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O Scale Atlas, Bachman, Hornby, K-Line, Lionel and classic toy train discussion.


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Old 01-13-2020, 10:23 PM   #11
Millstonemike
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The "box" behind the light is the reverse unit. TO check if the E-unit solenoid is getting power. Put it on the track (or attach alligator clips) and cycle transformer power from off to on - minimum voltage. You should be able to hear the solenoid engage on each application of power. Note: the E-unit only cycles with the motor right side up.

If it's not moving it could need some service. But first check the E-unit's power switch. A little lever on the side of the unit. When engaged, the E-unit's coil gets power from the center rail and cycles with track power.

The level can be moved to break that connection. Thus the solenoid never gets power and the motor remains in it's last direction.
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Old 01-14-2020, 12:46 PM   #12
ennisdavis
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I was told in this thread these units did not reverse. No switch
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Old 01-14-2020, 05:48 PM   #13
Millstonemike
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My 1666 does not have reverse but has a smoke unit. You may have a motor from a different loco. Marx steam motors were pretty much interchangeable between shells. Lots of re-use of the basic design. That is what made Marx the low cost producer.
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Old 01-15-2020, 08:08 PM   #14
ennisdavis
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e unit

I looked at the e unit and it looks like it is wedged between the motor plates. A tough job to repair.
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Old 01-16-2020, 05:53 PM   #15
Millstonemike
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That motor has been rewired? Are you sure the E-unit is getting power? Cycling full throttle should give you an indication that the solenoid is trying to move. If it is cycling correctly, perhaps the E-units connections to the motor were not properly rewired.

If it's stuck, sluggish, spray an electrical cleaner (CRC, Goo-gone, etc.) into the unit where ever you can fit the cans "straw-like" extensions. Then cycle power with the engine upright. It may several applications.

Panther recommends WD-40. But others council against any lubricants as they tend to pick-up and accumulate dust. Yet Panther has repaired some 100 Marx E-units.
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