Rolls-Royce 20/25 - rocker shaft removal


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engine stand



Engine safely installed in the rotating stand.  As will be seen later this does cause a few problems.

release tappets



The first job is to remove the rocker shaft.  The tappets for all open valves are completely loosened to relieve the pressure from the rocker shaft.  Failure to do this could lead to a bent or broken shaft.

release shaft



The two outer pedestals each have a 2BA stud and nut fastening through the base flange.  The nuts and washers must be removed as the first operation.

The rocker shaft pedestal nuts are slackened a small amount each, in a repeated cycle, to avoid damage to the shaft.  Even when the tappets are fully slackened off the open valves will still exert substantial pressure.



The complete shaft with rockers and spacer.  The pedestals are stamped #1 to #7; front to rear.

domed washer


The pedestal washers are domed on their under-sides to ensure accurate location.  The nuts are half-height and held in place by a spring washer

shaft off



Shaft removed , all fasteners replaced in their original positions for safe storage.  The push rods must be removed.




The push rods wear to match their own rocker arm and cam follower so it is imperative that they are replaced in their proper positions.  The rods are often engraved with their position number.  This simple rack ensures that there is a place for everything and that everything is in its place.


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