WD Hunslet remotoring

Some years ago I built a WD Hunslet using the Langley Models whitemetal kit. I was very happy with how the model came out, but the running was a bit rough and unreliable, so it has never seen much use. It uses a Minitrix N-gauge 2-6-2 chassis, quite an old chassis and although generally robust, the kit required significant modifications including moving the cylinders and motion. I spent some time adjusting the motion and ensuring quartering and gearing were in sync when I built it, yet running was still rough and occasionally the loco stalled without apparent reason.

It was time to do something about it. With the body removed, I removed the motor clips and released the motor from the gearing. This allowed me to check that the chassis rolled freely. The chassis is robustly rather than finely engineered, but rolled easily without any snagging or binding. However, turning the motor over revealed that wasn't so free, with serious cogging, possibly something catching.

Fortunately, Tramfabriek offer a remotoring kit for this chassis. The kit includes a coreless motor, worm, brass flywheel, and 3D printed motor mount. Fitting the upgraded motor is a little fiddly, the most tricky part being soldering the wires. It didn't help the pickup contact on one side of the chassis snapped off, leaving very little to solder to, but the motor contacts are very small too, and I could have done with finer wire (a pity wire wasn't in the kit). My epoxy glue had dried up, but UHU seemed to work. However, the online instructions are excellent, the motor and its mount a perfect fit, placing the worm precisely in mesh with the gear. I had to trim a little of the whitemetal footplate from the inside of the loco body to clear the wires, then the body refitted without issue. 

Even better, it worked straightaway, and the motor upgrade has made a big difference. The loco now runs smoothly and is controllable even down to slow speeds. It is still noisy, due to the coarse brass gearing, and it can be slightly hesitant when setting off from rest. So, perhaps not quite up to the running standard of modern RTR locos, but vastly better than the old motor could manage and easily useable on the layout. I've since been testing it on a rake of coaches; it has plenty of pulling power, and with a controllable crawling speed, coupling and uncoupling is reliable. Finally, this fine loco can be used at exhibitions - expect it to be in service at Narrow Gauge South later this month!