[Fot] valve shims and springs

[tr4racing at googlemail.com]

Hi Dave,

 

these shims need to be hardened steel.

On my TR4 I use no shims. The cast iron is a good surface for spring rotation.

On the TR8 with the aluminum head there are shims. The first set was squeezed out after a few races, they were too soft.





The second set of shims was nitrate hardened and they last.

 

Cheers

Chris

 

 

Von: Fot <fot-bounces at autox.team.net> Im Auftrag von DAVE HOGYE via Fot
Gesendet: Samstag, 18. April 2020 17:33
An: Friends of Triumph <Fot at autox.team.net>
Betreff: [Fot] valve shims and springs

 

Hello Friends, 

I've removed and disassembled my TR3 engine after 7 years, 19 race events and about 5500 miles since it's completion.  

The crank and cam look excellent as do the bearings, both mains and rods.   

One thing I found was that some of the valve spring shims were disintegrating.  There are two different types of shims, one golden/yellow and one plain silver. The problem is that the silver ones are heavily worn from the springs tearing them up.  The golden yellow shims look as installed, with no visual wear and they don't seem to have been rotating.  It obvious the springs over the silver shims were rotating and causing the heavy wear.  Perhaps these shims are too soft. 

Can someone enlighten me on this?   

In the garage on lockdown, 

Dave H. 

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