picked up some little 60s/70s Johnson/Evinrude 3 and 4hp short shafts

[film495]

picked up two 4hp and a 3hp, the ones on each end are the 4hp, trying to go over and really figure out what I got. I have a 1968 3hp Evinrude, so - my theory was these would be similar enough to maintain. didn't find a model number on the one on the right yet

left to right
Jh23M
4W71D
4336c, maybe

what is with the propeller on the one on the right? seems like it is designed like that, just never saw one pointed down like that before.

 

[tphoyt]

I believe the one on the right is know as weed less.

 

[Crosbyman]

yes weedless... all great kickers easy to maintain well covered in the Johnson service manual !

great find !!

 

[film495]

I have what I think is a factory service manual for a 1968 Evinrude 3hp. Wonder if that covers enough to maintain all these.

Anyone know if these all share parts, ignition, coils, carbs. are the 4s that much different than the 3s?

I looked up the stamped model numbers, and came up pretty close. I'll have to check this again, but this seems reasonable. but left to right that doesn't match what the motors are so, I think I messed something up.

Jh23M, JH-23 1968 3hp Johnson
4W71D, 4w71 1971 4hp Johnson
4336c, 4336 4hp 1973 Evinrude

 

[Crosbyman]

not much to service other than GC oil carb jobs if needed simple non-shifting engines. some pulll starter recoils are tricky and magnetos are easy to fix up and you should pull all 3 FW to inspect for cracked coils, replace possibly bad condensers and clean up/or replace the points
checl plug wires for cracks or just change them all with 7mm copper/metallic strand wire ( no carbon fibers)

lots of utubes for you ... personnaly I prefer the 4hp.

 

[racerone]

I was surprised that the 73 model uses the 2 HP lower unit.-----The 4 HP uses a different crankshaft.-----More metal on it to take up space in the crankcase.-----Little better scavenging results in more power.-----The weedless drive was common from the late 1940's .-----Used for many years !

 

[film495]

Jh23M, JH-23 1968 3hp Johnson
4W71D, 4w71 1971 4hp Johnson
4336c, 4336 4hp 1973 Evinrude

I do think this is the correct models and years.

90, 94 compression on the 68 3hp Johnson
93, 93 compression on the 71 4hp Johnson
90, 94 compression on the 74 4hp Evinrude

Which seem decent enough. I bought them all running. I think I'll check/swap the lower unit gear oil, and see about running them on a boat to see how they do. I ordered some new plugs. I'm sure they'll need a bit of tinkering.

I've never taken the flywheel off of one of these, to get at the ignition points/coils etc. Is there a trick, or a common puller that is good for that. The guy I picked them up showed me how easy it is to get the nut off, but I'm not sure I have anything in my garage that would fit these.

 

[film495]

71 4hp Johnson had what looked like almost fourescent milky yellow gear oil in the LU. Pulled prop, just drained it and put screws back in until I figure out next step.

68 3hp Johnson, not milky, but very thin gear oil, drained it and filled with new.

73 Evinrude 4hp, no idea how to change gear oil. Seems like there is only 1 screw. gonna have to look it up.

 

[racerone]

On the 73 you remove the screw.----Turn the motor so hole is down.----Oil drains.-----Turn motor so that hole faces up.-----Fill with oil.-----Install plug.

 

[film495]

On the 73 you remove the screw.----Turn the motor so hole is down.----Oil drains.-----Turn motor so that hole faces up.-----Fill with oil.-----Install plug.

thank you. so no weep/fill level hole? how do you know how full to make it?

 

[film495]

Jh23M, JH-23 1968 3hp Johnson
4W71D, 4w71 1971 4hp Johnson
4336c, 4336 4hp 1973 Evinrude

I think the 3 horse is good for a water test. I changed the lower gear oil in it, and took the choke control knob from the other one, it was broken and jerry rigged, not a bad job, but I think that motor is the first one to give it a shot.

The 71 Johnson, I noticed to me, what looks like the end of the crankshaft where the bolt screws onto it is broken off, and the flywheel has 1/8-1/4 of exposed thread, so - I think that just became a parts motor.

I guess I better go drain the gear oil in that one and see what's what, maybe I'll get lucky on 2 out of 3.

 

[racerone]

Not hard to find a used crankshaft.----Not hard to install.

 

[film495]

well, I think this 68 Johnson 3hp is good enough to run the water for 15 minutes or so and see how it does on a boat.

These 2, the one on the left (73 4hp) seems OK enough to consider running. I gotta measure the shaft lenght. Seems like it might not be a short shaft 15" to me, but I didn't meausre it yet. Hopefully, out of these 2 I can get a fully functioning little outboard. The on on the right is a 71 4hp Johnson, it ran in a tank, but it has some issues. The lower unit was very milky when I drained it, and it looks to me like someone broke the top of the crankshaft off when they were pulling it or who knows how you do something like that. So, I think it is a parts motor.

 

[film495]

yea, the shaft is 2-3 inches taller. I measured it, and now looking at it you can clearly see the cavitation plate is a good bit lower in reference to the lower edge of the side of the trailer they're hung on the same way.