Rocker Shaft - Overhaul

Rocker Shaft - Overhaul

Service Repair No - 12.29.49

If both rocker shafts are to be removed, identify each assembly to ensure refitment to original cylinder head.

Disassembly





Left Side





Right Side

1. Release HT leads from rocker covers.





2. Remove 4 bolts securing rocker cover and remove cover.
3. Remove and discard rocker cover gaskets.





4. Progressively remove 4 bolts securing rocker shaft assembly to cylinder head, release rocker shaft from push rods and remove rocker shaft.
5. Ensure push rods remain located in tappets when rocker shaft is removed. Retain all components in their removed sequence for re-assembly.





6. Remove and discard split pin from one end of rocker shaft.
7. Collect plain and wave washers.
8. Remove the rocker arms, rocker pillars and springs.
9. Remove and discard remaining split pin and collect plain and wave washers.

Inspect

1. Clean all components.
2. Inspect rocker shaft and rocker arms for wear and scoring. Replace as required.
3. Replace weak or broken springs.
4. Lubricate moving parts with clean engine oil.

Reassembly

1. Reassemble rocker shafts, ensuring that components are returned to their original positions, secure plain washers with new split pins.
2. Ensure shaft identification groove is positioned at one o'clock, with push rod locations of rocker arms to the right. Oil feed restriction will result if rocker shafts are incorrectly assembled.
3. Position rocker shaft assembly to cylinder head ensuring push rods are engaged in rocker arms.
4. Fit rocker shaft bolts and progressively tighten to 40 Nm (30 ft. lbs.).
5. Clean mating faces of rocker covers and cylinder heads.
6. Fit new rocker cover gaskets, dry, position rocker cover, fit bolts and, working in a diagonal sequence tighten initially to 4 Nm (3 ft. lbs.) and finally to 8 Nm (6 ft. lbs.).
7. Secure HT leads to rocker cover,