Greeves Riders Association Forums   Greeves Riders Association Forums Not signed up? Send an email to contact@greeves-riders.org.uk requesting access.
Find out more about GRA membership and how to join here.
   

Go Back   Greeves Riders Association Forums > Machine-specific forums > Road machines

Reply
 
Thread Tools Display Modes
  #1  
Old 13/11/2017, 11:44 AM
John Wakefield's Avatar
John Wakefield John Wakefield is offline
GRA Member
 
Join Date: Mar 2010
Location: Cambridgeshire UK
Posts: 5,931
Default 2T 3T 4T exhaust sealing rings

As many of you will know, sealing the exhaust pipes to the cylinder barrels can be a problem, resulting in sticky black goo dripping from the joint, particularly on 4T engines.
The problem is the composite ring gasket, originally these were made with asbestos filling but with that now banned, the replacement material used in these is not as good, this coupled with the size of repro ones being of smaller section results in a poor seal.
I made some solid ones up or my 4T engine some time ago and after initial bedding in they do not leak, I made mine out of soft aluminium, but a better material would be copper. I attach a drawing for the ring, which you will see has a square profile thus giving a larger sealing area. Before fitting, and when refitting exhaust system, the copper should be annealed by heating on a gas ring to a dull red & quenching in water, this softens the copper so it beds in to make a good seal. This type of solid gasket can be used several times where as the old composite ring needs replacing each time the exhaust is dismantled.
Attached Thumbnails
DSC06216.jpg  
Reply With Quote
  #2  
Old 13/11/2017, 03:27 PM
merlin merlin is offline
GRA Member
 
Join Date: Apr 2010
Location: Blackpool
Posts: 154
Default

Thank you John that should solve another problem if I ever get running again.
Reply With Quote
  #3  
Old 13/11/2017, 06:01 PM
starider starider is offline
GRA Member
 
Join Date: Jun 2015
Location: Nr. Holsworthy DEVON
Posts: 90
Default Exhaust sealing rings

Sounds good John,just to say each time you re-use a copper ring it would help to anneal it again..............................starider
Reply With Quote
  #4  
Old 15/11/2017, 12:21 PM
John Wakefield's Avatar
John Wakefield John Wakefield is offline
GRA Member
 
Join Date: Mar 2010
Location: Cambridgeshire UK
Posts: 5,931
Default

Lasermaster https://www.lasermaster.co.uk/easy-order can supply these in copper or aluminium. For aluminium, copper are 4 times as expensive and aluminium will do the same job, I have use alloy ones myself in a 4T engine with good results, no black goo, the prices are as follows:
2 off 2.70 each
4 off 2.34 each
6 off 2.14 each
prices include vat & postage.

Note Lasermaster will make other sizes of washers and other shapes

Last edited by John Wakefield; 15/11/2017 at 01:04 PM.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 08:19 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.