57’ Johnson RD-19 35-hp Electric Convertion

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    Daniel Ziff

    US Member - 1 Year
    Replies: 5
    Topics: 1
    #232956

    I have restored a 1957 Johnson RD-19, 35-hp outboard and am trying to covert it to an electric start because the compression is so good. I don’t have the strength to “pull start” it. It pulls easily with the plugs out. I thought I purchased all the component parts; starter & bracket, ring gear, original electrical box, solenoid, ignition switch and wiring harness. But even though the motor and bracket readily affix to the motor, the starter pinion gear on the starter looks like it would never clear the ring gear. The bracket also does not have a place for the cowling stud. I am also not sure whether the ring gear mounts below or above the flywheel. There are other functional motor linkages that the ring gear would interfere with if mounted below. Starter pinion would not reach if mounted above. The electrical components are good, but I think I was sold the wrong motor & bracket, may ring gear too, not sure.
    Any wisdom or experience out there would be a god-send. I have restored a 1957 Dundee mahogany lake boat from Finger Lakes whose original motor was this same Johnson Big Twin. Going on 3-years of restoration work. Ready to put in the water if I can get this motor running!

    bobw
    bobw

    US Member - 1 Year
    Replies: 1349
    Topics: 45
    #232960

    I did an electric starter conversion on a ’56 Johnson RD-18. If it helps you visualize any, here’s a few shots of my starter/flywheel arrangement during the assembly process. Yours should look fairly similar. Sounds like you have an Evinrude starter bracket without the cowl pin but it should work. The correct Johnson starter bracket would be part #376885. The ring gear mounts on the underside of the flywheel.

    Flywheel-Installed

    Starboard-View-of-Starter

    Completed-Powerhead-Starboard

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20
    1957 Evinrude Fastwin 18

    "Every 20 minute job is only a broken bolt away from a 3-day project."

    • This reply was modified 1 month, 1 week ago by MumblesMumbles.
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    frankr
    frankr

    US Member - 1 Year
    Replies: 5620
    Topics: 49
    #232982

    Daniel, it sounds like you have the thicker ring gear used on some newer models. The ’57 Johnson 12V starter bracket with cowl pin was only used on 1957-58 Johnson RD-xx models. Pre-1957 was for 6V starters.

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    Casey Parr

    US Member - 1 Year
    Replies: 14
    Topics: 5
    #233027

    I’m doing the same to my RDE-17 25hp johnson. Someone might have already took your original parts and swapped them to a 25hp. Gave you thier originals. What is your part numbers and I can tell you what came off my original 25hp.

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    Casey Parr

    US Member - 1 Year
    Replies: 14
    Topics: 5
    #233028

    Oh forgot to add that all my conversion parts came from a 57 35hp. That’s why I ask to check your parts to see if someone else back in the day gave your engine a twice over and stripped of the 25 conversion. Then donated your 57 with the old 55 parts. The 57 bracket is the only one plus the flywheel where a 55 can be converted. So lots of ppl want it BAD.

    outboardnut
    outboardnut

    US Member - 2 Years
    Replies: 747
    Topics: 339
    #233051

    Out of curiosity- what are the casting number on the ring gear?
    Also what are the casting number on the flywheel?

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    Daniel Ziff

    US Member - 1 Year
    Replies: 5
    Topics: 1
    #233244

    Bob,
    Thanks for your reply to my post about my 1957 RD-19. Your motor components look a bit different than mine. The starter bracket is different. Your air intake shape looks different than mine. The housing over the flywheel looks quite different. I tried to attach some photos of my motor, but the files are too big. How did you “scale” your photos to fit within the he parameters.
    I’m not sure how much help your photos are goin to be with my motor.

    Dan Ziff

    bobw
    bobw

    US Member - 1 Year
    Replies: 1349
    Topics: 45
    #233247

    Daniel,
    Yes, your motor is going to be and look different simply due to design changes between the ’56 30hp and your ’57 35hp. Not sure what type of computer/software you have for your photo files. On my Mac, I just got under Preview Tools, hit “adjust size” and change the photo width/height to reduce it if it’s too large.

    I provided my photos thinking it might help you visualize how yours might look. It’s not going to be an exact match.

    Edit – the starter bracket on my motor came off a ’57 Johnson. It can mount either a 6v or 12v starter and when I did the conversion, I wanted to go with 12v. As Frank R noted, sounds like you might have the wrong ring gear and/or bracket.

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20
    1957 Evinrude Fastwin 18

    "Every 20 minute job is only a broken bolt away from a 3-day project."

