1958 10 hp Johnson Seahorse throttle pin

PatBlake · Apr 29, 2013

I'm heading over to look at a 1958 10 hp Johnson Seahorse later this afternoon. It was listed at $200 with a tank, but he told me last night the throttle pin fell out and he's dropped it to $120, with a tank. Here's a photo of where it goes:

Any ideas for a fix? I can't seem to find anything online for this part. Will the pin from my 1956 7.5 hp Evinrude work? How do I remove/replace it?
Thanks,
Pat

AlTn · Apr 29, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

those pins are still available from the dealer for ~ $6...be sure to check the lower unit for water...gears, dogs, bushings,etc. are pricey...might as well check compression too so to have an idea what you're getting into

ronboonville · Apr 29, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

might have used my DRILL to make this bolt fit, don't remember, but it took care of the slop.

HighTrim · Apr 29, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

Pat if you get it send me a pm and Ill mail you a proper pin.

PatBlake · Apr 29, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

Thanks for all the replies. The meeting didn't work for today, but I'm heading over tomorrow to take a look. Chris, I'll definitely take you up on your offer if I pick it up. Thanks!

PatBlake · Apr 29, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

Here are some more photos, let me know if you see any obvious issues. I realize the lower unit has been replaced

64osby · Apr 30, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

That has the lower unit extension, will the long shaft fit your boat?

Chinewalker · Apr 30, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

I would avoid the bolt fix as it will chew up the softer aluminum of the gear part. The correct part is easily and cheaply had so fix it right.

kfa4303 · Apr 30, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

Hi Pat. Cool little motor you've got there. I used to have a '61 10hp myself. While you can certainly order the new part from marineengine.com, it costs more to ship it than to buy it :/ I had the same/similar issue on my 20hp and came up with the fix in the pics below. I bacially just used a stainless steel bolt and threaded it into the space the old plastic pin should be. I also replace the old plastic idle adjust screw with a new 1/4" x 20 x 2" stainless steel bolt as well. Here's a pic that may help.

Johnson

PatBlake · Apr 30, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

I picked the motor up today. No plugs and the shift lever was broken, so I got it down to $100. I got it started for about 15 seconds when I got home, but with the pin missing it's pretty tough to figure out where the gears should be.

PatBlake · Apr 30, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

That looks to me like the bolt is coming from inside and is held by a lock nut. Is that correct? How did you manage that?

PatBlake · Apr 30, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

That looks doable. What's the bolt threaded into? It looks like the inside of where the pin goes is plastic, but it's hard to tell. It's definitely not threaded, though.

HighTrim · Apr 30, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

I agree with Scott above. Youll damage the aluminum gear over time. Ill send you the part for free if you promise not to ram a bolt in there! Just PM you address.

PatBlake · Apr 30, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

lol. Done. How does the part stay in there?

kfa4303 · Apr 30, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

kfa4303 said:
Hi Pat. Cool little motor you've got there. I used to have a '61 10hp myself. While you can certainly order the new part from marineengine.com, it costs more to ship it than to buy it :/ I had the same/similar issue on my 20hp and came up with the fix in the pics below. I bacially just used a stainless steel bolt and threaded it into the space the old plastic pin should be. I also replace the old plastic idle adjust screw with a new 1/4" x 20 x 2" stainless steel bolt as well. Here's a pic that may help.

View attachment 191725

Johnson

The upper, smaller ss bolt is threaded into the old plastic base/tab thingy until it just comes out the backside, so it never actually makes contact with the aluminum around it. The longer idle adjust bolt is 1/4" x 20 x 2"-3" with a small nyloc nut on the end to prevent the screw from backing out. You should be able to remove the old, spring loaded, plastic idle set screw which usually gets damaged over time and simply thread in the new bolt. Best of all you can dial the idle in perfectly, snug the nyloc down a bit and forget about it. The new parts are worth it if you're doing a full rest, or ordering other bits and pieces, but they usually cost more to ship than buy.

Chinewalker · Apr 30, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

The bolt will move against the gear and wear into it, making the linkage sloppy. That nylon pin is there as a sacrificial part to allow the lower unit/powerhead assembly to move about a bit within the motion of the shock mounts. Over time that pin wears down and in some cases will shear.

HighTrim · Apr 30, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

Alright I pulled out a parts motor, pulled the pin and put it in an envelolpe for ya. Will mail in the morning.

Disconnect the bracket at the top of the throttle tower, 2 screws, then lift up on the tower, slide the pin in, then drop it back down. Be sure to apply some grease first. Clean up the old grease on the pin, gears, etc...then regrease. Also grease around the throttle tower where it passes through that bracket you took apart.

In fact, every year I like to disconnect all metal to metal connections that move, clean old grease and re grease. Makes for a smooth ride. 50 year old baked on grease does not work all that well anymore.

PatBlake · Apr 30, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

Thanks

Doesn't the pin just slide in through the slot in the lower gear? Or is it installed from the rear? Do you have a photo of what it should look like once it's in?

HighTrim · May 1, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

Yes it slides in, but you cannot slide it in without first lifting up on the tower. It locks in to keep from sliding out. You can slide it in from front or back, no difference.

kfa4303 · May 1, 2013

Re: 1958 10 hp Johnson Seahorse throttle pin

Chinewalker said:
The bolt will move against the gear and wear into it, making the linkage sloppy. That nylon pin is there as a sacrificial part to allow the lower unit/powerhead assembly to move about a bit within the motion of the shock mounts. Over time that pin wears down and in some cases will shear.

Nah

1958 10 hp Johnson Seahorse throttle pin

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