1963 Johnson Slipping out of Gear

[samuelcosmoschiff]

Hello All... Yet ANOTHER problem with the old motor.

1963 Johnson 75hp V4AL-15E. Tooling around the lake all morning, engine slips out of gear after 30 minutes or so of running wide open. It went back into gear and I was able to limp back to the dock, but as soon as I tried to go fast it slipped out with a series of thuds as if it was trying to stay in.

Using electric shift oil, and it seems to stay in gear at low rpm.

Thanks everyone...

 

[Fleetwin]

Re: 1963 Johnson Slipping out of Gear

All connections are critical with the electric shift engines. That includes both ends of the battery cables. Engine and battery.

You may have a slipping clutch dog in the lower unit but your symptoms sound more like you are losing electrical power.

 

[samuelcosmoschiff]

Re: 1963 Johnson Slipping out of Gear

That's interesting... it is worth noting that when it slipped out at first the amp gauge pegged all the way to the + side.

Will check all connections and report back.

 

[Daviet]

Re: 1963 Johnson Slipping out of Gear

Have you checked the drive pin, have you checked to see if you might have a spun prop hub?
If I remember correctly, those electric shift lower units used a spring and hub to engage the gears, there is no clutch dog in the lower unit. They would shift very smooth. If it is making a thud, look at the drive pin, maybe it's sheared and jumping past the broken ends.

 

[boobie]

Re: 1963 Johnson Slipping out of Gear

Just off the top of my head it sounds like a hub and spring going bad or an intermittent loss of current going to the lower unit.

 

[Fleetwin]

Re: 1963 Johnson Slipping out of Gear

Both of the above are right. I forgot about no clutch dog.

Look closely at the wres going down into the lower unit. A short in one would explain your amp spike.

 

[samuelcosmoschiff]

Re: 1963 Johnson Slipping out of Gear

Unfortunately, I don't think its an electrical problem.... The forward and reverse wires leading to the lower unit are both getting battery voltage when switched.

I thought taking a video might help you guys see what I'm talking about, so check out the link if you can. It shifts into gear fine, but watch what happens when I rev it up... Notice the cover bouncing around.

Thanks again guys.

 

[jimmbo]

Re: 1963 Johnson Slipping out of Gear

Did you check the resistance of the shift coils? 8 ohms normal, wiggling the wires could show an intermitent short or open. Watching the cover bounce, do it a few more times and it will be in the water heading for Davy Jones Locker

 

[samuelcosmoschiff]

Re: 1963 Johnson Slipping out of Gear

I managed to get a donor lower unit from the exact same engine a few towns away. Go figure.

I tore it apart but couldn't figure out how to get the prop shaft off. On the plate surrounding the prop shaft, there are four screws, and two threaded holes. Am I supposed to thread bolts into those holes to push it off? Are there any tricks to taking it off?

If anyone could give me an idea of what to expect / how to further disassemble this thing, I would appreciate it. Thanks again!

 

[samuelcosmoschiff]

Re: 1963 Johnson Slipping out of Gear

Hmm.... Found this picture. I assume the gear in the middle has to be removed first.

 

[Daviet]

Re: 1963 Johnson Slipping out of Gear

Here is a breakdown of your lower unit, maybe it will help you out.
http://www.marineengine.com/parts/j...urer=Evinrude&section=Electric+Shift+Gearcase

 

[samuelcosmoschiff]

Re: 1963 Johnson Slipping out of Gear

That helps immensely! Thanks!