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.
Identification details about the Lionel Trains 249 Columbia Type Locomotive that Lionel made during the Post-war period.
The original transformer may have been a 1073 which, at 60 watts, should get the loco to run.
Identification details about the Lionel Trains Type 1073 Transformer that Lionel made during the Post-war period.
Use the AC terminals on the 4060 transformer you have.
Larry