MGB: Rocker Pedestal ???

Oct 30, 2009 08:16:35
sarasmgb

When I took the head to the machine shop (1965 18GB ) , the pedestal was installed. when I picked it up, it was not. I'm seeing in the parts catalog that there is supposed to be 2 shims under the 2 center rocker pedestals. Is this correct. If so, I'll have to get some. thanks

Oct 30, 2009 08:27:03
Ralph 7h

Yes, youare right. There are shims under no. 2 and 3 pedestrials. I think they were ment to give the rocker shaft some kind of preload on this engines. The OEM part no. was 12H3960.

Oct 30, 2009 15:10:24
EW Chapman

X2 on what Ralph said. I just went through this procedure as I discovered no shims installed when I took mine apart this summer. There is some debate as to whether or not they actually do anything, but for the marginal cost or effort involved, I don't see where you wouldn't want to re-install them.

Oct 30, 2009 15:14:25
sarasmgb

thanks for the advice guys. maybe mine were not installed either. I'll be putting them back during assembly.

Oct 30, 2009 15:46:28
RAY 67 TOURER

The factory had a problem with the rocker shaft "walking" left and right. Their fix was to install shims under #2 an #3 pedestal to apply a slight load to prevent this. It seems to have worked. RAY

Oct 30, 2009 16:16:34
supergrade

I seem to recall reading somewhere that the shims were only installed after a certain engine number, but that the shims were to be retrofitted to all engines when redoing the head, for the above reasons.

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