I was having trouble with my Sd 80 mac making a grinding noise from the front truck.Found the front motor was grinding on the gears.Pulled the shell off and found a loose motor.I can see the motor screws are loose.My question would be how to achieve access to the screw heads.Any help would be appreciated Thanks.    

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When this era TMCC diesel was manufactured, Lionel designed what I refer to as the "PITA" truck assembly.

The motor actually screws into a mounting plate from the bottom; unfortunately, you have to remove that mount plate from above. I haven't done mine recently, but the screws that hold both pickup rollers will need to come out along with any other forgotten screws I'm over-looking from memory....

You'll see the mounting plate in question once you remove the shell and get some visual access.

Unfortunately the pick up roller screws look like they come down  from the top.Looks like the motor mounting plate will not pass through the chassis.I cannot locate any screws for the motor mt. plate.Thanks for your help so fare.

If you visit the Lionel site here , you'll find all of the documents that you need. Pictorial diagram is the one. Look at the blue links at the bottom of the description. Save them to your computer and archive them.

The screw locations are a bugger. Getting the shell off will be a little tricky. Be careful of the lighting connectors and such.

You need to remove screws 30&38 and it will come apart,make sure you don't lose the thrust bearing 14,also the axle bearings have a flat on them and have to be lined up properly. I have 6 of the NYC SD-80's and every one of them had loose motor screws.



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