Author Topic: Gasket sizes  (Read 365 times)

Online Angus

  • Suffolk, UK
  • Valued Contributor
  • ****
  • Join Date: Nov 2012
  • Posts: 488
  • Karma: 10
  • The A7
Gasket sizes
« on: 04.08. 2017 11:41 »
1960 A10 and 1961 A7. Just bought new timing cover and primary gaskets., from a supplier some love and some hate but local to me and so when they did not arrive promptly, I want a collected them. Anyway they seam too large/wide lots of over lap on the outside. I have read welsher that the mating surfaces can be irregular, so is this what suppliers are now doing to get around it. Do I just go around with a Stanley blade after its all done up and proved oil tight to clean up the excess (note it is already done up on the A7 and oil tight after a short ride).
 
1961 A7 since 1976
1960 A10 Gold Flash Super Profile Bike
1958 Matchless G80 Project
1952 Norton Model 7 Plunger (becoming a project)

Online JulianS

  • 1962 A10
  • Resident Legend
  • *****
  • Join Date: Mar 2017
  • Posts: 942
  • Karma: 20
Re: Gasket sizes
« Reply #1 on: 04.08. 2017 13:13 »
The new gaskets do seem to be overwide and I think it may just be for manufacturing convenience.

Photos shows a NOS timing cover gasket (wafer thin) laid over an inner cover, it is not as wide as a new one but still does not fit perfectly.

Edge trimming is the only way with new, or make your own with a suitable material.

Online Angus

  • Suffolk, UK
  • Valued Contributor
  • ****
  • Join Date: Nov 2012
  • Posts: 488
  • Karma: 10
  • The A7
Re: Gasket sizes
« Reply #2 on: 04.08. 2017 13:42 »
Thanks Julian

I will get the Stanley Blade out.

These have about 1mm sticking out almost all around. Appeared to fit wel on offer up and ok with some screws in to hold in place as I was not sure.
1961 A7 since 1976
1960 A10 Gold Flash Super Profile Bike
1958 Matchless G80 Project
1952 Norton Model 7 Plunger (becoming a project)

Online BSA_54A10

  • Wise & Enlightened
  • *
  • Join Date: May 2008
  • Posts: 1944
  • Karma: 32
    • BSA National
Re: Gasket sizes
« Reply #3 on: 05.08. 2017 10:15 »
Get a scapel from a hobby store and use that or a linoleum blade is Stanley still make them or you will not be able to follow the internal curves.
Bike Beesa
Trevor

Offline bikerboy

  • Valued Contributor
  • ****
  • Join Date: Dec 2011
  • Posts: 336
  • Karma: 4
Re: Gasket sizes
« Reply #4 on: 15.08. 2017 00:18 »
Even more worrying are the latest sets of rocker box gaskets we seem to be getting

A friend of mine done a top end overhall and within 15 miles oil was pouring out. As a favour I took the rocker box off at the weekend new gaskets etc and within a mile it had blown in exactly the same place.

Both head and rocker box have been faced up but the gasket is only catching my about 2 mm at the front of the rear compartment if you know where I mean about 10 mm from the bolt.

I am ordering a set of copper ones now taking your rocker box off 3 times in 15 miles is not how I like to spend my time  *smile*