Rocker Arm and Shaft Inspection

Remove the rocker arm assembly (see ROCKER ARM ASSEMBLY REMOVAL ).
Disassemble the rocker arm assembly (see ROCKER ARM AND SHAFT DISASSEMBLY/REASSEMBLY ).
Measure the diameter of the shaft at the first rocker location.

Fig 1: Measuring Diameter Of Shaft At First Rocker Location
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Zero the gauge (A) to the shaft diameter.

Fig 2: Setting Gauge To Zero At Shaft Diameter
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the inside diameter of the rocker arm, and check it for an out-of-round condition.
NO. 1, No. 2, No. 3, and No. 4 CYLINDERS

Intake Rocker Arm-to-Shaft Clearance

Standard (New): 0.015-0.046 mm (0.00059-0.00181 in)

Service Limit: 0.046 mm (0.00181 in)

NO. 1, No. 2, No. 3, and No. 4 CYLINDERS

Exhaust Rocker Arm-to-Shaft Clearance

Standard (New): 0.015-0.046 mm (0.00059-0.00181 in)

Service Limit: 0.046 mm (0.00181 in)

No. 5 and No. 6 CYLINDERS

Intake Rocker Arm-to-Shaft Clearance

Standard (New): 0.018-0.056 mm (0.00071-0.00220 in)

Service Limit: 0.056 mm (0.00220 in)

No. 5 and No. 6 CYLINDERS

Exhaust Rocker Arm-to-Shaft Clearance

Standard (New): 0.018-0.047 mm (0.00071-0.00185 in)

Service Limit: 0.047 mm (0.00185 in)

Fig 3: Measuring Inside Diameter Of Rocker Arm
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Repeat for all rockers and both shafts. If the clearance is over the limit, replace the rocker shaft and all over-tolerance rocker arms. If any variable cylinder management rocker arm needs replacement, replace all rocker arms in that set (primary and secondary).
Variable Cylinder Management Rocker Arms
Inspect the rocker arm pistons (A). Slide them into the rocker arms. If they do not move smoothly, replace the rocker arm set.
NOTE:
- Apply new engine oil to the rocker arm pistons when reassembling.
- When removing the rocker arm pistons from the intake primary rocker arm (B) and the exhaust secondary rocker arms (C), carefully apply air pressure to the oil passage of the rocker arm.
INTAKE

Fig 4: Identifying Primary Rocker Arm, Secondary Rocker Arm And Rocker Arm Piston (Intake)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

EXHAUST

Fig 5: Identifying Primary Rocker Arm, Secondary Rocker Arm And Rocker Arm Piston (Front)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Reassemble the rocker arm assembly (see ROCKER ARM AND SHAFT DISASSEMBLY/REASSEMBLY ).
Install the rocker arm assembly (see CAMSHAFT, ROCKER ARM ASSEMBLY, CAMSHAFT SEAL, AND PULLEY INSTALLATION ).