units interchangable?<br />and if not are thelower unit oil pumps?

 

[1977jan167868]

Re: 1970 55HP & 60 HP are they interchangable lower units?

I am sure they are 1970-1972 models<br />both 55 & 60 hp is evinrude triumph<br />both are 3 cylinders outboards<br />both are elctric shift<br />both have 13 1/4 X 17 props<br />except 60Hp has larger brass bushing inthecenter of the prop than the 55HP splines are the same size.<br />55HP says selectric on shifter box<br />60hp does not

 

[ledgefinder]

Re: 1970 55HP & 60 HP are they interchangable lower units?

They probably interchange, but it'd help to have the model numbers, to be sure.<br /><br />I don't think they made the 55hp in 1970. I think OMC made the triples as 55hp in 1968 & 1969, 60hp in 1970 & 71, and 65 hp in 1972 & up. <br /><br />They did increase the diameter of part of the propshaft either between 1971 and 1972, or midyear in 1971. As you say, it won't affect your use at all - same prop fits both propshaft. The only difference is when you rebuild them, you need to get a different part number for the seal kit.<br /><br />The swap is pretty easy. Tie something to the electrical leads so it's it easy to pull the new one up through the exhaust housing. It takes me a while to get those wierd splines to line up, so I try to get a second person to help out (turning the flywheel, etc.).

 

[1977jan167868]

Re: 1970 55HP & 60 HP are they interchangable lower units?

O.K. I took the old lower unit off the 55HP<br />it had bad parts in it There is long pin between the sollenoids and what ever with aspring around it the pin is broke.<br /><br />now that the solenoids are bad what about the oil pump where exactly is it?