Crank bearing inside the Mag plate M engine

[old servi]

Phelon on the M and Wico on the H.
The H has a set screw to keep the bearing from turning or moving in or out.
This is the first M that I have worked on and it seems a lot diff.
Anything go between the bearing and the belt pulley?
Thanks

[Mike Sal]

The phelon magneto came on in very late '55 or the beginning of '56 (my guess is very late '55, as I've read that there were usually unsold bikes left over at the end of each year in the 50's and they just sold them as the next year's model).  

I'd bet that expert that rebuilt that motor didn't have a clue regarding the oddities of a Simplex motor.
Mike Sal

[pd]

"This is the first M that I have worked on and it seems a lot diff."


They are different . You should study the manual to see them side by side . They obviously have similarities , just the location of parts is about 90° different , among other differences .


"Anything go between the bearing and the belt pulley?"

The manual shows a washer ( #1260 ) and states to use it only if originally used .
And , again , the Phelon mag does not use a spring between the cam and bearing .

Here are links to the manuals for your M , if you don't already have them :

http://www.simplexservi-cycle.com/index.php?topic=430.0

http://www.simplexservi-cycle.com/index.php?topic=100.0

[pd]

Thanks for that , Mike .

[Ricks]

Pete, good job on asking which magneto.  I had Wico in my mind for some reason.  I have a 1958 Automatic manual, and it doesn't have that notation next to the spring as Wico only.  They must have updated that in the 1960 manual.

Is there space between the bearing and cam on the Phelon or do they butt up next to each other?

[Mike Sal]

I think there is a gap on mine, but don't remember for sure.  If I have to pull the flywheel off sometime I'll check it.
Mike Sal

[pd]

Rick ,

I thought you must have been thinking Wico . That's why the question for clarification and reiteration .

There is no space between cam and bearing on my Phelon mag . The cam is tight against the inner bearing race and is held there once the flywheel is mounted .

Pete .

[old servi]

Since there was no bearing in the engine on the mag plate, I will not know if a spacer
is used between the bearing and the belt pulley.
Any input on this.
Thanks

[Mike Sal]

What is your motor number?  My phelon set up doesn't use a spacer & it's #M23561B.
Mike Sal

[Ricks]

I have never seen a spacer in any motor I have disassembled!

[pd]

It's likely that you'll have to heat the plate in order to install a new bearing , much like installing a motor case bearing . I believe the bearing should be flush to the back side of the plate .

The drive pulley is flat on the sides . There is some space between the pulley side and the back side of the plate . That space is determined by the plate mount and the spacer ( #4330 ) for the forward case to plate bolt ( #3157 ).

 I don't see a need for the washer / spacer ( #1260 ) other than to maybe insure that the plate bearing outer race could never come in contact with the drive pulley , but   Exactly why some had them , I really don't know for sure . The plate bearing has little to no side pressure . It seems to me that it's main purpose is supporting the flywheel and adding counter or resistive support for the drive belt .

[old servi]

Mike the number on my engine is M23065B.
Thanks PD, Mike, Rick for all the info. Hope to get this
engine running soon.
Is there any other number for the mag bearing other than the
5203 zz number.

[pd]

"Is there any other number for the mag bearing other than the
5203 zz number."

That # is all any bearing jobber will need to set you up .

I'd measure the depth of the plate where that bearing will live to make sure you're ordering the correct width .

I'd be interested to know that measurement .

Pete .

[Mike Sal]

My magneto plate was a snug slip fit onto the bearing.  I had the bearing on the crank & slid the plate on slowly as I pulled the wires thru the hole (you want to be careful to not scuff the insulation of the wires).  No heating required for me.
Mike Sal

[Ricks]

I'm with Mike on this one.  The several that I have done have just slide on with a little twisting motion.