The info I read was that the shims put a little bit of a "hump" in
the center of the rocker shaft. This keeps it from rotating under load.
This is desirable because there are oil holes in the shaft that must
remain in the proper alignment for valve train oiling.
If some engines that lately have been torn down lack the shims, it's
the fault of the mechanics who last reassembled them. The engine in my
B has the shims.
CR
'69 B
Bob Howard wrote:
> Some time ago there was a discussion about the shims (moss #460-255)
> fitted under the center rocker pedestals of engines from 18GB on.
> Can someone direct me to the archive for this, or tell what they are
> for?
> WIthin the last month our club members have taken apart six 18V
> engines and have not found a single one of these shims.
> Bob
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