Follow these steps to clean the rocker arm assembly parts.
Immerse all components in a suitable solvent.
To avoid injury from flying debris when using compressed air, wear adequate eye protection (face shield or safety goggles) and do not exceed 40 psi (276 kPa) air pressure.
Remove and dry using filtered compressed air.
Inspection of Rocker Arm Assembly
Follow these steps to inspect the rocker arm assembly.
Visually inspect rocker arm shaft and bushings for scoring or signs of excessive wear. If visibly damaged, replace shaft and rocker arm, as required.
Valve levers have an oil spreader groove on the bushing. The oil spreader groove, 0.028 - 0.046 mm (0.011 - 0.018 in.) depth, is located opposite the oil hole and aids in oil dispersion over the entire bushing surface. See Figure
1. Part Number Location
2. Oil Spreader Groove
Oil Spreader Groove
Valve levers (rocker arms) have an oil spreader groove on the bushing. The oil spreader groove, 0.011-0.018 in. (0.028-0.046 mm) depth, is located opposite the oil hole and aids in oil dispersion over the entire bushing surface.
Measure valve lever bushings using a telescoping gage and outside micrometer. See Figure
. Measure bushings at two (2) locations, 90 degrees apart. Record the readings
Measure Valve Lever Bushings
Measure the valve lever shaft with a micrometer. If more than 0.13 mm (0.005 in.) difference is found between the valve lever bushing I.D. and the valve lever shaft O.D., replace the valve lever and/or shaft, whichever part is worn.
If valve levers are within specifications, they may be reused. Prior to assembly, assure oil hole in valve levers and bushings is open by running a wire through the oil hole. Remove any blockage before assembly.
Inspect all orifices for blockage. Run a wire through each to assure they are open. See Figure
Checking Rocker Arm Components
Inspect valve lever (rocker arm) shaft springs as follows:
Visually inspect for rust, pitting and cracks. Replace as required.
The rocker arm shaft is marked at the top. This marking should face up at all times.
Cup plugs at each end of the shaft are replaceable. They should not be removed unless damaged or leaking. If replacement is required, pry damaged plug out and press in a new cup plug. See Figure
Ensure the brackets are lined up over the shaft bolt grooves. See Figure
1. Cylinder Head
4. Mounting Bolt
5. Shaft Hole Position
3. Rocker Arm Shaft
End View of Rocker Arm Shaft
When all components of the valve lever (rocker arm) shaft have been installed in the correct order, attach a retaining ring to secure the component to the shaft. See Figure
Valve Lever Assembly
Follow these steps to install the valve lever assembly.