Sounds like the tower is pushing the rocker against the washer on
the rear of the shaft and locking it up when you tighten the screw. I
have a spare rocker assembly, so I took a look at it. Do you have a
spring between the rear rocker and the washer on the end? It's supposed
to be cotter pin, washer, spring, rocker and tower, going from rear to
front.
Cheers,
CR
bilking@comcast.net wrote:
> The grub screw is located in the rear rocker shaft support pedestal and
> prevents the shaft from rotating. It also aligns the oil passage hole
> through the pedestal to the shaft. If tightened fully it also locks the
> front/rear shaft movement due to it's tapered end. When I tighten it fully
> the rear rocker arm fully compresses the spring and the arm does not rotate
> freely on the shaft. The engine is an 18GB.
>
> Sorry for the lack of information.
>
> Bill
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