V8, shims beside each rocker

mtb_tuli

mtb_tuli

Active Member
have read about an MGB V8 overhauling. The guy used used small steel shims (0,02 mm) on the rocker shaft, lh and rh to each rocker in order to have a better contact (or, let´s say reduced friction) between springs and rockers or rocker pedestals and rockers. The idea was not to modify valve train for higher output but to improve design a little bit. Any experience with this method ?
 
Sparky has them fitted by the previous owner, but as Cafpete says, they were put there to set the preload on the followers.



If you have skimmed your heads or fitted a high lift camshaft, the valve train can run slightly out, and indeed fitting the shims to pre-load the followers correctly can line it all back up again, therefore putting the contact between the rocker and valve back to where it should be. (I know what I mean :) ) If you have a standard engine and all is as it was designed to be, putting shims in will not improve anything.

Richard
 
Thanks, but sorry, that´s not what I meant (preload shims I already have bought, my heads are skimmed).
The "shims" I mean (can´t find the correct translation, in German it´s Pass-Scheibe :confused:) will fit onto the rocker shafts, see photo...
kipphebelwellen_shims.jpg
It´s the photo from an MGB GT blog.
 
0,02 mm ?? Forget, correct is 0,2 mm.
The shims are 22 x 30 mm (you can get them with 0,1 - 1,5 mm).
 
I suppose thin shims or washers (as long as they're hardened) might stop the springs from slowly wearing the sides of the aluminium rockers and also maybe reduce the rockers or pedestals wearing where they touch?
I don't know if they'd reduce friction by any measureable amount though.
 
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