Restoring a modified Allen 2-4-0 barn find

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flyguy
Posts: 23
Joined: Sat Dec 20, 2014 4:28 pm
Location: Santa Clarita, CA

Re: Restoring a modified Allen 2-4-0 barn find

Post by flyguy » Sun Jun 10, 2018 4:06 pm

I was looking for the live steam article “A Tale if Five Moguls” specifically for a steam dome ball valve throttle solution. I reached out to LSORR about getting a back issue but never heard back from them. If anyone has a copy of the article I would appreciate it. I would like to equip Brandon’s engine with this modification.

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John_S
Posts: 692
Joined: Wed Apr 06, 2011 8:21 pm
Location: Cumming, GA

Re: Restoring a modified Allen 2-4-0 barn find

Post by John_S » Fri Jun 15, 2018 9:36 pm

tyleire wrote:
Sun Jun 10, 2018 12:35 am

Pieces of .010 stainless shim did the trick. Then it was on to the valve gear. I had a massive amount of valve rod slop when running the locomotive last year, so I knew I'd need to replace a lot of stuff.
I started by ordering the Allen EDM cut expansion links and die blocks. New link pins for the die blocks were made on the crap-tastic Harbor Freight mini lathe with a few attempts made to get the tolerances right.
IMG952562.jpg

We were less than amused to discover the original expansion link saddle didn't match the plans and therefore the new EDM expansion link, so we made our own.

IMG952587.jpg
IMG952592.jpg

Next we made new eccentric rod clevises with a built in offset designed for the rods to feature left and right hand threads for easy adjustments.

IMG952544.jpgThe hex was drilled out through the center and soldered on the rod to allow a wrench to adjust. 20180304_182658.jpg

Then lifting links were measured and holes drilled. Next eccentric straps were removed, lapped with Timesaver Lapping Compound to prevent any material embedded in the bronze, test fitted, repeat the whole process, and finally reinstalled with a tight, slop free fit.

Starting to take shape!

20180304_182719.jpg
Did you harden any of these parts? On my Mogul I remachined a lot of the valve gear and hardened all of it. The clevises and pins really need to be hardened as well as they will wear pretty quickly. Wish I had known all that when I first made them.

flyguy
Posts: 23
Joined: Sat Dec 20, 2014 4:28 pm
Location: Santa Clarita, CA

Re: Restoring a modified Allen 2-4-0 barn find

Post by flyguy » Mon Jun 18, 2018 4:39 pm

Hi John,

I helped Brandon with the rebuild. I am finishing up an Allen 4-6-0 as well. We made the clevises from 4130 hardened them to 35RC. I did not make hardened clevis pins, as I figured I could easily replace these. The link saddle pin and lifting arm pins were made from hardened and ground A2, the die block pin was machined from 32RC A2. Are there any other areas you felt needed attention? Im all about keeping an engine out of overhaul!

Thank you for the correspondence,

James

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