Friction Damper Knob Genuine Nos 46-7040

Vincent.vanGinneke
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Friction Damper Knob Genuine Nos 46-7040

Postby Vincent.vanGinneke » Wed Jul 25, 2018 7:48 pm

The one year only (1940) girder fork friction damper knob.

https://www.ebay.co.uk/itm/Ariel-Motorc ... SwLwNbKjT6

s-l1600 (1).jpg

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Re: Friction Damper Knob Genuine Nos 46-7040

Postby wade.edwards » Sun Sep 02, 2018 9:26 pm

Vincent, what make you say that this damper knob is for one year only 1940? I can't see in parts books where it is listed. The 1940 book lists a 1938 knob.

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Re: Friction Damper Knob Genuine Nos 46-7040

Postby Vincent.vanGinneke » Mon Sep 03, 2018 11:40 am

Hello Wade, if you look up in the knowledge base the 1940 sales leaflet it shows this damper knob. Only year I have seen it in a catalog

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Re: Friction Damper Knob Genuine Nos 46-7040

Postby wade.edwards » Mon Sep 03, 2018 4:48 pm

That is interesting, Vincent. I can see that the problem with installing one on a 1940 machine is having to convince anyone who asks about it that there is only an obscure reference to it in a brochure. I don’t have a close up brochure picture. Do you?

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Re: Friction Damper Knob Genuine Nos 46-7040

Postby Vincent.vanGinneke » Mon Sep 03, 2018 5:02 pm

Hi Wade, that’s the fun of it. ATM i cant find the pic but it was no better then the one on the sales leaflet

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Re: Friction Damper Knob Genuine Nos 46-7040

Postby wade.edwards » Mon Sep 03, 2018 5:35 pm

I’ve emailed the seller to ask for more details. In the listing two parts numbers are used; one using a 46 prefix and one using a 47 prefix.
Surely that number indicates a 1946 production date. Quite a mystery. Is there anyone in the Club with a 1940 model using this knob?

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Re: Friction Damper Knob Genuine Nos 46-7040

Postby alan.moore » Mon Sep 03, 2018 8:03 pm

The part number for the chromed bar type adjuster (labeled adjusting nut) is 4670-34 and appears in the 1939 parts book. This part number also appears in the 1947 parts book. The Bakelite knob is therefore likely to be part number 4670-40, as this number would follow Ariel's normal stance of keeping the main part number the same and only updating the year suffix.

Regarding the dated 1940 sales catalogue ....I believe the 1940 models (as was the norm with the release of the next model year) would have normally been released in September 1939, so Ariel no doubt would have had the 1940 catalogue go to print a couple of months before War was declared on 3rd September. It shows the Torpedo rear lamp, so it would appear that Ariel intended to carry this lamp over from the 1939 year model and shows the 'bar type' 4670-34 damper adjuster, so no evidence that the Bakelite knob was intended to be used on the 1940 civilian model.

Looking at the 1940 / 1941 WNG parts list it does list the adjusting nut as 4670-40, although the picture shows a basic 'nut' as opposed to a bar type adjuster or a Bakelite knob. Such a nut would have needed a spanner to adjust and the serrations machined on the rear. A nut which needs a spanner to adjust 'in the field' does not really make much sense. So is it a case that the artwork is incorrect and that the Bakelite knob was intended as an WNG addition.

The sales brochure that is shown on the website as 1946 (with a rider that it is not dated but believed early post war) clearly shows the Bakelite knob on all models. It also shows the 1939 /1940 Torpedo rear lamp. The artwork has therefore clearly been updated since 1940 and clearly shows the knob shown in the Ebay listing.

The War did not end till Autumn 1945 so it is unlikely that Ariel produced a 1945 brochure. The undated (shown as 1946) brochure cannot be a 1940 brochure as we already have a dated one of those, and it shows girder forks whereas the 1947 one shows the newfangled telescopic forks. So the assumption that it is 1946 seems to be supported.

The Bakelite knob is clearly a rare anomaly but, given that someone has a few of them, shows that it was produced. Hopefully someone in the club will be able to enlighten us.

The WNG parts book gives a drawing number of D10/175. I wonder if Paul Jameson or anyone else who has access to the Ariel parts drawings can see if this is included in those.

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Re: Friction Damper Knob Genuine Nos 46-7040

Postby wade.edwards » Tue Sep 04, 2018 1:01 am

I have had to grease up for the slide down the rabbit hole. Where is the bottom?
Don’t know how anyone can look at the brochure pics and say that the steering damper knobs are not the regular 1938 style. I just can’t make that leap.
I did note that the 1940 brochure shows the VH model without the torpedo lamp, while the 39 brochure shows all models fitted with torpedos. Interesting to anoraks. Mine is a 40 VG so am safe.
Yes, it would be great if Paul could show a factory drawing for this supposed one year only damper. The number of files to sort through would make the rabbit hole search prohibitive.
I am still disappointed the Club dismissed the idea of digitizing the files and organizing the files to be available on line for all members.

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Re: Friction Damper Knob Genuine Nos 46-7040

Postby alan.moore » Tue Sep 04, 2018 12:06 pm

Wade,
Are we looking at the same part ?. It is not the steering damper knob, it is the friction disc type damper adjuster for the girder forks themselves.

Re the 1940 brochure showing the VH without a torpedo rear lamp the picture also has the auxiliary springs on the girders missing, so must have been a mistake when they selected the artwork.
1939 VH Redhunter;1942 RN WNG;1951 Triumph 6T Thunderbird;1970 BSA B175 Bantam;1986 Yamaha SRX600 single
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Re: Friction Damper Knob Genuine Nos 46-7040

Postby wade.edwards » Tue Sep 04, 2018 4:16 pm

Looking only at the knob, Alan. as pictured in the eBay listing. So, if Ariel misprinted one image, how reliable are other images? No reply yet from the eBay lister.


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