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Lister D Carburetor Advice


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  #1  
Old 03-05-2019, 08:48:16 AM
perthlisterfan perthlisterfan is offline
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Default Lister D Carburetor Advice

Hello all,
I'm hoping someone can help me out. I'm doing up an old Lister D and I'm working on the carby at the moment. It stripped down easy enough and I have cleaned it all up. However it was missing the banjo bolt that holds the fuel bowl in place, so I got one off eBay from England. However imagine my surprise when it only screws in about 6 threads and then stops. Have checked the thread of the Banjo bolt with a thread guage and it looks to be 19 tpi, 55 deg. However the internal thread looks to be 16 tpi, 55 deg.
So my question is this. Did Lister change their thread type on their fuel jet inlet / banjo bolts at some stage?
Cheers
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  #2  
Old 03-05-2019, 11:47:50 PM
cobbadog cobbadog is offline
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Default Re: Lister D Carburetor Advice

I have no idea what it should be but in the mean time ask the supplier if there is one with 16TPI
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Old 03-06-2019, 05:53:12 AM
perthlisterfan perthlisterfan is offline
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Default Re: Lister D Carburetor Advice

Thanks Cobbadog for answering. The chap reckoned it should have fitted which made me wonder if there was an early and late version of the banjo bolt and the fuel jet. Therefore I am thinking I have a mismatched set.
My other option is to find someone nearby and see what their Lister D banjo bolt looks like.
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Old 03-06-2019, 06:22:30 AM
Ray Freeman Ray Freeman is offline
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Default Re: Lister D Carburetor Advice

I would imagine if you can't find one it would be a simple job to machine one
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Old 03-06-2019, 08:41:37 AM
perthlisterfan perthlisterfan is offline
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Default Re: Lister D Carburetor Advice

Hi Ray,
After exhausting the purchase option I might have to go down the machining a replacement route. I do not have a lathe, but my mate does. Only problem it will cost me a lot in beer!
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Old 03-06-2019, 02:06:41 PM
georgineer georgineer is offline
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Default Re: Lister D Carburetor Advice

The 19 TPI Whitform thread would most likely be 1/4" BSP (OD 0.518") which, under a different name, is part of the current ISO pipe thread standard.

The 16 TPI thread would most likely be 1/2" BSF, though I'm surprised that the threads would engage as much as you say.

George

Taps and dies for both threads should be readily available.
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Old 03-06-2019, 11:35:41 PM
cobbadog cobbadog is offline
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Default Re: Lister D Carburetor Advice

Does the bolt need to be brass as well? If not buy the bolt with the right thread and get out the drill.

The tricky part is getting the correct TPI. Another possibility for thread pitch is BSB for brass.

My local nut n bolt shop has some BSF stuff but they are hand made locally. But can be bought from the UK but again at a price. In the mean time try to discover the right TPI and maybe then get a die to suit and make it. I have BSW & BSF up to 1/2" but no BSB.
Your mates lathe can become your best option and if it is an imperial lathe can cut the BSW & BSF threads easily. If it is a metric lathe your mate will need some real skills.
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Old 03-07-2019, 03:05:28 AM
perthlisterfan perthlisterfan is offline
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Default Re: Lister D Carburetor Advice

Hi Cobbadog,
No the fitting does not need to be brass and I agree, steel would work just as well.

As I have three Lister D's I tried the banjo bolt off one of the others and it screwed into the carby beautifully. Did a check on the male thread and the thread gauge says 16G 3/8. The OD of the thread was very close to 5/8".

The other issue is to get a neat seal between the banjo bolt and the float bowl fuel delivery ring which the banjo bolt passes through. I would need to machine a bit of the head down so that it slips inside the ring.

The challenge continues!
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Old 03-07-2019, 09:08:08 AM
Ray Freeman Ray Freeman is offline
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Default Re: Lister D Carburetor Advice

It sounds simple enough. If you wanted to bring a sample to me including all the bits I would have a look at it.
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Old 03-08-2019, 01:03:01 AM
cobbadog cobbadog is offline
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Default Re: Lister D Carburetor Advice

Some of the carbies on my old mowers use a fibre washer between the bolt head and bowl or against the banjo fitting as the case on our Cropmaster tractor. Now that may not be original but it works and if anyone pics it tell them to get a life.
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