1972 100hp

[SuzukiChopper]

I just bought my first boat, it came with a 1972 Johnson 100ho motor. It's a real pain in the butt manually lifting and dropping the motor every single time I launch or want to beach my boat. I have a line on a power tilt/trim unit from a 1976 140hp (I know a 1976 100hp will accept the same unit). I was told by the dealer that this unit will absolutely NOT work on my motor, not matter what I do. I'm having a tough time agreeing with him and think that with the transom mounts from the '76 unit, I can make this work. Anyone have any thoughts on this? ideas? opinions? I was also thinking that the manual rams could be converted to power hydraulic rams, alas I don't have any hydraulic experience though.

 

[papad1947]

Re: 1972 100hp

Originally posted by SuzukiChopper:<br /> I just bought my first boat, it came with a 1972 Johnson 100ho motor. It's a real pain in the butt manually lifting and dropping the motor every single time I launch or want to beach my boat. I have a line on a power tilt/trim unit from a 1976 140hp (I know a 1976 100hp will accept the same unit). I was told by the dealer that this unit will absolutely NOT work on my motor, not matter what I do. I'm having a tough time agreeing with him and think that with the transom mounts from the '76 unit, I can make this work. Anyone have any thoughts on this? ideas? opinions? I was also thinking that the manual rams could be converted to power hydraulic rams, alas I don't have any hydraulic experience though.

 

[papad1947]

Re: 1972 100hp

SuzukiChopper,<br /><br />Did you determine if the 76 tilt/trim unit would work on your 1972 100hp Evinrude? I have the same engine and would like to add tilt/trim.

 

[SuzukiChopper]

Re: 1972 100hp

Hey,<br /><br />Well I purchased the tilt/trim unit off of a 1976 johnson. It's not a direct bolt in but after some measuring and thinking, I went and purchased the transom mounts along with the midsection for a 1976 also. I believe the motor will fit the midsection off the '76 and if it does then the tilt/trim will work perfectly. I'm still waiting on the parts to arrive and if it doesn't snow too much or get any colder then I'll probably be making the swap. If it works I'll definately let you know!!

 

[R.Johnson]

Re: 1972 100hp

If you have the entire midsection from the 76, it will bolt up. Besides having tilt/trim, you will have the tilt tube steering. I did this with my 72, 125.

 

[SuzukiChopper]

Re: 1972 100hp

Awesome!! That makes me feel better about spending a couple hundred dollars on this stuff. was never sure if it would work but had a good idea it would. Thank you for letting me know!!

 

[DJ]

Re: 1972 100hp

Below is an outstanding option. New, warranted with great product support. Available here on iboats.<br /><br /><br /> http://www.iboats.com/mall/index.cgi?prod_id=13581&current_category=cmc&*******=472750607

 

[SuzukiChopper]

Re: 1972 100hp

The PT-135 is fine but once you calculate shipping to Canada, exchange, duty, etc,etc it works out to close to $1200... whereas I ended up spending about $200 for the system off a '76, e-bay is wonderful. The boat I bought isn't even worth $1200 so it's out of the question.

 

[R.Johnson]

Re: 1972 100hp

If you get hung up on anything making this switch, let me know. As I pointed out, gaining that tilt tube steering is another plus. It makes rigging much easier.

 

[papad1947]

Re: 1972 100hp

Please keep us posted on your project. It sounds like you have the same situation I have. I only paid $900 for my boat, motor, and trailor, so I hate to spend half or more again on just tilt/trim. What you are doing is what I had in mind, but I don't know enough about boat motors to know what will interchange. Good luck!

 

[OBJ]

Re: 1972 100hp

You probably will need the swivel bracket also. It has the boss' for the the tilt pin.

 

[SuzukiChopper]

Re: 1972 100hp

That's part of the midsection. I only got the transom mounts, swivel bracket and the steering tube with the top mount for the midsection. I'll have to use the lower mount that I already have or swap out the steering stem I guess. Just hoping all the parts get here before it gets really cold out

 

[SuzukiChopper]

Re: 1972 100hp

Yeah I know absolutely nothing about boat motors as well, and was told by MANY MANY people that there is no way this could work. Well that right there is a challenge, one I was willing to take (especially to save my back *laugh*) and if I can help out atleast one other person by confirming this works then I'm down for it.

 

[SuzukiChopper]

Re: 1972 100hp

Originally posted by R.Johnson:<br /> If you get hung up on anything making this switch, let me know. As I pointed out, gaining that tilt tube steering is another plus. It makes rigging much easier.

