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Author Topic: Sunset SP Mogul
Charlie

Posts: 235
Post Re: Sunset SP Mogul
on: August 27, 2018,
Quote

Tom,
I also find the small metal bristle brushes handy for digging out the small paint flakes stuck in crevices.

Charlie

Charlie

Posts: 235
Post Re: Sunset SP Mogul
on: August 31, 2018,
Quote

The cab is finished till painting time. Windows are moved to the rear and new grab irons installed. Also added roof seam, drip strips, and the turret shut off valve. New awnings were necessary and that took a couple tries.

The new castings to use on the boiler are on order so while awaiting those, maybe check the frame/pilot assembly to see what extra detailing I might want to add.

Charlie

Image

Charlie

Posts: 235
Post Re: Sunset SP Mogul
on: September 2, 2018,
Quote

New working knuckle coupler and air lines added to the pilot assembly. The pilot is a separate sub-assembly attached to the frame with a screw. This made it easy to fit and solder on the two air line pipes. Road engines generally have two pipes and hoses located on the pilot deck (brake line and the signal line).

The valve manifold situated above the left hand cylinder was standard for SP steam locomotives. The pipe on the left goes into the smoke box and soldered there. The pipe on the right goes along under the boiler running board behind the air tank and pump to the cab. I terminated that pipe just as it goes behind the cylinder exhaust pipe in order to be able to remove or re-attach the boiler to the mechanism.

Charlie

Image

Charlie

Posts: 235
Post Re: Sunset SP Mogul
on: September 4, 2018,
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Sunset's builder was apparently somewhat confused by the purpose of the power reverse casting as he had soldered a flat bar to the P.R. to reach the corner of the firebox. The prototype photo shows a typical arrangement for the P.R. and the operation of the Stephenson valve gear through a lever arm.

The second photo shows my version attached to the frame on the Sunset mogul. The top of the lever arm slides just past the end of the actuator arm, but is not attached to allow removal of the upper structure. The screws holding the crosshead guides provided a convenient attachment method without attempting to solder to the heavy milled brass frame.

Charlie

Image
Image

John-
Wubbel

Posts: 89
Post Re: Sunset SP Mogul
on: September 4, 2018,
Quote

Charlie, it is nice you can explain the mechanicals on these engines because the younger modelers at first glance look at these steamers and they are not sure what they are looking at or its purpose toward facilitating a working locomotive. These side by side comparisons enlighten me as well.
John

Charlie

Posts: 235
Post Re: Sunset SP Mogul
on: September 4, 2018,
Quote

John,
I'm happy to answer questions if I can. For any that may be unfamiliar with the what and how of a Stephenson valve gear since it is hidden inside the locomotive frame, the Google has some excellent drawings and videos to show all about it. Basically, the reverse lever pictured is moved forward or backward from top (neutral) to change the timing between the rod moving the cylinder steam valves and the piston driving the main rod to make the locomotive go forwards or backwards.

Charlie

Charlie

Posts: 235
Post Re: Sunset SP Mogul
on: September 14, 2018,
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Not a great deal of progress on this project over the last week. I'm waiting for the new injector castings to arrive so work has been confined to such items as the brake air piping that is out of the way of the injector installation or can be made removable. The Sunset's brake air pipes that were terminated at the underside of the running board were replaced with completed runs of the pipe as shown in the attached photo. Also the distributing valve was moved off the cab floor and soldered to a support on the removable blow-down muffler attachment plate. A simplified version of the piping nightmare between the dist. valve and the engineer's brake control stand seen here is my limit for this day.

Charlie
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