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1939 RH 'R' stamping

Posted: Sat Dec 05, 2015 1:27 pm
by alan.moore
1939 RH500: Wondering whether anyone can shed some light on the relevance of a letter 'R' being stamped on the left hand crankcase next to the ARIEL logo

IMG_0516.JPG
'R' stamping


Cheers

Alan

Re: 1939 RH 'R' stamping

Posted: Mon May 20, 2019 12:09 am
by alan.moore
Posted this three years ago and got no replies...so it is possible that these R stampings are not all that common. Well I think I may have found the answer. The engine is from my '39 VH and I think the 'R' stamping may relate to the engine being fitted with Roller bearings. Apparently pre war Matchless sometimes also stamped an R to identify Roller bearings being fitted.

Cheers
Alan

Re: 1939 RH 'R' stamping

Posted: Mon May 20, 2019 1:51 am
by john.whiting
I wouldnt put too much stock in a stamp on a crankcase,anyone can do it.

Re: 1939 RH 'R' stamping

Posted: Mon May 20, 2019 8:31 pm
by Vincent.vanGinneke
Have that also on my 1940 crankcase and the inner timing case.

R on crankcase (2).JPG


R on crankcase (1).JPG


R for Ron, Ralph, Roger, Roderick or..... Racing !! :lol: :lol:

Re: 1939 RH 'R' stamping

Posted: Mon May 20, 2019 9:18 pm
by alan.moore
Vincent...well that seems to confirm it was a factory stamping. I've had a look through the photos of my restoration and there is an R stamped on my timing side crankcase in the same positions as yours. If your crankcases are from a machine that would have originally had rollers both sides i.e a VH then I think it is safe to assume that the R denotes Roller bearing OR as you say Racing :D .
SDC11295.JPG


Cheers
Alan

Re: 1939 RH 'R' stamping

Posted: Mon May 20, 2019 9:46 pm
by andrewhawkswell
Also on this VA
crankcase R inverted.jpg
crankcase R inverted.jpg (36.52 KiB) Viewed 660 times

Re: 1939 RH 'R' stamping

Posted: Mon May 20, 2019 11:03 pm
by simon.holyfield
Are these parts that were Rectified following some fault turning up during inspection?

Re: 1939 RH 'R' stamping

Posted: Mon May 20, 2019 11:20 pm
by alan.moore
Simon, Yes that is a possibility.

The parts books shows the same part number for the OHV and SV engine crankcases so, Andrew, is it possible that the crankcase you show was originally from a VH i.e does it have a VH engine number?

Cheers
Alan

Re: 1939 RH 'R' stamping

Posted: Tue May 21, 2019 12:44 am
by nevhunter
Funny they have the same part number. The VA, VB has an extra hole for oil to drain from the tappet area. VA VB VG VH of the period all share the same engine prefix. Nev

Re: 1939 RH 'R' stamping

Posted: Tue May 21, 2019 1:28 am
by andrewhawkswell
Alan - could be I guess, anything is possible.