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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rebelego
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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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rebelego
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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 cylinder rod inside the cylinder with teflon string. Now it runs much better and without leaking.

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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?
Regards,
Aaron - Scum Class Works

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