Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSHONDA2009S2000 BASEREPAIR AND DIAGNOSISENGINE MECHANICALMECHANICALCYLINDER HEADROCKER ARM AND SHAFT INSPECTION

2009 Honda S2000 Base

Rocker Arm and Shaft Inspection

2009 Honda S2000 BaseSECTION Rocker Arm and Shaft Inspection

Remove the rocker arm assembly (see CYLINDER HEAD INSPECTION FOR WARPAGE ).
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 Rocker Shaft At First Rocker Location
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Zero the gauge (A) to the shaft diameter.

Fig 2: Identifying Gauge In Zero Position
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the inside diameter of the rocker arm, and check it for an out-of-round condition.
Rocker Arm-to-Shaft Clearance:

Standard (New): 0.021-0.041 mm (0.0008-0.0016 in.)

Service Limit: 0.07 mm (0.003 in.)

Fig 3: Measuring Inside Diameter Of Rocker Arm
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Repeat for all rocker arms and both shafts. If the clearance is over the limit, replace the rocker shaft and all over-tolerance rocker arms. If any rocker arm needs replacement, replace all three rocker arms in that set (primary, mid, and secondary).
Inspect the rocker arm synchronizing pistons (A). Push each piston manually. If it does not move smoothly, replace the rocker arm assembly.
NOTE:
- When reassembling the primary rocker arm (B), carefully apply air pressure to its oil passage.
- Apply new engine oil to the pistons when reassembling.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.