Wear on coils?

[baytonemus]

I got the flywheel and magneto pulled off of my '63 40hp 40352D, and I noticed that there is some wearing on the brushes (? contacts? - not sure what these are called) of both coils.



Is this normal or were these improperly positioned by the previous owner/mechanic? My understanding is that there should be a gap between the magnet inside the flywheel and these surfaces. It looks to me like they have been rubbing. I had the guy start the motor before I bought it and it did idle. By the way, I do not have the ring that the factory manual describes that's used for positioning the coils.

Here are a couple of other photos. I've never had these removed before, so I'm not sure what I should expect to see as far as the amount of grease, etc. I figured I'd post them and that maybe someone could give me a heads-up if they see anything "hinky." Thanks!

 

[Daviet]

Re: Wear on coils?

The coils should line up with the bosses on the mag plate, looks like they are a little to close to the flywheel.

 

[wilde1j]

Re: Wear on coils?

Coil laminations should not contact the flywheel. Make sure you torque the flywheel nut when your done.

Clean the crud off the crankshaft taper and the mating bore in the flywheel. Both should be clean and dry prior to assembly.

The only place for grease should be on the points rubbing block.

You make need a special fixture to get the coils properly positioned.

 

[baytonemus]

Re: Wear on coils?

The coils should line up with the bosses on the mag plate, looks like they are a little to close to the flywheel.

Thanks, Daviet. The bosses have a vertical face then taper slightly at the top. Should the coils be aligned with top, tapered edge or the vertical face of the boss?

 

[baytonemus]

Re: Wear on coils?

Coil laminations should not contact the flywheel.

Coil laminations. Now I know what to call them, at least. Thanks.

Is it possible that material may have been removed from the flywheel by this rubbing such that the gap will no longer be correct? If that has happened, then neither aligning with the bosses nor using a coil locating ring will produce proper positioning, right?

Make sure you torque the flywheel nut when your done.

I've been wondering about this step, too. As much as I had to whack away using the hammer and wrench method to get the flywheel off, seems like torquing might be even harder. Do I need like a professional wrestler to basically get the thing in a headlock while I torque?

What about fabricating a bracket that would attach to one of the recoil mounting bolts on one end and one of the flywheel ring gear bolts on the other? I've done this on my van when I needed to remove the water pump pulley (or something similar, I can't quite remember).

Clean the crud off the crankshaft taper and the mating bore in the flywheel. Both should be clean and dry prior to assembly.

Check. Planning to use lacquer thinner for this. Also, could the whole flywheel go into a parts washer prior to that step? Any potential damage to the magnet?

The only place for grease should be on the points rubbing block.

...as supplied in the little capsule that came with the tune-up kit!

You make need a special fixture to get the coils properly positioned.

I looked at those locating rings but it appears they run about $50??? I'm honestly not sure how often I'm going to need that, so dropping that much money on the tool is not my first choice right now. After I've needed a tool at least a couple of times, then I'm usually more persuaded that buying it is justified. Maybe they're available for less...

Thanks!

 

[ezeke]

Re: Wear on coils?

Getting the alignment right at both ends can be easier with the ring, but you can use a straightedge and get it right.

http://www.iboats.com/Johnson-Evinr...4687278--**********.436164490--view_id.336097

 

[baytonemus]

Re: Wear on coils?

Getting the alignment right at both ends can be easier with the ring, but you can use a straightedge and get it right?

Well, the thing is, those coil laminations were not protruding past the edges of the bosses. Both the ring and the straightedge methods won't align them back any further than they were positioned when I took the mag off, right. I suppose they may have been out a little too far and then were planed back a bit.

 

[F_R]

Re: Wear on coils?

If they are not protruding, but still are rubbing, then the mag plate is worn and sloppy loose. Or something like that.

If the coils are even with the machined posts on the plate, they should not rub.

The magnets are virtually indestructable, so washing them won't hurt.

A little creative use of a screwdriver will hold the flywheel while torquing the nut. Don't tell anybody I said that.

 

[baytonemus]

Re: Wear on coils?

If they are not protruding, but still are rubbing, then the mag plate is worn and sloppy loose. Or something like that.

If the coils are even with the machined posts on the plate, they should not rub.

The magnets are virtually indestructable, so washing them won't hurt.

A little creative use of a screwdriver will hold the flywheel while torquing the nut. Don't tell anybody I said that.

Thanks, F_R. I suppose that it's also possible that someone installed those coils improperly and, when it was very difficult to turn over (and he heard scraping sounds), he opened her back up again and repositioned the coils.

Can I ask again whether the coils should be flush with the front face of the boss/post or even with the top of it where it tapers back slightly?

 

[F_R]

Re: Wear on coils?

The front face. Ignore the chamfer.

 

[1946Zephyr]

Re: Wear on coils?

I usually use a utility knife blade to line the coil faces with the machined bosses and my coils work great everytime. Make sure that the blade is 100% flat on the coil face and there is absolutely no gap to be seen on the coil face.

 

[baytonemus]

Re: Wear on coils?

Here are a couple of photos of the underside of the flywheel. Doesn't look too bad to me but, as I demonstrate here on a daily basis, I'm no expert.

 

[baytonemus]

Re: Wear on coils?

Align with the front face of the boss. Got it!

Thanks, guys.

 

[bktheking]

Re: Wear on coils?

That flywheel should still work.

 

[F_R]

Re: Wear on coils?

I'm thinking two things:

1. Possibly correct, it is an old wound, since corrected.

2. Something is mighty loose and flopping around. Armature plate? Main bearings? I mean, it is hitting the area apart from the magnets??

 

[baytonemus]

Re: Wear on coils?

I'm thinking two things:

1. Possibly correct, it is an old wound, since corrected.

2. Something is mighty loose and flopping around. Armature plate? Main bearings? I mean, it is hitting the area apart from the magnets??

I spent some time looking this thing over. The scoring that is below the magnets (above them when the flywheel is installed) may have happened when the magnets were originally milled. At least, it looks like that's how they manufactured the flywheel - an aluminum casting with the magnets, then machining to spec??

As for the bearings, when I grab the top of the shaft and pull back and forth on it hard I do feel a very slight bit of movement and a light clicking. It doesn't seem like a lot but, of course, I'm not a mechanic. Maybe that's normal on a motor this old.

 

[14ftgrumman]

Re: Wear on coils?

Worn bushing in mag plate or worn upper crank bearing. See if you have any side play with the crank.

 

[baytonemus]

Re: Wear on coils?

Worn bushing in mag plate or worn upper crank bearing. See if you have any side play with the crank.

Thanks for your reply, 14. How would I check for that beyond what I've done already?

 

[baytonemus]

Re: Wear on coils?

Pertaining to the upper crank bearing, the feel and sound are pretty similar whether I'm pulling the shaft from front to back or from side to side.

Should I remove and clean under the armature plate support and retaining ring? It feels pretty gummy under the latter. Also that retaining ring is completely free under the aps when the mag is removed, is that correct?

 

[14ftgrumman]

Re: Wear on coils?

Set up a dial indicator and see what side to side play you have, then try to find out if it is excessive.

If there is that much goo under the plate, the upper seal might be bad. Was it giving you the "lean sneeze"?