Mamod Brunel - Mark 3

A very popular starting point for Live Steam. With their low cost comes a number of problems which can be discussed here
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rebelego
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Mamod Brunel - Mark 3

Post by rebelego » Tue Apr 30, 2024 4:05 pm

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I have got one of these chunky beasts.
Guess it takes some time to get used to it.
And some modifications are needed.
Looks like the exhaust outlet has threads.
What kind of threads?

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Re: Mamod Brunel - Mark 3

Post by rebelego » Wed May 01, 2024 3:07 pm

rebelego wrote: Tue Apr 30, 2024 4:05 pm Looks like the exhaust outlet has threads. What kind of threads?
Could it be BSW 5/32" x 32?

(I'm more familiar with metric threads.)

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Re: Mamod Brunel - Mark 3

Post by rebelego » Fri May 03, 2024 6:52 am

If the Mamod copper pipes are 1/8", I guess it makes more sense if the outlet is BSW 1/8" x 40?
I can easily push an M3 in without resistance, so a 1/8-40 might be a rather loose fit.

To do test runs indoor I made a condenser. The copper pipe used is 3 mm, just screwed in.
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Re: Mamod Brunel - Mark 3

Post by rebelego » Mon May 06, 2024 7:40 am

Being used to noisy burners, it took some time to figure out that the ceramic burner is totally silent. Only a very small turn of the gas valve is needed. The burner starts with a blue flame and then turn into glowing red.
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Don't look down the chimney! :shock:

I don't see any reason to lift the boiler from the footplate with washers. Maybe Mamod has made the holes in the frame larger?

The cylinder was leaking and left a lot of water and oil along the track, so I replaced the o-ring on the piston rod inside the cylinder with teflon string. Now it runs much better and without leaking.
Last edited by rebelego on Tue Jun 11, 2024 3:37 pm, edited 1 time in total.

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Re: Mamod Brunel - Mark 3

Post by Old Man Aaron » Wed May 15, 2024 3:45 pm

The boiler bands really balance the look of the thing. I really do like these little Mamods.
How much are you pulling on that single cylinder, anyway?
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Re: Mamod Brunel - Mark 3

Post by rebelego » Sun May 19, 2024 9:50 am

Old Man Aaron wrote: Wed May 15, 2024 3:45 pm How much are you pulling on that single cylinder, anyway?
Haven't done any explicit pull tests. Load has so far been six small LGB wagons with metal wheels and metal buffer couplings, so heavier than the originals. Running fine at a small layout with very tight curves, ie. Faller e-train track 36 cm radius.


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Re: Mamod Brunel - Mark 3

Post by rebelego » Tue Jul 02, 2024 7:36 pm

I'm no longer able to make the burner glow red. It now burns with a blue and yellow flame, and it is not nearly as efficient.

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Re: Mamod Brunel - Mark 3

Post by Preseli Chris » Wed Jul 03, 2024 2:14 pm

rebelego wrote: Tue Jul 02, 2024 7:36 pm I'm no longer able to make the burner glow red. It now burns with a blue and yellow flame, and it is not nearly as efficient.
Not that familiar with the Mamod ceramic burners , but maybe there is some muck on the burner restricting the airflow resulting in a yellow flame similar to closing the collar on a bunsen burner. Is the gas 100% butane or a propane butane mix ?

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Re: Mamod Brunel - Mark 3

Post by Preseli Chris » Wed Jul 03, 2024 3:01 pm

There is some info here about the Mamod Brunel which may be of some help.



https://www.tapatalk.com/groups/modelst ... 97007.html


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Re: Mamod Brunel - Mark 3

Post by rebelego » Tue Jul 09, 2024 9:59 am

Thanks for the link. I haven't had time to investigate further. Though, I wonder if I have got oil in the ceramic burner. Either steam oil from the exhaust or machine oil spatter from the gears.

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Re: Mamod Brunel - Mark 3

Post by Preseli Chris » Tue Jul 09, 2024 10:16 am

Yes a bit of muck on it. A worst case scenario could be the ceramic burner is cracked. Hopefully not.
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Re: Mamod Brunel - Mark 3

Post by rebelego » Fri Jul 12, 2024 6:28 pm

Problem solved. :lol
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A spider had made a nest full of eggs in the burner tube between the air holes and the burner. The gas jet had blown a small hole in the nest causing the gas to light the burner, but without sufficient air to burn properly. I cleaned the tube with a Q-tip and the burner got the red glow again.

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Re: Mamod Brunel - Mark 3

Post by rebelego » Sun Jul 14, 2024 9:17 am

For the records ...

This is what the choked burner looked like:
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This is about what it looks like when burning properly:
IMG_2539cw800.jpg
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Re: Mamod Brunel - Mark 3

Post by Old Man Aaron » Tue Jul 16, 2024 3:16 pm

You must be relieved to find it was a simple fix. I am! :lol:
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Aaron - Scum Class Works

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