Jensen J-42R engine build (finished )

• Jensen J-42R engine build (finished )
  Posted by St Paul Steam on 01 Jul, 2019 21:11
• I haven't documented a new engine build in years, but with this new forum I felt I could do it here for any that want to follow along with the progress. many of you have seen the Jensen J-42 build I finished awhile back...this new engine shall be the companion engine that I had always had in mind when I built the J-42, this plant (J-42R) will have many similarities in that it will also have (2) #35 engine boilers on the single firebox, but will be different in that the cylinders will be facing outward & the axles facing inward joined by 1 flywheel, I'm going to try to mount the axles with ball bearings on this one, I see this as a challenge as the axles will need to be almost perfectly aligned & that's going to require some shimming & plenty of adjusting I imagine. this engine should be a self starter with the ability to tie the engines together & set the timing anywhere I want .
  I have started on the firebox.
  
  setup on sheet metal.
  
  
  
  
  
  
  let the forming begin
  
  
  
  
  main structure finished
  
  
  
  
  The #35 donor engines
  
  
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• #1 Reply
  Posted by IndianaRog on 01 Jul, 2019 21:34
• Love it...enjoyed seeing the firebox forming progression.  For some reason I thought you might have had a metal break for forming the firebox base flanges...you used good old piece of steel and clamps to accomplish that...something any of us "should" be able to do.
  
  Will follow til the steamup!!
  
  Rog
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• #2 Reply
  Posted by Stoker on 01 Jul, 2019 21:44
• Oh Goodie ... this is going to be great .... Pass the popcorn please!!!   ;c)
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• #3 Reply
  Posted by St Paul Steam on 01 Jul, 2019 22:14
• Quote from: IndianaRog on 01 Jul, 2019 21:34

  Love it...enjoyed seeing the firebox forming progression.  For some reason I thought you might have had a metal break for forming the firebox base flanges...you used good old piece of steel and clamps to accomplish that...something any of us "should" be able to do.
  
  Will follow til the steamup!!
  
  Rog
  

  I do have a small metal brake, & ironically I have been looking at a dedicated metal brakes today, I think a 12" would be big enough, they all seem to be one form or another of the same Chinese Mfg. I have decided that my Jensen collecting would focus primarily on older brass tag, black firebox Jensen's & I need better tooling for the firebox's if that's what I'm to build more of in the future.
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• #4 Reply
  Posted by SeeSteam on 01 Jul, 2019 22:37
• Get the box perfectly square isn't easy to do even with a simple box break.
  
  Also how did you cut the nice curves for the cradles?
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• #5 Reply
  Posted by Nick on 01 Jul, 2019 22:54
• Thanks Again for taking the time to document this one Bruce 
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• #6 Reply
  Posted by Jim on 01 Jul, 2019 22:58
• I don't like build threads, I love them
  
  Thanks Bruce for this thread
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• #7 Reply
  Posted by St Paul Steam on 02 Jul, 2019 06:08
• Quote from: CBWho on 01 Jul, 2019 22:37

  
  
  Also how did you cut the nice curves for the cradles?
  

  I cut them out with my scroll saw & a metal cutting blade.
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• #8 Reply
  Posted by Roscoe on 02 Jul, 2019 08:26
• You did a real nice job with that improvised brake you have there. Neat video. Great looking fire box, nice corners.
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• #9 Reply
  Posted by St Paul Steam on 05 Jul, 2019 06:25
• got a little farther with the build, firebox finished with several layers of paint
  
  
  
  
  
  
  
  axles setting in place, will have to considerably shorten them. the boilers cleaned up well enough that I don't think I'll have to send them off to be re-plated.
  
  
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• #10 Reply
  Posted by Nick on 05 Jul, 2019 09:36
• Looking good Bruce 
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• #11 Reply
  Posted by classixs on 05 Jul, 2019 10:04
• Great thread Bruce, thanks for bringing us along here...
  
  
  Some good progress allready, will be looking forward to follow the completion 
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• #12 Reply
  Posted by St Paul Steam on 07 Jul, 2019 21:12
• I was able to make a bit more progress this weekend.
  
  here is the cross-over manifold , it consist of 12 pieces including the pressure gauge
  
  
  
  all soldered up & ready to install
  
  
  
  test fit of some of the components, the sight gauges currently don't match, but that will be rectified soon.
  
  
  
  
  
  
  
  
  
  very 1st running on compressed air.
  
  https://youtu.be/_E6Lv2gAB4Y
  
  the heater pan still needs to be fabricated & heaters & cord installed, then work on the plinth to do.
  
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• #13 Reply
  Posted by Nick on 07 Jul, 2019 21:46
• AWESOME Bruce!! 
  
  I wish these were readily available!!
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• #14 Reply
  Posted by classixs on 08 Jul, 2019 00:58
• That sure is a great looking engine Bruce, very well done so far
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