Pictures

The 239 is a 'Scout' engine and was made with a unique Bakelite-bodied motor with a unique reversing system. They were low-end entry-level locomotives that were known to run erratically. They were not really made to be serviced, although they could be.
https://www.tandem-associates.com/lionel/lionel_trains_239_loco.htm

The original transformer may have been a 1073 which, at 60 watts, should get the loco to run.
https://www.tandem-associates.com/lionel/lionel_trains_1073_transformer.htm

Use the AC terminals on the 4060 transformer you have.


Larry

Because of the loco's motor design, all the wheels and the track have to be very clean. Use Naphtha on a rag to clean everything as best you can and use a ScotchBrite pad to shine the wheels and track. Go over everything again with the Naphtha to clean off any residue.

Bypass the track. Hold the loco in one hand right side up and connect one wire from the transformer to a roller pickup. Turn on the power and touch the other transformer wire to one of the drive wheels. The loco should run. If not, move the reverse lever on top and try again. If the loco does not run, chances are the motor is in need of servicing. Not a fun project.

The attached service manual gives you a parts view of these unique motors. The wheels on one side need to be pulled off, and there are two metal clips on either end that hold the motor case halves together. Inside the motor is a handful of never seen before parts that need to go together precisely in the right order without flying out. You need tons of patience and 4 hands to reassemble the motor and get it to work.

I have repaired a number of these locos, and I cringe just remembering the multiple times it took to take apart and reassemble the motor until it ran.

If you still feel up to it, go at it. You have been warned.


Larry