1956 Johnson 15hp Seahorse Resto

[1946Zephyr]

Re: 1956 Johnson 15hp Seahorse Resto

You will need to remove the three 1/2" nuts on the front half, which you'll find above the lower shroud and the five 1/4" slot head screws on the rear half, which you'll find below the lower shroud. You'll most likely find it's a better idea to remove the flywheel and the mag plate, as well as the rest of the accessories, before you remove the powerhead though.

You can actually see what the base gasket looks like, in the exploded diagram, on item #4

http://www.marineengine.com/parts/v...ntage-evinrude-johnson/376748/37674800001.htm

 

[babysdaddy]

Re: 1956 Johnson 15hp Seahorse Resto

I was finally able to get back to the tear down of the fd-10. I took Zephyr's advice by waiting to remove the powerhead from the exhaust assembly until I got the flywheel and mag plate removed. I have not been successful in removing the flywheel. I have used a harmonic balance puller similiar to those described in other posts, but I am unable to get it to release even with a impact driver @ 90psi. I am leary of increasing the pressure. I have soaked the hub with P B Blaster penetrating oil over the past 3 days. I have lightly tapped the hub with a rubber mallet. Does anyone have any other suggestions as they all are welcome. Thanks

BTW Zephyr, I think that I have been bitten by the bug. In addition to the other fd-10 (which is in very good mechanical shape), I have also brought a 1959 jw-15 3hp for $20. It will be fun to have all these engines running, but I am trying to concentrate on one a a time 4 and counting not an addict yet!

 

[1946Zephyr]

Re: 1956 Johnson 15hp Seahorse Resto

$20 for a JW-13 is a deal that none of us would dare pass up. Great find

Don't give up on that flywheel. If you have the puller on the flywheel, you can pry up on the flywheel where the last mounting bolt is for the hand starter and give it a light tap with a hammer.

 

[Tim Frank]

Re: 1956 Johnson 15hp Seahorse Resto

Zephyr is up for cannonization as Patron Saint of 2cyl. OMC's prior to 1970...j/k.<kinda>..if you'll google...duckworks max restoration of 1956 johnson 15hp....his articles might help you as well

Saint Zephyr of Yamhill?....

 

[witenite0560]

Re: 1956 Johnson 15hp Seahorse Resto

I've got the same motor. Mine was last used 25 years ago and has been sitting in my Dad's shed since. Hope to have it going soon. It does turn over and has pretty decent compression. The only thing I can see that's seriously wrong with it is the carry handle is broken right at the throttle twist gear. So, I'll have to remove and replace it or have it welded. Good luck with yours!!

 

[1946Zephyr]

Re: 1956 Johnson 15hp Seahorse Resto

Nahhh, not a saint.....just another beer guzzlin' redneck. It's all good.

 

[babysdaddy]

Re: 1956 Johnson 15hp Seahorse Resto

The flywheel has finally released itself. A word of caution for the rest of the iboats community by all means leave the flywheel nut on during removal because when the flywheel finally released it had some force behind it. I can now resume the tear down. The iginition system actually looks to be in good condition, but I will replace it all during the rebuild. I will post pics soon (I have just been lazy), but I have to "sneak" to work on this project now. I have concerns about the piston rings because they are still stuck. I will be able to better examine the situation once I have the powerhead off. Many Thanks Iboats Community.

 

[1946Zephyr]

Re: 1956 Johnson 15hp Seahorse Resto

If the coils look to have been replaced, then you may not need to replace them now. The newer coils have better coating and are far less prone to failure, than the originals. However, I would replace the spark plug leads and the points and condensors, because it is common to see the original wires, when someone changes out the coils.

 

[babysdaddy]

Re: 1956 Johnson 15hp Seahorse Resto

The powerhead is off the exhaust tower, and I will post pictures of the component pieces today. When I post the pics I am going to try to get some close ups of the pistons. The cylinder walls look pretty darn good, but I am not too sure about the pistons. I will order the impellar, igintion parts, and the carb rebuild kit so that I can get those components completed and out of the way.

1) The lower unit was in very good condition and had no metal shavings and the gear lube was fairly decent. I will change the impellar and top off the lower unit's gearbox.

2) The coils and points appear to be in good condition, but I don't know how to test them without the abitlity to turn the crankshaft. Any ideas? I will replace the iginition system so that it becomes a non issuse.

3) The carb will be cleaned and rebuilt to the best of my abilities (God Bless Us). Seriously, I have done this before on one of my inboards. It just always make me a little uneasy. Trust me I will read and reread every source that I have available to me.

(4) Thinking about not going with the factory paint scheme. I have no idea where I want to go with it, but since I have two of these engines I was just saying. I am going to keep one as close to factory as possible and the other I am open to suggestions and whims.

Well that is the plan,
Oh BTW Zephyr congrats on the new projects and keep us posted.

 

[1946Zephyr]

Re: 1956 Johnson 15hp Seahorse Resto

Oh yea, thanks a bunch. It'll be interesting when it's all done. It sounds like yours was stuck, just from sitting and doesn't have a lot of hours on it. nymarine.ca has a good selection of paints that match factory really well. I'll probably hit them up, if I can't find anything local.

 

[babysdaddy]

Re: 1956 Johnson 15hp Seahorse Resto

I tried to post using photobucket, but I did not like it. I will try to resize the original files and repost that way. Sorry guys.:facepalm:

 

[Chinewalker]

Re: 1956 Johnson 15hp Seahorse Resto

In my experience, if those coils "look" good, then they probably are good. By that, I mean, if they're free of cracks, burn marks, or other damage, it's likely that there is nothing wrong with them. I don't think I've ever had to replace one of these coils that didn't have some sort of visible physical defect.

 

[1946Zephyr]

Re: 1956 Johnson 15hp Seahorse Resto

Yea, I agree. I have found that when past owners change them out, they re-connect them to the old wires without trimming of the ends for a fresh new connection. This usually will end up to a failure, sooner than later.