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Discussion Starter · #1 ·
I recently purchased an unrun AC K1 Garrett shelf queen. After doing the usual inspection and prep, the engine was fired. Pressure came up to 60psi promptly and, after clearing the condensate, it was sent off at a moderate pace and ran flawlessly. After about ten minutes, the pressure had dropped to 35 pounds, and some reasonable adjustment to the gas did not seem to help. When one of these engines was reviewed upon initial release about +/_ten years ago, this pressure issue was noted, but with no discussion of a fix.
Before I start the usual ritual of troubleshooting, does anyone out there have experience in solving this issue with this specific engine (this engine model has some rather unique flexible steam lines due to its mechanical suspension)

Larry
 

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Any obvious leaks? From steam or gas? With your persimmon I'm reposting your problem on the 16mm FB pages here in UK, where the CEO of Accucraft UK, Graham Langer, is a frequent poster. Also a daily reader is the principal Accucraft fixer, David Mees, over there in Gogledd Cymru.

I'll repost their resplones.
 

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Okay - just ten minutes later, and already these comments - the loco is a Beyer-GarrAtt, just so's you'd know.
  • Jonathan Carter/Tony Willmore
    Do you know if it’s had the water bath mod?
    It’s also worth checking the steam connections around the superheater (both ends) are tight.

  • Yes, wasn't there an issue with gas tank warming (or the lack of it) on these? The couple I have seen have been modified after a late-stage design change.

    Oh, and its GarrAtt. Garretts made road engines.

    Author

    Tony, I'm quoting verbatim - there are TWO Garretts in my village, one of which I've had the pleasure of firing.

  • Tac Foley
    Author

    Thanks for that idea. As it seems to have been an unmodified shelf-queen all its life until Larry bought it to run, I'm guessing that any in-life mods have passed it by. I'll pass on your words of wisdom.
 

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More -
Mike Bickford
Definitely sounds very much like a problem with the gas tank getting chilled. My one had a pipe coil under the gas tank that was heated by exhaust steam from the back engine unit, risking over pressuring of the gas tank in warm conditions. I removed the heating coil, fitting a brass strip and sealant to form a water bath for the underside of the gas tank. all in accordance with instructions and photos from David Mees, who has quite a bit of knowledge on these engines.
 

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Discussion Starter · #6 ·
I recently purchased an unrun AC K1 Garrett shelf queen. After doing the usual inspection and prep, the engine was fired. Pressure came up to 60psi promptly and, after clearing the condensate, it was sent off at a moderate pace and ran flawlessly. After about ten minutes, the pressure had dropped to 35 pounds, and some reasonable adjustment to the gas did not seem to help. When one of these engines was reviewed upon initial release about +/_ten years ago, this pressure issue was noted, but with no discussion of a fix.
Before I start the usual ritual of troubleshooting, does anyone out there have experience in solving this issue with this specific engine (this engine model has some rather unique flexible steam lines due to its mechanical suspension)

Larry
I recently purchased an unrun AC K1 Garrett shelf queen. After doing the usual inspection and prep, the engine was fired. Pressure came up to 60psi promptly and, after clearing the condensate, it was sent off at a moderate pace and ran flawlessly. After about ten minutes, the pressure had dropped to 35 pounds, and some reasonable adjustment to the gas did not seem to help. When one of these engines was reviewed upon initial release about +/_ten years ago, this pressure issue was noted, but with no discussion of a fix.
Before I start the usual ritual of troubleshooting, does anyone out there have experience in solving this issue with this specific engine (this engine model has some rather unique flexible steam lines due to its mechanical suspension)

Larry
Hello Tac--first, thanks for spreading my post across the pond, and to those who have responded so quickly.

So, a list is forming: check superheater pipe connections; add partition to tank for waterbath; check that both burners are igniting; check/replace flex hoses. The waterbath sounds promising; I didn't think to look for icing of the gas tank.

I normally stay with North American prototypes, but when I found this engine it appealed to me. I can justify it because there is a former SAR Garratt on a private railroad on a ranch in Texas.

It will be a bit before I can get back to the engine, but I will check back with the results. Thanks again.
Larry
 

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Larry - the Accucraft CEO, Ian Pearse, and the gentleman who works with him as an authorised repair and rebuilt specialist, Dave Mees, have offered to help you solve the problem.

This is from Ian Pearse -

Ian Pearse
All UK sold K1 Garratts were supposed to have been sent back to Accucraft UK and were retro fitted with a water bath, like the early Accucraft NG16 Garratts. If this is a model purchased in the USA I guess it doesn't have this modification. Dave Mees might be able to help with instructions on how to do it.

So, ALL the UK-bought models got the fix, but NONE in the USA ever did, understandable when you realise that the model was sponsored by a UK dealer and aimed squarely at the UK's mostly 16mm scale audience.

If you message me your email, I can connect you with Dave Mees right now - or if you are on Face Book - message him ASAP.

David Mees

Tac Foley PM me old pal..or have your pal do it.


 

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Just got this from Simon Whenmouth - Anything Narrow Gauge owner -



Hi Tac
Yes we can help you need to look at the back of the cab and see if it has a modified loop or the original. The original goes under the tank the modified one goes round right curves in the cab.
The jets need changing for English ones to left no5 and right no3 also the gas valves needs upgrading to the fine ones we sell avTD 75. (?)

Other than that I changed the pressure gauge on mine to a 0 to 80psi gauge.

When steaming gets I tend to fill mine with gas the night before so the gas has time to reach room temperature.I then fill the boiler to a 1/3 full buy the time it’s in steam you will see 2 thirds of a glass.

When running I usually have approximately 20psi on the clock and mine will pull a house down it’s. Steady plodder but they do take some running in.

If the Loco was originally sold by me I’ll happily send these bits on FOC

Cheers Simon,
Anything Narrow Gauge
 

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Discussion Starter · #10 ·
OP, you still there?
Yes, I'm back thanks to Tom B.--you guys move a lot faster than I do these days.
I have no knowledge of the original sale--purchased mine from a dealer of brass trains, mostly HO, in Ocala FL. The serial # is: 086.
The gas hose passes thru a J shaped opening in the partion just in front of the gas tank, which is slightly off vertical with an open slot in the floor, then passes into the cab via a rectangular opening. Before coming up with my own bits of brass to form a reasonable sized water bath, I would like to know what Simon or David came up with.
This coming week is a bit busy with health and visiting family matters, but I will be emailing them both as I can get to it.
My email is: larry [email protected] gmail.com
Thanks again,
Larry
 

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I've sent you email address to Dave Mees. Likely you'll hear from him. He is VERY go-gettish. Take a look on Youtube at his remarkable railway - the Llanrwst & Wigfa. He lives on a slate-covered hillside in NW Wales - the scenery is all natural, lucky beggar. The spelling is correct, BTW, this is Wales, and people speak Welsh.
 

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Discussion Starter · #13 ·
Bad enough I misspelled Garratt, now I mess up my own email. Some things don't seem to be working as they should, these days.
Larry
 
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