Mamod mk1 o ring

A very popular starting point for Live Steam. With their low cost comes a number of problems which can be discussed here
Post Reply
User avatar
Sir Clothem Cap
Driver
Driver
Posts: 1707
Joined: Sun Sep 26, 2010 8:45 pm
Location: Hampshire
Contact:

Mamod mk1 o ring

Post by Sir Clothem Cap » Tue Apr 09, 2013 9:21 pm

Does anyone know where I can get a replacement for the tiny o ring that seals the plastic pipe on to the gas tank?

User avatar
mikewakefielduk@btinterne
Fireman
Fireman
Posts: 309
Joined: Wed Nov 28, 2012 1:43 pm
Location: Shropshire

Post by mikewakefielduk@btinterne » Tue Apr 09, 2013 10:53 pm

Phone Mamod and they'll send you a couple. They don't usually charge.

Mike

User avatar
Sir Clothem Cap
Driver
Driver
Posts: 1707
Joined: Sun Sep 26, 2010 8:45 pm
Location: Hampshire
Contact:

Post by Sir Clothem Cap » Wed Apr 10, 2013 10:58 pm

Thanks Mike thats brill

User avatar
Chris Cairns
Driver
Driver
Posts: 2364
Joined: Mon Oct 29, 2007 7:25 pm
Location: Glasgow, Scotland

Post by Chris Cairns » Thu Apr 11, 2013 4:01 am

If you have not already done it Bryan I would clean up the machining burr on the face of the gas tank fitting with a file - this led to the failure of an 'O' ring on one of my Mamod burners.

Image

Chris Cairns.

User avatar
Sir Clothem Cap
Driver
Driver
Posts: 1707
Joined: Sun Sep 26, 2010 8:45 pm
Location: Hampshire
Contact:

Post by Sir Clothem Cap » Fri Apr 12, 2013 7:31 pm

Mine failed as I lent it to my nephew who could only refill the gas by removing the tank each time.

Sniper
Cleaner
Cleaner
Posts: 9
Joined: Fri Aug 31, 2012 5:15 pm
Location: Ipswich

Post by Sniper » Mon May 13, 2013 7:23 pm

I cleaned up the face on the fitting on mine but still couldn't get a seal, in fact almost any gas pressure popped the pipe off. It just didn't grip at all, the pipe seemed to collapse and fall off.

I ended up using a tiny piece of tube to reinforce the inside of the plastic pipe (a short length of the needle valve you get with a foot pump for blowing up footballs!) this has helped with getting the O ring to grip the pipe without it collapsing.

I think long term I'll invest in some proper copper pipe for a more permanent fix.
Olympic standard tea drinker.

User avatar
Chris Cairns
Driver
Driver
Posts: 2364
Joined: Mon Oct 29, 2007 7:25 pm
Location: Glasgow, Scotland

Post by Chris Cairns » Mon May 13, 2013 7:48 pm

I had a similar problem with the nylon gas pipe on my Mark I (actually one of the early Mamod Train's) and it would only seal with 3 'O' rings fitted.

Now replaced by a piece of copper tubing with an olive soldered onto the gas jet end, and a slightly thicker 'O' ring used on the tank end (slowly replacing all my Mamod nylon gas pipes with this copper tubing).

Chris Cairns.

Post Reply

Who is online

Users browsing this forum: No registered users and 3 guests