Johnson 9.5 iginition possibly cured

[joho5]

Ok, I have spark on both cylinders. The problem was I had no clue of setting the timing. I had no clue that they operated in line with the pistons. I know that is a big rookie mistake, and I know it is common sense. I figured it out though. So I set the points to open to about .020 - .025 ish as the cylinder is at the top on each individual cylinder. I used the key to set this.

I made a mistake though, over tightened the wobble screw that adjusts the timing on one of the points. It broke off in the threads. So what I did is just put the feeler guage in there and then tightened the main screw and it holds, but now its just a bit tougher to fine tune that point. is there a way I can re-thread that hole? Will it be effective without the wobble screw, it seems to be ok with just the base screw. I dont mind setting it without the wobble screw, but I was just wondering if it would be ok.

I do have a spark on both cylinders though, and thats a good thing. I just didnt understand the concept of "setting the points" initially.

I appreciate all your help guys...now i just have to put the motor back together and try it out.

 

[tashasdaddy]

Re: Johnson 9.5 iginition possibly cured

it may and it may not hold, the worst it would do is leave you with just one cylinder running, to limp home. personally i would try to fix it. i don't like paddling.

 

[joho5]

Re: Johnson 9.5 iginition possibly cured

could this be either filled with metal and then rethreaded or just rethreaded through the broken off screw?

 

[ezeke]

Re: Johnson 9.5 iginition possibly cured

A 3/32 or smaller left hand bit will likely turn it out for you. Once the head breaks off, there is very little tension on the threaded part of the eccentric screw.

 

[joho5]

Re: Johnson 9.5 iginition possibly cured

what do you mean left hander bit? The head did break off and it broke pretty easilly. If you dont mind, describe to me what bit you are talking about so I can get this bad boy taken care of.

thanks for the reply, that is enlightening to know I can probably get that out of there

thanks

Matt

 

[iwombat]

Re: Johnson 9.5 iginition possibly cured

Left handed drill bits - bits that go the oposite way. i.e. They go in with your drill set on its reverse setting.

If you drill the broken part out with a left-handed bit (most threads are right-hand threads) it'll usually just take the broken part of the fastener out as you drill in.

 

[14ftgrumman]

Re: Johnson 9.5 iginition possibly cured

If you are lucky, and I mean IF, you might be able to get hold of the remaining screw with a pair of needle nose pliers or side cutters and unscrew it. I have been lucky a couple of times removing broken screws this way once or twice.

 

[ezeke]

Re: Johnson 9.5 iginition possibly cured

Or: http://www.mytoolstore.com/hanson/hanson.html

 

[joho5]

Re: Johnson 9.5 iginition possibly cured

got it...thanks. are these bits at the usual hardware stores? or lowes / home depot?

i cant grab it with pliers because it is broken down in there. are these wobble screws available anywhere other than evinrude / johnson?

thanks

 

[Sea18Horse]

Re: Johnson 9.5 iginition possibly cured

I wonder if the screw holes for the eccentric screws go all the way through to the other side? One might be able to take the mag plate off and drill it out from underneath with a regular handed drill bit.

I bet once you figure out the size and thread pitch you could easily make one on a grinder out of a regular screw from the hardware store. using the unbroken one as a template. Good luck!

Cheers...................Todd

 

[ezeke]

Re: Johnson 9.5 iginition possibly cured

The holes do go through the plate and you could probably work it out from there if you take the plate off.

 

[joho5]

Re: Johnson 9.5 iginition possibly cured

I will probably do that because from the bottom, the screw will be more flat and easy to get a drill bit on there.

so when adjusting the contacts, are these screws not meant to get tight at all, and just for the adjusting of the points?

 

[ezeke]

Re: Johnson 9.5 iginition possibly cured

There is supposed to be a bow washer between the plate and the head of the eccentric screw. If the head is gone the bow washer will have no effect on the threaded portion.

 

[freddyray21]

Re: Johnson 9.5 iginition possibly cured

I would just see if someone over at aomci.org has a used mag plate. Seems easier to me.

 

[Sea18Horse]

Re: Johnson 9.5 iginition possibly cured

I will probably do that because from the bottom, the screw will be more flat and easy to get a drill bit on there.

so when adjusting the contacts, are these screws not meant to get tight at all, and just for the adjusting of the points?

Correct, If it starts to get tight you want to turn it the other way (counterclockwise) to get where you need to be.

"There is supposed to be a bow washer between the plate and the head of the eccentric screw. If the head is gone the bow washer will have no effect on the threaded portion.

Actually there is a wave washer under the head of the points hold down screw. But nothing under the eccentric screw. If there was it would be under the points plate and make it so it would'nt sit flat. Let us know if you have a hard time finding a screw. I have an extra mag plate here at work. I could send you one of the screws. Good luck!

BTW since the head is broken off there may not be much holding the broken part in there. I'd try working it out with a sharp dental pick first before pulling the plate off.

Cheers.................Todd

 

[ezeke]

Re: Johnson 9.5 iginition possibly cured

I'm sitting at my desk, looking at my spare 9.5 magneto and the 1973 9.5 parts manual #386132. The diagram shows # 17 as the Eccentric Screw #510185 and # 18 as the Bow Washer # 510395 located directly under the screw. That is precisely the configuration that I find on both sets on my actual magneto.

BTW, I also have the 1965 parts manual and it is the same in this regard.

The eccentric screw doesn't sit on the points plate, but rather within it: that is how it moves the plate to adjust the opening of the points.

 

[Sea18Horse]

Re: Johnson 9.5 iginition possibly cured

Ok, so they changed things since the fifties. Fair enough, disregard! :redface:

 

[joho5]

Re: Johnson 9.5 iginition possibly cured

Correct, If it starts to get tight you want to turn it the other way (counterclockwise) to get where you need to be.



Actually there is a wave washer under the head of the points hold down screw. But nothing under the eccentric screw. If there was it would be under the points plate and make it so it would'nt sit flat. Let us know if you have a hard time finding a screw. I have an extra mag plate here at work. I could send you one of the screws. Good luck!

BTW since the head is broken off there may not be much holding the broken part in there. I'd try working it out with a sharp dental pick first before pulling the plate off.

Cheers.................Todd

How much would you rid one of those screws for? I contacted my local guy and he said they are NLA. He cant get them. I know I can probably find someone that has them, but if you would sell me one...I will just do that.

thanks

ps. ill send you a pm about the screw.

 

[Sea18Horse]

Re: Johnson 9.5 iginition possibly cured

BTW, having a wave washer under the eccentric screw serves no purpose whatsoever. What's it waving against?

Cheers...............Todd

 

[Tim Frank]

Re: Johnson 9.5 iginition possibly cured

Might want a second opinion

I contacted my local guy and he said they are NLA. He cant get them.


It is part number 0510185, and is available online at a number of places. Not cheap though...just north of $10-