Camshaft comparison: Dursley vs Rajkot

[Hugh Conway]

This afternoon, I was comparing a pair of 6/1 camshaft assemblies. One is an original Dursley, the other is a NOS Listeroid part that was modified by John Ferguson to relocate the lobes per Dursley spec. So far, so good.
I noted that on the listeroid cam, the governor sleeve has a pin that prevents the counterweights from rotating a full 360 degrees on the sleeve. The Dursley governor sleeve (p/N 3165) has no pin. The Dev Engineering part manual shows this pin whereas the old Dursley parts manual shows no pin.
Any information as to why the Indians added this pin? Did Lister add this pin in later models?
Curious.
Cheers
Hugh

[broncodriver99]

You talking about the one pictured below that runs parallel to the bore? Every original cam I have seen has had one. May have been something that changed early on in production.

I just looked in my original parts book and they do show the pin installed in the sleeve in the illustration buy do not list it seperately. There are 4-5 parts in a CS that were sold as assemblies from Lister.

[Hugh Conway]

@ Broncodriver

Yes, that's the part. My parts book is an early one, shows no pin.
The actual part on the cam has no pin, no hole for a pin and is stamped with the original part number 3165.
Maybe an early change then. I have no idea of the date of mfg of that cam.
Cheers
Hugh

[broncodriver99]

Sounds like it may be something they identified and changed along the way in earlier years of production. The earliest CS I have been into was a 1952. I'm not sure what year exactly Lister went from the 4 digit part numbers to the hyphonated 5-6-7 digit part numbers, I feel like it was mid to late 40's to the 5 digit and then they kept adding another digit every decade or so.

[AdeV]

Sounds like it may be something they identified and changed along the way in earlier years of production. The earliest CS I have been into was a 1952. I'm not sure what year exactly Lister went from the 4 digit part numbers to the hyphonated 5-6-7 digit part numbers, I feel like it was mid to late 40's to the 5 digit and then they kept adding another digit every decade or so.

The hyphenated style was quite late (1970s? Maybe even 1980s). The straight incrementing number survived until 1952, when they went to the No|Type|Rotation|Year style (but no hyphens).