Mamod engine is a non starter

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Mamod engine is a non starter

Cbwho
Junior Member
Cbwho
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Joined: February 9th, 2018, 8:53 pm

May 22nd, 2018, 11:40 am #1

From a pile of parts, I assembled my shorty Mamod tractor. However, after steaming it up, it only leaked steam between the cylinder frame and cylinder. I've tested the cylinder on another tractor and it produces good power.

I am thinking I should sand the port face flat with 1000 grit using a piece of glass. Should I try to build up the surface with tinning flux? It's lead free. Would the Tin make a better bearing surface?

I did have to resolder the line going into the boiler, I'd be surprised if that is plugged up.
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tiger1john
Steam Legend!!
Joined: June 28th, 2017, 8:57 pm

May 22nd, 2018, 11:45 am #2

CB maybe it is not the cylinder, but the force it is being asking to produce? Too much friction?
John
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Roly Williams
Honorary Life Member
Joined: August 2nd, 2006, 5:11 pm

May 22nd, 2018, 12:16 pm #3

Is the exhaust pipe blocked? 
Have Fun
Roly

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MrMamod
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MrMamod
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Joined: January 3rd, 2010, 8:13 pm

May 22nd, 2018, 5:28 pm #4

Is there enough tension to hold it onto the port face.
Desperately seeking ( NOT Susan ) Mamod Minor Burners of ALL types :-)
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Ironhorse57
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Joined: May 29th, 2014, 10:54 pm

May 22nd, 2018, 6:13 pm #5

Do the ports line up properly with the hole in the cylinder?

Dave 
Patience, perseverance and pig-headedness masquerading as engineering skills

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Dr. Rog
Steam Supreme Being
Joined: December 30th, 2008, 5:53 pm

May 22nd, 2018, 8:00 pm #6

"only" as in did nothing else?
Cheers Rog https://www.youtube.com/user/DrRogB/videos New positive, and successful motto for 2017: carpe diem
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Cbwho
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Cbwho
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Joined: February 9th, 2018, 8:53 pm

May 22nd, 2018, 8:33 pm #7

The spring pressure feels the same as others. I don't have the tiny washer however.

I tried it on the air compressor thru the whistle port. I noticed an odd thing, the lever needs to be extremely far forward to get power. I think it needs to be notched. That red lever came with the cylinder frame, so I am surprised by this. 20180522_150222-1.jpg

It does seem to be running better after the air compressor, so maybe there was sludge in the line? But then again this observation may be due to me discovering the far forward lever arrangement?? My other TEs don't require slamming the lever do far forward.
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Cbwho
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Cbwho
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Joined: February 9th, 2018, 8:53 pm

May 22nd, 2018, 8:39 pm #8

Ironhorse57 wrote:Do the ports line up properly with the hole in the cylinder?

Dave 
I think that is part of the problem. I am perplexed by this. I thought they were a matched pair...
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Ben
Hero Steamer
Joined: March 22nd, 2010, 12:23 pm

May 22nd, 2018, 9:24 pm #9

Nice job, its a cool wee shorty 😎👍
All the best,

{ Ben }





♠ R.I.P Lemmy, Phil & Eddie ♠
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Rolling Boil
Steam Legend!!
Joined: May 17th, 2016, 7:09 am

May 22nd, 2018, 9:28 pm #10

How does it go in reverse? Is it the same, worse or better?
Also worth checking if the engine frame is square and also not 'tipped' a little on the firebox.
The levers can be a little awkward but I have found that swapping them swiftly between forward and reverse can get them to settle in place.
I love what you've done with it and don't fret - it will run in the end, they always do🙂

Graham
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