Hello All,
I have just put the primary side (less clutch plates etc) in to my Navigator engine and--when vainly looking for a clutch puller on the web site. I noticed two items--a nylon type primary chain adjuster and a chain tensioner backing plate.
The primary side on my old thing does not seem to have suffered as much abuse as other areas but--what I am assembling is what I got--there was no backing plate. I have a mind to knock up said plate--it appears to be about 2mm in thickness judging by the two fat washers some one seems to have stuck on the screws
What is the story with the Nylon one--there are few marks on the steel one I have although most of the slots seem to have been taken up tensioning the other reasonable looking chain.
Any thoughts anyone?
JPA
Attachments primary-drive-jpgHi JPA The first Jubilees…
Hi JPA
The first Jubilees had a metal Pri Chain Tensioner (20778), that was (hard?) chromed on the slipper face. These did the job very well - but maybe they were costly to manufacture, or noisy in operation, or ...whatever.
The powers that be knew best, so a Nylon Block was used instead (20779). Cheaper?, quieter?, easier to assemble?, ...etc.
BUT, the metal ones would survive a trip without oil - the nylon ones do not! Worse than that (as I found to my cost once), when the nylon melts (an unlubricated chain runs VERY hot), it gets in everywhere and the chain is scrap.
The nylon block is assembled with a 'backing plate' (23677) which I would put on the outside - the chaincase itself provides the backing....
The original nylon ones where off-white in colour - NOC now stocks a black version
Attachments 20778-9-tensioner-pnghere is an example of an o…
here is an example of an original white nylon one in use, with the 'backing' washer shown outboard
Attachments pri-chain-jpgPreviously andy_sochanik w…
Previously andy_sochanik wrote:
here is an example of an original white nylon one in use, with the 'backing' washer shown outboard
I see--thanks for that Andy--I'll stick with the steel one I think--is has hardly a mark on it.
Cheers
JPA
Previously John Pullen-Appleby wrote:
Hi John,
just checked mine, only have the nylon one, my guess is it is quieter.
Andrew