[Healeys] shim value springs?

[Bob Spidell]

John,

I believe the test is to compress the spring to a specific pressure value, then measure the height of the spring.  If 
it's not 'tall' enough compressed then shims are needed.  There is a special rig to do this--which looks kinda like an 
arbor press with a pressure gauge--or may be done other ways:

http://www.cpgnation.com/forum/comp-cams-how-valve-spring-tech-2047.htm

http://www.hastingsmfg.com/ServiceTips/valve_spring_inserts.htm

You can only use so much shim before the springs will bind.


Bob



On 10/27/2011 10:37 PM, john spaur wrote:
> I was looking for an oil pump and noticed Denis Welch had valve spring shims for sale. By coincidence I am rebuilding 
> the engine head and noticed that it had valve spring shims which I must have reinstalled when I put NOS valve springs 
> in the engine several years ago because the ones that were replaced were out of spec.
>
> How does one go about determining whether shims are needed (or wanted for some reason)? How do you measure for them or 
> what is the selection criteria?
>
> Just curious.
>
> John Spaur
> '62 BT7
> _______________________________________________
>


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Bob Spidell           San Jose, CA            bspidell at comcast.net

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