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Author Topic:   slipping motor
jaydelmonte posted 11-04-2002 05:02 PM ET (US)   Profile for jaydelmonte   Send Email to jaydelmonte  
My 1978 Johnson 35 h.p.(on 13 sport)is staring to slip real bad at speed and on acceleration. It sounds like the motor kicks out of gear, but then when I slow down it is okay again. My mechanic says could be a bad lower unit or slipping prop. Any way to easily tell without disassembly?
weekendwarrior posted 11-04-2002 05:17 PM ET (US)     Profile for weekendwarrior  Send Email to weekendwarrior     
If you think it could possibly be the prop then try to get your hands on a second prop to test or have the hub checked by a prop shop. Also check the shift cable to make sure it's putting it all the way into gear.
If you're hearing the clunk (as if it's really being taken out and put back into gear) and if the cable is adjusted OK then my $1 bet is on the gearcase.
JBCornwell posted 11-04-2002 07:02 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
ahoy, Jay.

I don't remember if OMC used rubber hubs that far back, but your description is exactly the symptoms of a spun prop hub.

I guess it could be a broken shear pin, except that they usually go out all the way, not intermittently.

Pull your prop and inspect the hub. If it is rubber have a shop rehub it.

Good luck.

Red sky at night. . .

ratherwhalering posted 11-04-2002 08:05 PM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
I had a similar problem with my 90hp. It was shifting cable adjustment. I just had to adjust if farther into gear, and the problem was resolved. Check all the other stuff mentioned here too though.
Bigshot posted 11-05-2002 09:05 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
They have rubber hubs. BEFORE you start adjusting stuff. Mark the rubber hub and the prop, run it and see if the marks change. If so, you need to have prop rehubbed or buy a new prop. Without a bang or clunk, I doubt it has to do with your gears or cables.....prop.
jaydelmonte posted 11-05-2002 05:26 PM ET (US)     Profile for jaydelmonte  Send Email to jaydelmonte     
Thanks for the thoughts. I have no clunks, bonks or other such noises; only slipping. I am going to mark the hub and head back to the lake for testing.

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