1975 25hp johnson slipping out of gear

[ColdPat]

I have a 25R75B 25hp johnson 1975. This engine purrs like a champ. I clean the carb once a year. I have recently had a problem with the outboard staying in gear. It jumps out of gear when I rev up the engine and then just spins. Question: Should the shifter jump back into neutral? reason: my shifter looks like it is still in gear but yet its out. I do have linkage to a front stick stearing. Could this be a linkage problem? Or do you think it could be the clutch dog. I did take the lower unit apart last week to reseal it but this was happening befor the reseal. I was hoping the reseal would fix the issue? Another question.. If I take the clutch dog out, will the balls in the spring pop out?

 

[jbjennings]

Re: 1975 25hp johnson slipping out of gear

When are you "revving up the engine"----on muffs??? That's not really a good thing to be honest. It could be a linkage problem either in your controls or in the disconnect for the shift rod. It also could be the clutch dog and yes, be careful when removing the clutch dog that you don't lose the little ball bearings. I believe they should stay trapped in the shaft on one side but I've had 'em come out for sure. If it's the clutch dog, you probably won't see a big problem but look for the edges on one side of the dogs--if they're rounded they're no good. You'll probably see the same on the ears of the gears that the dogs make contact with. IF so, you need to get 'em all fixed. A used lower unit might be the cheapest, easiest route.
JBJ

 

[tashasdaddy]

Re: 1975 25hp johnson slipping out of gear

dis connect the shift cable, and put it in gear manually and test it. if it then jumps out. go into the lower unit. but test it before. could be a streched or misadjusted cable.

 

[ColdPat]

Re: 1975 25hp johnson slipping out of gear

Ok thanks... No I'm not that crazy revving up on the muffs. Question: when I take the linkage off and put it in gear if it is the clutch dog will the shift lever go back to neutral because I thinkg it should right.

 

[tashasdaddy]

Re: 1975 25hp johnson slipping out of gear

it may not come all the way back to neutral, will just kick back enough to disengage the gear.

 

[ColdPat]

Re: 1975 25hp johnson slipping out of gear

Another question... I have the rounded clutch dog notches(2) How long should these notches be? How can I tell if clutch dog is bad if the sides come rounded?

 

[wbeaton]

Re: 1975 25hp johnson slipping out of gear

The edges of the lobes on the clutch dog should be a straight 90 deg angle. Any rounding and the dog may/will pop out.

 

[wilde1j]

Re: 1975 25hp johnson slipping out of gear

Looks like you're in for a new set of fwd/rev gears and a clutch dog. BTW, clutch dog failure results from "gentle" shifting. Shifting needs to be done briskly, so you don't hear any clicking while you're doing it, just a thump when it goes into gear.

 

[ColdPat]

Re: 1975 25hp johnson slipping out of gear

My clutch dog is rounded see below pic. With it already being rounded how can I tell

 

[ColdPat]

Re: 1975 25hp johnson slipping out of gear

Also, can I flip clutch dog and forward/reverse gear on this 25hp Seahorse johnson

 

[wilde1j]

Re: 1975 25hp johnson slipping out of gear

If the clutch dog is completely symmetrical, yes. Note that fwd and reverse gears need to be swapped as well. The above is conditional on there being no rounding at all on the reverse lobes of the dog or the machined recesses of the rev gear AND that fwd and rev gears are identical.

 

[tashasdaddy]

Re: 1975 25hp johnson slipping out of gear

"My clutch dog is rounded see below pic." notice the sharp square edges on the top of the clutch dog, these are what has to be square.

 

[johnson691]

Re: 1975 25hp johnson slipping out of gear

does anyone know what the shifting lever conects to? and what the part looks like?

 

[jbjennings]

Re: 1975 25hp johnson slipping out of gear

I believe you can probably flip the clutch dog, but I seriously doubt you can switch the forward and reverse gears. On most of the motors I've worked on they're different. I could be wrong as I've never worked on a '75 model. I hope you can, that would be ideal. I still suspect you're going to be better off with a used lower unit if they're bad.
good luck,
JBJ

 

[johnson691]

Re: 1975 25hp johnson slipping out of gear

i have a old johnson outboard n its has been slipping outta gear> i was looking at the linkage n it kinda looks like a bolt may have wiggled lose n fell out. i put a bolt n the place n have not started or tried it yet. Does anybody know what the linkage looks like n how its to be hookedup? I think that will fix my problem.

 

[67Johnson6HP]

Re: 1975 25hp johnson slipping out of gear

johnson691 - You need to start a new thread. (Include Model # and Year).

 

[wbeaton]

Re: 1975 25hp johnson slipping out of gear

That clutch dog looks good from this side. Might be some slight damage on the other, but it looks ok to me. Double check your linkage.

 

[samo_ott]

Re: 1975 25hp johnson slipping out of gear

That's what I thought. It looks ok to me to. Is that the old one or new one (is that the box behind it?)

 

[jbjennings]

Re: 1975 25hp johnson slipping out of gear

I thought that was a pic of an NOS clutch dog. It looked flawless to me.
If that's actually his dog I'd see if it would hunt, too.
JBJ

 

[ColdPat]

Re: 1975 25hp johnson slipping out of gear

No that wasn't my clutch dog but boy do I have pictures. Took it apart and reversed the clutch dog only. Looks like the gears are different shape on the back end. Here are the pics of clutch dog bad side, then good side, then forward gear, then gear box.