Jump to content

N20 motor / g,box


Recommended Posts

Following Ruston's advice on his workshop thread re these N20's I purchased a "D" version, 381 Shaft RPM to experiment with. 30 minutes with some basic tools saw the job done for converting to 1/8 axles and testing. Removed just enough of the rivets from one side using a 2mm drill in the pin vice and removing the screw from the adapter block leaves you able to remove one side and the final drive and 3mm shaft. I pressed the drive off the splined shaft with long, thin socket in the vice. Now with a 1/8 broach I removed the splines from within the final drive gear and opened out the two spacers and the frame bearings. Reassembly is a simple reversal. Photo of box with one side and final drive removed, the three video links show running on DC via trusty H+M Duette, then a Lokpilot V4 then a Zimo 648R. Running at around 1/4 speed on DCC.  Works well enough on all 3 so far, although I don't have a target loco for this yet I though it worth a play although this version may be best used with small diameter drivers. It is actually quieter in the flesh than the camera picks up. Now ordered a "C" version to convert and test. I haven't checked yet but I'm guessing that the motor mount screw centres within the adapter block might match other motors, will test with next one, just needing the worm swapping, shaft diameter willing! Might help anyone considering these.












Edited by Carnforth
  • Like 8
  • Informative/Useful 1
  • Craftsmanship/clever 1
Link to post
Share on other sites

  • 2 weeks later...
On 24/06/2021 at 16:17, Enterprisingwestern said:


Carnforth, do you wish to keep this thread for your own adventures in D style N20's, or allow input of others?

I ask because I've purchased a couple for experimental purposes and was going to comment on progress somewhere.



Not at all, do whatever you please. If it helps others all the better. I now have a type "C" which I have modified and the 3rd shaft has an extra reduction, giving the lower shaft speed, or put another way, the motor is spinning nearly three times as fast for the same final reduction. Also the motor mounting holes in the adapter plate are about 9.5mm apart and the motor shaft is 1mm. HTH


  • Thanks 1
Link to post
Share on other sites

  • 2 months later...

As an update. tested two of these, type C and D.  Att video links of Type C in an unfinished Peckett kit for a customer. Next one goes in a Pannier chassis kit. Ignore the noise, it's the sensitive microphones on the camera. Test is running on pure DC as with H+M Duette. Type D ( not shown ) was not best for slow running, as expected.



Edited by Carnforth
  • Like 1
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Create New...