Williams Crown Edition

Is this a Flywheel motor? It should fit. Those RS-385 are universal.

It is a flywheel motor and as you mentioned says RS385 along with other numbers

on the second line below it.

There not really universal,  RS385 is the size of the can, poles and magnetic strength.  There are also usually 4 to 5 other numbers that go with the can that determine voltage and speed characteristics.  Can you get away with it with conventional engines, sure.

But the items that the motor numbers do not answer are type of worm gear on shaft and flywheel.

So, the best thing to do is call and ask.

MTH as an example has very different Flywheels and gears even diesel to diesel.  G

The primary issue with motor swapping is the motor worm. If they are different you can remove and swap them but its not easy as they are an interference fit. You would have to make a special jig to avoid bending the motor shaft to install the gear.

The flywheel is less of an issue unless clearance is close. Early Williams used smaller diameter but thicker flywheels. Later ones had thinner but larger diameter flywheels.

Pete

I've seen a total of three attempts to change the worm and flywheel.  So far the batting average is .000, clearly you need the correct tools to do this job.

John, One way to increase those odds is to cheat. Enlarge the hole in the gear to make it a sliding fit then use epoxy or CA to hold the gear in place. Epoxy is safer as there less chance to get it in the bearing.

The best tool would be a broach to keep the clearance to a minimum but you would likely have to have a special one made.

I am batting .500, 1 for 2 but did not cheat on the successful swap.

Pete

All three of the ones I refer to were apparently roached in the removal process.  Apparently, when the gears and flywheel are installed, they shrink fit them with heat.  It's hard to heat the gear for removal without also heating the shaft, so you don't get the same effect.

Thanks for all the replies.

I emailed the original owner and told him the problem with the motor and

he offered a full refund including shipping.

They are on their way .

This is not completely true.  Heat works, and mechanics use it all the time.  The key is the right amount as the worm expands first.  You can also lightly tap.  What this does is break any friction/corrosion or adhesive bond between shaft and worm.  Same with flywheel.

I have disassembled quite a few bad motors to collect gears and flywheels successfully.  Only had one stubborn flywheel.  I even had one motor with a kink in the can I repaired.  You could easily rewind the armatures and reassemble if you wanted too, the problem is it would be time consuming and probably cheaper in the long run to just get a new motor.

I have found that a proper sized punch is the easiest way to get gears and flywheels off for me.  Others have good success with the expensive gear puller.   G