Help with throttle valve

This forum is dedicated to the Live Steam Hobbyist Community.

Moderators: Harold_V, WJH, cbrew

Post Reply
gfdmatt
Posts: 5
Joined: Wed Nov 03, 2010 5:28 pm

Help with throttle valve

Post by gfdmatt » Mon Aug 13, 2018 3:46 pm

Hey guys,

I am posting this for a friend of mine. He bought a nice little engine that he is attempting to get going again. The only identified issue is the throttle valve which was diagnosed with a significant leak.

I have attached photos of what came out of the locomotive. Would it be best to rebuild what he has, or is there another option to replace that throttle with something similar or better?

Thanks,
Matt
Attachments
13CA3A94-A01D-4163-A2F0-C0CD44FE7371.jpeg
F11C761D-7CB6-4367-88C3-442C2525CC66.jpeg

Soot n' Cinders
Posts: 851
Joined: Wed Jun 27, 2012 5:24 pm
Location: Marietta, Georgia

Re: Help with throttle valve

Post by Soot n' Cinders » Mon Aug 13, 2018 5:42 pm

I don’t see any reason that throttle can’t be reused. Just get some lapping compound and take some time to lap the slide and body to each other.
Another question is how bad is the leak? Every valve is going to leak some amount. A friend of mine who spent his career working on the D&RGW narrow gauge K series says he’s never found a locomotive that doesn’t have leaks
-Tristan

Projects
-2.5" scale Class A 20 Ton Shay

User avatar
Marty_Knox
Posts: 1554
Joined: Thu Jan 09, 2003 6:50 pm
Location: Michigan, USA

Re: Help with throttle valve

Post by Marty_Knox » Mon Aug 13, 2018 6:03 pm

I would rebuild what you have. The Allen throttles work well if you put a little work in them. You will need access to a lapping plate and some Timesaver non-embedding lapping compound. The disc and seat both need to be flat. Once they are flat, you need to lap the disc to the seat. You need to put a stainless steel spring in the arm behind the disc. It also helps to put a spring on the post to hold the arm against the throttle body.

Vance Nickerson
Posts: 97
Joined: Fri Feb 16, 2007 9:01 pm
Location: Gladewater, Texas

Re: Help with throttle valve

Post by Vance Nickerson » Thu Aug 23, 2018 6:38 am

I have a few spare throttle castings for Allen boilers but like Marty said fix yours. The more time you spend on it the better it will work.

Vance Nickerson

gfdmatt
Posts: 5
Joined: Wed Nov 03, 2010 5:28 pm

Re: Help with throttle valve

Post by gfdmatt » Fri Aug 24, 2018 1:52 am

Awesome, thank you guys for the feedback. It's much appreciated.

Post Reply