Evinrude Fleetwin 7.5 bad noises

[jlt280]

The inside of the flywheel is banging the lower plate where the coils/points/condensors mount. On this lower plate, there appears to be some type of pad between a raised portion of the lower plate where the coil is screwed on to, and the crank shaft. It appears the pad keeps the lower plate centered while it is rotated by the throttle control. I only have one of these pads in place, I assume there are just two. I don't have a manual or an exploded parts view for this engine. If this is a purchasable part, any info on what it is called (or actual part number) would be appreciated. I was also thinking of fabricating a replacement piece. Does anyone know what type of material that would suffice as I don't want to use anything that would damage the portion of the crank where this materail would ride against. I was thinking of a piece of brake pad material or teflon or something similar.

 

[F_R]

Re: Evinrude Fleetwin 7.5 bad noises

Whoa, what year motor are we talking about here? I have no idea what "pad" you are describing. I can assure you that I have much experience.

 

[jlt280]

Re: Evinrude Fleetwin 7.5 bad noises

I believe the year is 1954-1956

 

[F_R]

Re: Evinrude Fleetwin 7.5 bad noises

Exploded parts view at http://www.marineengine.com/parts/johnson-evinrude-parts.php There are no pads.

If the armature plate is wobbly, the brass bushing in the center may be cracked loose, or the retainer ring is upside down. It goes flat side up. Or everything is just plain worn out.

The coils must be adjusted flush with the machined edges of the posts upon which they sit, or they will rub the flywheel magnets.

 

[jlt280]

Re: Evinrude Fleetwin 7.5 bad noises

F_R,

Thanks for the help. I checked out the manual (thanks..great link). It appears that the only thing that remotely resembels the "pad" I was talking about could be the "oiler wick", but I can't tell from the diagram exactly where that would sit in the armature. Does the oiler wick ride against the magneto cam? If so, perhaps I was mistaken that there should have been two (180 degrees apart on the opposite side of the crank) and that was what kept the armature centered on the crank.

So looking at the power head diagram I see there is a armature plate support and a armature plate retaining ring. I assume the armature goes between the amature plate support and the armature plate retaining ring? Also, I don't see the brass bushing you speak of in the diagram. Is the brass bushing part of the armature? I would assume I need a new brass bushing so my armature doesn't wobble to and fro.

 

[F_R]

Re: Evinrude Fleetwin 7.5 bad noises

Well, lesse, let me get my terminology correct here: The armature plate support is bolted to the powerhead. The retaining ring is below the support and the armature plate is above. The screws go through the armature plate, into the retainer ring, the support is sandwiched between.

The brass bushing is cast in the armature plate, and not a separate part. It should be tight in the armature plate, but once in awhile one will break loose. Then you have to replace the whole armature plate.

As I suggested, sometimes somebody will install the retainer ring upside down. Then it will wobble, big time.

There is only one cam wick. All it does is lubricate the cam.

You are going to have to remove the four screws (two through the coils and two between the coils and breaker points), then disconnect the throttle arm and lift the armature plate off to see what is wrong in there. You don't have to completely remove the four screws, they will release when they are backed off several turns.

 

[jlt280]

Re: Evinrude Fleetwin 7.5 bad noises

Thanks once again F_R. I will pull that apart tonight after work and see what I can find. I'll be back tomorrow with the results........or more questions.

 

[jlt280]

Re: Evinrude Fleetwin 7.5 bad noises

I removed the armature plate. It all clicked after seeing what was left underneath. It was all together correctly,flat side up on the retainer ring. This is my first outboard, and two stroke for that matter, so I never saw the inside of a magneto assembly before, familiar in theory but that's it.

Anyhow back at the ranch, the armature plate does have some play in it, the brass retainer was not scored or cracked, but there was some slop. If I move
it lateraly, I can move it enough to know there is some room there. If I rock it, it seems to move more than it should. Any idea how much bigger the ID of the bushing should be than the OD of the part it slides over? a couple thousanths at most. I would guess it's maybe .005 now.

I should say that I had the flywheel off to check on an ignition problem. The problem was one of the coil wires was routed such that it was touching the cam bushing when you applied throttle and was shorting. I removed the coil and placed a piece of shrink tube over the wire and rerouted it such that it didn't rub the cam, when I put the coil back on, I don't recall paying close attention to making sure it flush with that machined edge you talked about.

So my theory is it was't alinged and hit the flywheel which probably hammered the bushing. The bushing looks pretty suseptable to being bent since only part of it is backed by the plate material and it is not very thick.

Seen this before?