classic car forum header
Classic cars forum & vehicle restoration.
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
How To Register     Posting Photographs     Privacy Policy     F/book facebook.com/oldclassiccar

Gearbox goo - which?
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Mechanical Restoration
Author Message
jessejazza



Joined: 18 Mar 2009
Posts: 75

PostPosted: Sun Jun 14, 2009 12:06 pm    Post subject: Gearbox goo - which? Reply with quote

I'm just in the middle of a gearbox rebuild.

As one of the gaskets isn't available and it is a bit fiddly to make up one i was thinking of using a goo. I think that is what someone used on the entire gearbox on a previous car - pro rebuild i think. Is it green Hermetite that is used as it is hard setting as opposed to the red which is semi hardening?

Instant gasket i have heard people speak good of... i tried it once and didn't think much of it but i do believe in "goo speak" - they must be correctly applied [which may not necessarily be what is in the instructions.

e.g. hylomar - does work well but needs 3/4 hour to virtually dry hard and then works fine rather than the 10 or 15 mins on the instructions.

What have other folk done in a similar situation.
thanks
Back to top
View user's profile Send private message
Nic Jarman



Joined: 05 Oct 2008
Posts: 1035
Location: Stoke by Clare, Suffolk

PostPosted: Mon Jun 15, 2009 1:14 pm    Post subject: Reply with quote

If I have good surfaces I use Hylomar but if they are a bit ify or flexible I use instant gasket. The trick to using instant is to put an even layer on one surface then gently press the other surface into place but DO NOT tighten. Leave the instant to cure for an hour(ish) and then do the final tighten. Always when using any compound that sets leave a bit on some paper so you can see if it has set without disturbing the job.
_________________
1936 Morris 8 Series 1
1973 MGB roadster
1977 MG Midget 1500
Dax Rush
Back to top
View user's profile Send private message Visit poster's website
PAUL BEAUMONT



Joined: 27 Nov 2007
Posts: 1279
Location: Barnsley S. Yorks

PostPosted: Mon Jun 15, 2009 1:32 pm    Post subject: Reply with quote

Quick thought: Be careful if the gasket was part of the tolerance stack up in the assembly Gaskets can be anything from a couple of thou (0.05mm) to 0.030 (0.75mm) thick. Instant gasket will reduce this to almost nothing and you may end up overtightening bearings etc.
Paul
Back to top
View user's profile Send private message
jessejazza



Joined: 18 Mar 2009
Posts: 75

PostPosted: Mon Jun 15, 2009 7:32 pm    Post subject: Reply with quote

Paul - good point however this gasket is a thin paper one on the rear cover so i don't think it'll matter. It's just too fiddly to cut from thin gasket paper.

Nic - thanks for the tip i think i'll have to try instant gasket.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Mechanical Restoration All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Forum T&C


php BB powered © php BB Grp.