Layrub Couplings

Comfortable talk! email JCC UK Registrar. Technical Question? Try Service Bulletins or TechNotes or Tech Library or Parts book first. Note that you need to be a club member to view the Tech Library..

Paul Wilks' Javelin was shortlisted for Classic Car of the Year 2013.
Post Reply
David Morris
Posts: 837
Joined: Thu Feb 09, 2006 9:23 am
Your interest in the forum: Jowett Javelins since 1964. Now a Jowett Stationary engine owner and club member since 1964.
Given Name: David
Location: Sunny Bristol

Layrub Couplings

Post by David Morris »

Hi there,

I have heard somewhere that it is now recommended to use new Nyloc nuts on the bolts holding the Layrub Couplings. Thus would avoid the pain of getting the original castellated nuts to line up and result in the correct torque settings.

Can anyone confirm this as a good idea and recommended practice?

Many thanks,

David
Keith Clements
websitedesign
Posts: 3968
Joined: Wed Feb 08, 2006 11:22 am
Your interest in the forum: Jup NKD 258, the most widely travelled , raced and rallied Jowett.
Given Name: Keith
Contact:

Post by Keith Clements »

They have been on Jen's Javelin for 30 years.

On the Jupiter I do not use Nyloc; but use Loctite rather than pins for locking. In many years of competition, I have had no problem.

The MOT person may fail the car, if he sees a castellated nut without a pin. they should be so tight anyway that they should not shake loose.

One issue may be balancing the shaft, as the Nyloc may be heavier than the original.
skype = keithaclements ;
Forumadmin
Site Admin
Posts: 20648
Joined: Tue Feb 07, 2006 5:18 pm
Your interest in the forum: Not a lot!
Given Name: Forum

Post by Forumadmin »

Altering the weight at one end of the shaft would alter the centre of gravity of the shaft and hence its balance. The shaft axis of rotation may well not pass through its CG, thus even if the layrub nuts are balanced around their axis of rotation they may alter the balance of the whole shaft's balance. Anyway there may be play and other angular or positional differences that mean the layrub CG is not actually on the axis of its rotation. After all it is a rubber joint!
David Morris
Posts: 837
Joined: Thu Feb 09, 2006 9:23 am
Your interest in the forum: Jowett Javelins since 1964. Now a Jowett Stationary engine owner and club member since 1964.
Given Name: David
Location: Sunny Bristol

Layrub Couplings

Post by David Morris »

Hi there,

Thanks for all the advice. It looks as if the summary of the useful tips that have come in is that, if I replace all the couplings (as I had planned to do anyway as they are all look a bit tired and I managed to pick up some new ones from an autojumble) and use new Nylock nuts, then everything should be OK?

Many thanks,

David
Post Reply

Return to “Javelin”