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Re: A few disasters

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  • Glen Chenier
    Well, Michael, the good news is that this is not really a disaster. MTL supplies replacement parts for their F7 locomotive. Sounds like the threads stripped
    Message 1 of 8 , May 24 7:58 AM
      Well, Michael, the good news is that this is not really a disaster.

      MTL supplies replacement parts for their F7 locomotive. Sounds like
      the threads stripped inside this piece? Order a new one from MTL,
      might be a good idea to get a couple extras (they are not expensive)
      for both ends if you plan to clean and relube your loco on a regular
      basis. Also a few chassis screws in case you lose any into the carpet.

      Stripped threads in the front and rear chassis guides happens often.
      To help prevent this start the screw gently with no insertion pressure
      to let it find the pre-tapped thread in the plastic without cutting a
      new thread. But eventually, with enough in-and-out cycles, the thread
      will strip. If you have spare chassis guides on hand already, no
      problem.

      If it is the front chassis guide that is stripped, you might want to
      arder a new headlight as well. As the original headlight wires are cut
      very short, trying to thread them through the holes in a new front
      chassis guide is very difficult. A new headlight or LEDLight has long
      wires that are much easier to fit into those little holes. Just be
      sure to cut them short enough after installed to prevent the wires from
      hanging below the center insulating seperator and shorting together.

      And yes, there is a trick to putting these units back together. Mainly
      the trucks need to be supported by a firmly attached object pressed up
      against the locomotive (I use a 3/4" thick block of wood held in place
      against the ridge of my work platform, but a thick heavy phone book
      should work just as well) and the chassis contact whiskers (thin strips
      of phosphor-bronce that press on the tops of the truck towers for
      electrical conduction to the chassis and motor) must be set up to the
      correct position first. Then after assembly hold the chassis halves
      together and swivel the trucks around; they must stay at their last set
      positions. If they attempt to spring back to their preferred position
      this means a contact whisker has caught wrong in the truck tower and
      assembly must be repeated. If the trucks stay put where you set them
      then the screws can be installed. As a final test be sure each truck
      when powered separately will run the motor.

      In the Files > Dcc section of this list there is description of MTL F7
      overhaul that includes more detail on re-assembly.
      See the file DCC_and_Overhaul_MTL_F7.doc



      --- In z_scale@yahoogroups.com, Michael Mihalka <mihalkam_1999@...>
      wrote:

      > After lubricating my MT F7 [for the first time], the plastic chassis
      piece that held one of the screws broke off. How can I fix this? BTW is
      there some trick to putting these units back together? Mine wouldnt run
      after the first reassembly leading to disassembly and the subsequent
      broke chassis piece.
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