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SP AC-7 by Key.

Disassembly for painting.

Removing the running gear from the boiler was a little 'tricky' due to all the 'super' detail added to this engine.  I had to bend or move 'piping' on both sides of the boiler to remove the drive gear set under the cab and the same with removing the boiler front from the boiler.

SP AC-7 4-8-8-2 cab forward key 20SP AC-7 4-8-8-2 cab forward key 21SP AC-7 4-8-8-2 cab forward key 22

They had a wire connector to easily remove the back drivers from the front drivers.  A lot of piping on the back drivers.

SP AC-7 4-8-8-2 cab forward key 23SP AC-7 4-8-8-2 cab forward key 24

I added another sound cam since the ones I use have plastic between the contacts and, thus, easier to set up the chuffing.  The original cam is smaller in diameter so I had to make a new hole in the driver retaining plate plus move the cam to another driver where a brass rod between the two frames did not interfere  with the cam.   I find drilling multiple holes is the easiest way for me to make a square hole.

 SP AC-7 4-8-8-2 cab forward key 25

An 'X' is placed on the end of the driver that receives the new cam: saves time not having to re-quarter the driver.

SP AC-7 4-8-8-2 cab forward key 26 

A press is used to remove/install one wheel/cam.

 SP AC-7 4-8-8-2 cab forward key 27

After the cam/wheel added, side rods re-added and pushed over the track to insure no binding.

 

SP AC-7 4-8-8-2 cab forward key 28

While using a tooth brush to clean all parts before painting, I, luckily, saw that I pulled two of the springs off the functional truck frames and, fortunately, they didn't go flying off into the unknown and re-inserted them.

SP AC-7 4-8-8-2 cab forward key 29

 

I figured it would be easier to first paint (and mask off for the black) the cab interior on these cab forwards so the cab was painted with burlington green.   Also, did the UP big boy and 4-12-2 cabs.

SP AC-7 4-8-8-2 cab forward key 30SP AC-7 4-8-8-2 cab forward key 31

Tomar caboose lights added to the back of the tender: again, top/bottom snipped off to make 'modern' looking marker lights.

SP AC-7 4-8-8-2 cab forward key 32

Attachments

Images (13)
  • SP AC-7 4-8-8-2 cab forward key 25
  • SP AC-7 4-8-8-2 cab forward key 26
  • SP AC-7 4-8-8-2 cab forward key 27
  • SP AC-7 4-8-8-2 cab forward key 28
  • SP AC-7 4-8-8-2 cab forward key 29
  • SP AC-7 4-8-8-2 cab forward key 30
  • SP AC-7 4-8-8-2 cab forward key 31
  • SP AC-7 4-8-8-2 cab forward key 32
  • SP AC-7 4-8-8-2 cab forward key 20
  • SP AC-7 4-8-8-2 cab forward key 21
  • SP AC-7 4-8-8-2 cab forward key 22
  • SP AC-7 4-8-8-2 cab forward key 23
  • SP AC-7 4-8-8-2 cab forward key 24
Last edited by samparfitt
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