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Recently I purchased the second of this type engine and tender. With the first one I thought it was a fluke but now this new acquisition does the exact same thing. It doesn’t make any difference where it is on the layout; nor the speed. As a test, each was pulling a single light weight car. The knuckle opens, I back the engine to lash up again and off it goes for another short distance. And recommendations will be appreciated. Thank you,

Jay

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Just so you are aware, the parts diagram for that tender is not listed at the moment. https://www.lionelsupport.com/...g-4-6-2-Pacific-8004

That said, knowing that other engines in that time era likely used similar parts - so an an example this 6-18003 https://www.lionelsupport.com/...nder-Only-6918003T01

So that particular series of 6 wheel truck

And then here is a topic on that series of truck and the coupler https://ogrforum.com/...x-wheel-tender-truck

These images from that topic- notice the plastic "thumbtack" style coupler armature- the part that moves and unlocks the knuckle for uncoupling.

I'm not sure if this is the exact one for that series of coupler?

https://www.lionelsupport.com/...LASTIC-W-THUMBTACK_2

That said, under load, it's not surprising for those plastic ones to uncouple since the pin can bend and thus unlock the knuckle. That's why either using a ziptie or o-ring, or rubber band, basically some method of further holding and locking that critical locking pin into the knuckle will better hold the load and not randomly uncouple.

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