Okay I got hung up!! The first problem I ran into was the fact that the two "horns" coming off the stearing arm for the upper motor support don't line up, they're about 1/16" wider. This will be realy easy to fix. Now the next problem is the splines and threaded portion for the lower motor support are 1/4" bigger then the '72 lower motor support. The spline portion on the mount looks pressed in so I was going to press it out and find a fitting that mates up to the shaft, but I'm thinking it's going to be easier to cut the splines off my old stearing shaft, cut the splines off the newer stearing shaft, and TIG weld the old to the new so that the lower mount fits. I also thought about just replacing the stearing shaft in the new setup with the old one, but I can tell if the new one can be pressed off or not. Almost looks like the splined portion at the bottom was inserted, then the stearing arm welded to the shaft at the top. Any ideas???? <br /><br />Other than these two minor things it's gone pretty well so far, and once this is sorted out it will work. So I'm getting happier Also buying a Dodge Durango tomorrow to pull my boat with and getting rid of the 4cyl saturn

 

[skyguy59]

Re: 1972 100hp

You are now answering my biggest question. Can the steering shaft from the 72 swivel bracket be made to work in the later swivel bracket? You would think it could be pressed out and the other shaft pressed in. On might have to make bushings if the diameters were different. Good luck and please make sure you post your results.<br /><br />Russ In Texas

 

[SuzukiChopper]

Re: 1972 100hp

I'm going to go get both swivel brackets from storage today and have a better look at both of them. I never looked really hard at the new one when I received it because they both "looked" the same. I'm kind of hoping that maybe there's a c-clip holding the steering arm into the new bracket and if that's the case I can probably get two brass bushings the right size to make it all work. I'll be posting later tonight!

 

[Mercathode]

Re: 1972 100hp

Have you priced a tilt unit from someone like CMC or others who offer a aftermarket tilt/trim?

 

[SuzukiChopper]

Re: 1972 100hp

yeah $800cdn compared to the $250cdn that I did spend. Out of my range. <br /><br />Today I worked on the conversion a bit more. Needed bushings to make the old stearing stem work with the new swivel bracket. So I went and picked up 10" of 2" nylon to machine for bushings. The top bushing is a nice tight fit at 2" o.d. and the lower is a good fit at 1.5" o.d. The steering shaft itself if I remember right is something like 1.1884" or something like that. The just used the old top nylon bushing for measurements and all went well. Went to put the lower mount on and more problems. Because the new swivel bracket body comes down further (without the "stem" protruding), I'm going to have to do some modifications to the swivel bracket as well to make the lower mount fit. Nothing a grinder won't fix. I only need about 1/2" to an inch more room to get the lower bracket on. Once I have this then it's all over and the '72 will be mounted to the '76 power tilt and trim. I'll try and get some photos of what I had to do to make it work. A few hours and some machining (or about $50 and nylon at a machine shop if you don't have access to a lathe) and it really isn't that bad of a conversion.<br /><br />I'm hoping by Sunday everything is all said and done and I have some pictures to show the work that had to be done.

 

[skyguy59]

Re: 1972 100hp

That sounds pretty good. Since I have access to a really good machine shop, sounds like this will be pretty easy. Are you going to be able to mill the new swivel bracket to the same length as the old one and still have room for the bushing? Why did you pick nylon for the bushings as opposed to bronze oilite? Looking forward to your pics. <br /><br />Russ In Texas

 

[SuzukiChopper]

Re: 1972 100hp

I'm not going to mill the swivel bracket because the mill I can use isn't big enough. I'm going to use the good old angle grinder to fit it. I don't see a problem with the material that needs to be removed to make the old mount work. The two lower pin stops (not exactly sure what they're called but the rest against the pin if you have just a manual tilt) and some of the extra casting needs to be removed and then the tube that goes around the shaft needs some material taken off. The lower bushing will go as far up as it needs to, but isn't going to need to be moved at all. <br /><br />The only reason why I used the nylon instead of the bronze is because I got a 2" nylon blank and was considerably cheaper then the bronze blank. The bearing and transmission place where I live is about the only place to get bushings and they never had anything close to what I needed. So for machinability, and cost, the nylon is a good choice. From the factory it's the same material that Johnson used on the stearing stem anyways so it should last quite a while.<br /><br />Pictures should be coming really soon.