1974 Johnson 25hp - a few questions

[jchurley]

Hello all

I am in the process of trying to get a 1974 Johnson 25 hp to run and have a few questions I am hoping you can help with.

First - I had to take the gearbox apart and am not sure if the clutch dog needs replaced - it's got some wear on it but I've never done this before and therefore don't know if this is normal and acceptable or bad. I've attached 2 pictures showing the sides of the piece - one side has 2 concentric grooves in it and the other side has small "chunks" missing. Given the cost of these I would rather not replace it if it will still work, but I also don't want to put everything back together only to find out it doesn't shift right.

Would you replace this or will it still function? (I have no idea how it was working because among other things, the gearbox was locked up when I got it).




Also - can anyone tell me what the spring in the attached photo is called, what it does, and if maybe it is connected upside down? The problem is that the spring catches against the bolt head as you increase throttle, so I thought maybe it was clipped on upside down. However I've looked through various parts diagrams for this motor and can find no reference to the part, so now I'm wondering if I can just take it off and be done with it.



Thanks in advance for your help.

Joe

 

[Bosunsmate]

i cant comment on the clutch dog but the spring looks like some one has added it to make sure the timingbase returns to its stop as the throttles returned to idle.
You shouldnt need to have that, sometimes the timing bases get sticky due to old grease or loose screws or old cables.
Undo it and see how the base returns to its stop

 

[jchurley]

Thanks - I didn't think it was needed, especially when I couldn't find any reference to it.

Now I just need to have someone tell me I don't have to buy the $100 clutch dog and I'm good to go.

 

[F_R]

That clutch dog is toast. If you continue to use it, it will damage the forward gear and shift linkage---IF it hasn't already. It takes surprisingly little wear to make it jump and bang under load. And every time it does, the damage is multiplied. You think $100 is bad, wait till you price the gear.

 

[jchurley]

Thanks F_R - I kind of figured it would need replaced but wanted confirmation before I just spent the money. For my future reference, what makes it toast - the chipped side, the grooved side, or both? I get that the chipped side is bad, but it seems to me that the grooved side would still work. Of course this is the first clutch dog I've ever looked at, so I could be completely wrong.

Thanks again

Joe

 

[Bosunsmate]

you could try a wreckers yard too