The pump is attached to the rocker arm, and therefore easily accessible for repairs.
An attendant switched on the warning light and rocker arm that warned people outside of the stage not to barge in.
Disconnect the valve rod from rocker arm and block valve stem so it cannot blow out of the gland or let valve work back.
See if rocker arm tappets have a .020′′ clearance from valve stem when valve is seated.
When the exhaust valve is operated by the tappet rod and rocker arm the intake valve is also carried down with it.
rocker arm supports are steel studs with enlarged heads to take a double row ball bearing.
The rocker arm bearings are adequately lubricated by a compression grease cup.
A small non-revolving shaft was located directly under the rocker arm rollers that actuated the exhaust valves.
The valves are operated through a push rod and rocker arm construction, which is 7⁄16′′ and exceedingly light.
In case a rocker arm is used, both arms point in the same direction like the letter U.