Author Topic: spring n' ball  (Read 830 times)

Offline spyke

  • Dorset, England
  • A's Good Friend
  • ***
  • Join Date: May 2009
  • Posts: 135
  • Karma: 0
spring n' ball
« on: 10.10. 2010 20:23 »
Hi chaps,

Nearly got all me bits collected to put bottom end back together,two quesions before I start.

1-I have taken out the ball and spring in the crankcase for examination thought I would renew so sent off to SRM and they sent me new ones only thing is the spring is quite a lot different in that it is quite a bit stronger, also the ball is a different dia? bearing in mind where this is and how important it is which one is right?

2-What sealent to use on the centre crankcase join, my instinct would be to use a sparingly thin layer of silicone ,but any other thoughts on this?

Many thanks Spyke
A10 spitfire style

Offline a10gf

  • Wise & Enlightened
  • *
  • Join Date: Sep 2006
  • Posts: 2961
  • Karma: 45
  • West Coast, Norway & Alpes Maritimes, France
    • A10 GF
Re: spring n' ball
« Reply #1 on: 10.10. 2010 20:44 »,3066.msg20796.html#msg20796

This is from a plunger case, am supposing the later crankcases use the same spring & ball dia.
Maybe SRM sent parts for the Oil Pressure Valve ?

how important it is
Too loose > oiltank drains into crankcase (wetsump), too tight\stuck > oilflow stops (catastrophy).

A10 GF '53 My A10 website
"Success only gets you a ticket to a much more difficult task"

Offline MG

  • Resident Legend
  • *****
  • Join Date: Dec 2009
  • Posts: 949
  • Karma: 23
Re: spring n' ball
« Reply #2 on: 10.10. 2010 20:53 »
The ball for the anti syphon valve is 1/4" in dia for the plunger as well as for the s'arm models (also for the A50/A65 models btw).

I guess Erling is right, probably they sent you the spring and ball for the pressure valve, not a good idea to fit that in the crankcase I'd say.

For the crankcase joint I use Hylomar (very sparingly!)
1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR - Restoration, Repairs, Racing


Offline BSA_54A10

  • Wise & Enlightened
  • *
  • Join Date: May 2008
  • Posts: 2168
  • Karma: 34
    • BSA National
Re: spring n' ball
« Reply #3 on: 11.10. 2010 09:40 »
Hylomar from a spray can,
Wipe off the over spray with a rag damped with thinners or acetone
Bike Beesa