    • This reply was modified 1 month, 1 week ago by bobwbobw.
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    Daniel Ziff

    US Member - 1 Year
    Replies: 5
    Topics: 1
    #233313

    Frank,

    Sorry for my delayed reply to your comment. I think you are absolutely right. I bought what was represented as a complete electric conversion for my motor on eBay. I think the seller may have overstated the models/years that his kit was compatible with. I hope it was an honest mistake. The solenoid and wiring harness are still good. I have taken some photos of the new (incorrect?) bracket missing the cowl pin. I am not sure if the starters themselves are interchangeable from the brackets?

    As soon as I can figure out how to reduce the “footprint” of photos some I can send them, I will.

    Dan Z

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    Daniel Ziff

    US Member - 1 Year
    Replies: 5
    Topics: 1
    #233314

    Casey,

    I was fortunate enough to buy my antique boat and motor from the original owner. Everything is factory original.

    Dan Z

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    Daniel Ziff

    US Member - 1 Year
    Replies: 5
    Topics: 1
    #233315

    The casting number on the ring gear is “203,486”. It has an “S” in a circle beside it. I will have to take a few things apart to get to the existing fly wheel. I do know it is original because I bought the boat from the original purchaser. Because the ring gear is so thick, the starter pinion would still be in “interference” with the gear in its retracted position.

    Once I compress some photos I took, I will send some.

    Dan Z

    outboardnut
    outboardnut

    US Member - 2 Years
    Replies: 747
    Topics: 339
    #233316

    What I am about to write is to the best of my knowledge.
    I have done some research into casting number on flywheels because
    I’m going to need a flywheel for my 12 volt electric start conversion on a 1955 25 hp RD-17
    I will be using starter bracket 376885 (has point for hood)
    These are the casting numbers that I think will work for you.
    I don’t know which ones will accept a generator belt
    ring gear 203486
    Flywheel 580190
    Flywheel 580177
    Flywheel 580336
    Flywheel 580233
    Flywheel 580285

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    Casey Parr

    US Member - 1 Year
    Replies: 14
    Topics: 5
    #233600

    Daniel, that’s amazing! You have an original engine from the original owner. That’s kinda rare I’m sure. If you’re missing the stud then that bracket is evinrude. You will need the parts off of a 57 35hp. Very hard to find the 12v bracket tho. When you do find it, it will NOT be cheap. The flywheel is 580177. But like outboard nut says. There’s several flywheel that will work. The starter bracket is the problem. Has a small hole for 12v. Big hole for the 6v. The 6v brackets are easy to find. I had trouble finding a 6v starter or I would have used one. Just one spin on the 6v with a 12v system will last a while. But the part number for the bracket off the 57 is 376885 just like he says. It will not be cheap. If you can’t find one in a few weeks let me know. I can take mine off and go have one run thru the CNC machine here locally. But I have no idea what they will charge. It would be cheaper to modify a 6v or the one you have probably. Can you find the part numbers on your brackets and pull the flywheel for that number? Would help a lot. Thanks!

    outboardnut
    outboardnut

    US Member - 2 Years
    Replies: 747
    Topics: 339
    #233602

    Casey-Have you taken 6 volt starter bracket and put it through a CNC before?
    It would have to be able to accept a 12 volt grommet.
    Very interesting fix.

    Avatar
    Daniel Ziff

    US Member - 1 Year
    Replies: 5
    Topics: 1
    #233792

    Casey & Outbboardnut,
    I really appreciate your supplying information about my conversion! I just checked my flywheel number and it is #580191. So it appears that I not only need the correct ring gear, but I need the right flywheel as well. The ring gear I received from this “OMCman” in the conversion package I purchased on Ebay has a number 203486. The starter and bracket are #30508. So if I understand things correctly, I still need to find the correct Flywheel, Ring Gear, Starter & Mounting Bracket. The one thing I do have that I can use from the “conversion kit” is the starting solenoid and ignition wiring.
    I do have a few other questions:
    Are any of starters interchangeable with the different brackets?
    If I just use a solar battery charger to charge the battery when not in use, do I really need a generator? How many “starts” can one expect on 1-charger on a good battery?
    Where is the best place to find the parts I need? This site is a great venue however are their other options?
    I know these parts are somewhat rare, but I am so close to the finish line on this 3-year restoration that I can’t let a few more dollars stop me.
    The idea of using a CNC machine if all else fails is a great idea.
    I am still trying to find a way to reduce the size of my photos taken with my “iPhone”. My laptop uses Microsoft “Windows”. I have many photos I would like to share.

    Thanks again, Dan

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