MTH PS-1 motor swap

Probably you are in the best position to answer that yourself. The key questions you need to answer are: 1) Will it fit the mount? and 2) Is the worm gear the same pitch? If the worm is the same diameter and has the same number of spirals per inch, and the motor will fit, it's worth a try. 

There is most likely a reason for the different part number.  You need to check very carefully, it's likely there is a difference, probably in the length, diameter, or pitch of the worm gear.

MTH has the BE-0000040 motor in stock. $25.00. plus shipping.

I figured they had it, but I was trying to save on the $30 to get it since I have a perfectly good motor.  I'll have to find my thread gauges and calipers to check both motors.

Like John said, each motor # tells MTH which engine it's for, the size of the worm gear and size of the flywheel. They all go together with the gear ratio in the engine. So with the different #'s the worm gears aren't same.

Ralph 

Frank Timko can replace the motor with a good one, but the price might be similar.

I would think that the size and pitch of the gear on the motor shaft is the real difference. It might seem like it fits, but end up tearing up the gears.

Can't you just remove the flywheel and use the old one?  Alternatively, if the worms are not identical, pull the worm off the bad motor and put it on the good one.  I have found that some heat, a fixture to hold the worm, and a good drift pin will remove these gears.  Catch the motor before it hits something hard.

On the other hand $30 sounds really cheap for an MTH motor.  Before we figured out how to change worms, MTH sent us a couple of motors, and the invoice said $79 each.  That was easily 15 years ago.

There are sometimes very subtle differences in the worm gear for different parts.  I'd use the right motor.

As far as pulling the gear off, I'll bet you destroy the motor trying that.  I've seen two attempts, both ended up with new motors.

I agree with John. Getting the flywheel off isn't too bad. Getting the worm gear off is another story. They are on very tight, I've tried. It's best to just get the right motor.

Ralph

30 bucks is cheap for a Pittman motor but typical for the small Mabuchi. You can find them w/o gears or flywheels for 5 bucks on the bay.

Getting flywheels and gears off a motor is not that hard with a proper puller but reinstalling those parts is where you can get into trouble.

pete

You heat the gear and cool the motor in your freezer.  Have a setup to keep the gear in place until they both reach ambient.

It wouldn't be cost effective for a individual to make a puller unless they have a machine shop at their disposal. Then you would also need a press to install. With the proper tool's you can remove and install almost all gears and flywheels without destroying the motors. 

Bill

That's a nice puller. Better than I have found. Do you sell those?

Ralph

I am sure he had it made.  I made one, but the metal was too soft, not a large enough rectangle so it did not worth as well.  I have removed and replaced fly wheels with out issue.  Every once in a while you get one that doesn't want to come off.

as far as motor on ebay, I have not seen them with double shaft.  Just single, so no where to mount fly wheel.   G

Ralph,

    I had that made by a local machine shop.

G,

   How many would you like,

I'll say again, without the correct tools and experience, you'll more likely kill the motor than actually accomplish getting the correct worm gear on.  I don't run into enough demand to remove gears to invest in the tooling to do it properly.

Don't be penny-wise and dollar-foolish; buy the right motor. $30 won't fill your

gas tank.

Bill, I will send you an e-mail.  G

Check the Northwest Short Line website for a variety of pullers.

El-cheapo motors can be had most anywhere online: 

I guess you can use up a few motors trying to pull the gear and still be ahead?

Again, Not a double shaft unit.  G

Actually, $30 does fill my tank, for a week.  When I get a chance, I'll compare the 2 and then decide what I'll do.