Tank car truck uncoupler issue- Ideas needed to solve

Is there play in the upwards movement or will in it hold in a higher position when the coupler is closed?

Open the coupler, hold it up and close the coupler.

It certainly looks like it is worn or broken and in too low of a position.

Look around on the bottom for screws to release the tank cradle. That would allow access to the truck screw from the top.

here is a parts break-out from MTH.

is this problem isolated to just this one truck ? or is it both? Looks like the coupler arm on the truck pictured is keeping a nice droop....perhaps the truck frame or the arm is bent?

Carl, thanks for the exploded view and I did what you suggested.   I also added dental rubber bands to see if that helped and it did,  However still a problem. Harmonyards, I looked for bent items but nothing is really obvious, although there is a bit of extra "droop in one of the coupler arms when the rubber bands are not on.  The rubber bands snugged them both up to the coupling arm.  I happen to have the same tank car in a Southern livery and the thumbtack on it is about 1/32 shorter than the PRR.  apparently that is the difference- appears to be a manufacturing tolerance issue.  

Have either of you taken this apart?  I might price out some new trucks just for grins but I hate to destroy a tank car with disassembly.  Seems the screw to hold the truck is on the inside or am I missing something on the exploded view?

Thanks for the help.

Here is the southern car and the penn car, two things obvious:

1) The length of the thumbtack.  But more impact on this next item

2) As noted earlier, it does appear something is bent since the coupler arm is much lower to start with on the  PRR tank car.  (You can see the rubber band.)

Looks like time to try to disassemble!

I should have looked closer at the exploded view, the trucks came off very easily. Between tightening the screw that holds the coupler and twisting to the extent possible while loosening and retightening the other screws, I am pleased to announce that both thumbtacks clear the track actuator button on my test track.

thanks for the ideas and motivation.  Interesting how a few fractions of an inch in the wrong direction can cause a major problem on something as simple as a truck.

I am glad it wasn't FUBAR. The Premier line of rolling stock is nice and usually repairable. Good to hear that it only needed some maintenance.

keep on truckin'!