Rocker Arm Assembly
Rocker Arm Removal1. Remove the cam chain.
2. Loosen the rocker arm adjusting screws (A).
3. Remove the camshaft holder bolts. To prevent damaging the camshafts, unscrew the bolts two turns at a time, in a crisscross pattern.
CAMSHAFT HOLDER BOLTS LOOSENING SEQUENCE
4. Remove the cam chain guide B. camshaft holders, and camshafts.
5. Insert the bolts (A) into the rocker shaft holder, then remove the rocker arm assembly (B).
Rocker Arms and Shafts Disassembly/Reassembly
NOTE:
^ Identify parts as they are removed to ensure reinstallation in original location.
^ Inspect the rocker shafts and rocker arms.
^ The rocker arms must be installed in the same positions if reused.
^ When removing or installing the rocker arm assembly, do not remove the camshaft holder bolts. The bolts will keep the holders, springs and rocker arms on the shaft.
^ Prior to reassembling, clean all the parts in solvent, dry them, and apply lubricant to any contact points.
^ Bundle the rocker arms with rubber bands to keep them together as a set.
K20A3 engine
K20A2 engine
Rocker Arms and Shafts Inspection
1. Remove the rocker arm assembly.
2. Measure the diameter of the shaft at the first rocker location.
3. Zero the gauge (A) to the shaft diameter.
4. Measure the inside diameter of the rocker arm, and check it for an out-of-round condition.
Rocker Arm-to-Shaft Clearance:
K20A3 engine:
Standard (New):
Intake: 0.025 - 0.052 mm (0.0010 - 0.0020 inch)
Exhaust: 0.018 - 0.056 mm (0.0007 - 0.0022 inch)
Service Limit: 0.08 mm (0.003 inch)
K20A2 engine:
Standard (New): 0.025 - 0.052 mm (0.0010 - 0.0020 inch)
Service Limit: 0.08 mm (0.03 inch)
5. Repeat for all rocker arms and both shafts. If the clearance is over the limit, replace the rocker shaft and all overtolerance rocker arms. If any VTEC rocker arm needs replacement, replace rocker arms (primary and secondary, or primary, mid and secondary) as a set.
6. Inspect the rocker arm pistons (A). Push each piston manually. If it does not move smoothly, replace the rocker arm set.
NOTE: Apply oil to the pistons when reassembling.
K20A3 engine
K20A2 engine