That was the last year for the bronze bushing on the wrist pin.------The 61 to 63 models used a needle bearing.--------Same needle bearing as was used on the 20 / 40 HP and also on a V-4 model 125 HP.------In my humble opinion that bearing is cosidered " robust " for the 10 HP-----So check it out if it was a regular runner for slop in that bushing.----It will rattle at idle if bad.--------If it sat around it may well be OK there.-----Bonus----The later rods and pistons with the improved bearing will swap in.
That was the last year for the bronze bushing on the wrist pin.------The 61 to 63 models used a needle bearing.--------Same needle bearing as was used on the 20 / 40 HP and also on a V-4 model 125 HP.------In my humble opinion that bearing is cosidered " robust " for the 10 HP-----So check it out if it was a regular runner for slop in that bushing.----It will rattle at idle if bad.--------If it sat around it may well be OK there.-----Bonus----The later rods and pistons with the improved bearing will swap in.
That is all very true, and probably what I would have said. It might also be added that a very large proportion of the wrist pin slop comes from excessive wear of the pin-to-piston fit. That's why the pistons must be replaced along with the rod and bearing if doing the upgrade (new pin is larger diameter, giving more surface area in the piston pin bore).
BUT, don't let us scare you off. If the wrist pins are not battered out, it can give you a lot of good running, if the rest of the motor is in good condition. ALL OMC motors of that era need new coils if they haven't already been replaced. It is a simple procedure to check the wrist pins for wear.
Remove both spark plugs. Stick a screwdriver in one of the holes & touch top of piston with it. Slowly rotate the flywheel and follow the piston with screwdriver (Don't Push!). When piston reaches half way down the stoke, stop rotating the flywheel. Now give a push on the screwdriver. If you feel a clunk, the wrist pin is loose. Amount of clunk is related to amount of looseness. Repeat with other piston.
Ok thx. One other question.. If this motor is in good shape, how would it compare to a 1984 evinrude 9.9 that I have. I guess my question is which one would you prefer to own? Thx
Did you pick up the '60? I run a '57 10 as well as '82 and '84 9.9s. Kind of apples and oranges. Might check compression and spark on the 10, if you can, and get some history. I enjoy working on and running the older points models, so kind of depends on what you like.
No sir I didn’t pick it up. Backed off of it. I have a 9.9 and 7.5. I really was gonna buy it out of shear boredom. Just give me something to do. Ha ha
