Rocker Arm Assembly: Service and Repair

Hydraulic Lash Adjusters
Removal
1. Rocker arm and rocker arm shaft assembly
Disassembly Note:






(a) Loosen the bolts in two or three steps in the order shown.
(b) Identify the rocker arm and rocker arm shaft assembly parts so that they can be reinstalled in the same locations from which they were removed.
(c) Remove the rocker arm and rocker arm shaft assembly together with the bolts.

Caution: Do not mix up the parts of the rocker arm and shaft assembly.

Inspection:
Check for wear and damage to the contact surfaces of the rocker arm shaft and the rocker arm. Check the oil clearance between the rocker arm and rocker arm shaft. Replace if necessary.






(d) Measure the rocker arm inner diameter.
Diameter: 19.000-19.033 mm (0.7481-0.7493 in }






(e) Measure the rocker arm shaft diameter.
Diameter: 18.959-18.980 mm (0.7465-0.7472 in }
(f) Subtract the rocker arm shaft diameter from the inner diameter.

Oil clearance: 0.020-0.074 mm (0.0008-0.0029 in }
Maximum: 0.10 mm (0.004 in }






Hydraulic Lash Adjuster (HLA)
Caution: Oil leakage will occur if the 0-ring is damaged.
Remove the HLA by hand. If this is difficult, remove it with pliers.

Assembly

Caution: Do not to damage the 0-ring when installing the HLA.

Rocker Arm and Shaft Assembly
1. Apply engine oil to the rocker arm shafts and rocker arm bearing surface.






2. Assemble the rocker arm and shaft assembly as shown in the figure.

Note: The intake side shaft has twice as many oil holes as the exhaust side shaft.






1. Pour engine oil into the oil reservoir in the rocker arm.
2. Apply engine oil to the HLA.
3. Carefully install the HLA into the rocker arm.






3. Install the rocker arm and shaft assembly.
4. Tighten the bolts in two or three steps in the order shown in the figure.
Tightening torque: 19-25 N.m { 1.9-2.6 kgf.m, 14-18 ft.lbf }

Caution: Be careful that the rocker arm shaft spring does not get caught between the shaft and mounting boss during installation.