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.
Rocker Arm and Shaft Disassembly, Reassembly, and Inspection (K20C2): Inspection
- Rocker Arm and Rocker Shaft - Inspect
1. Measure the diameter of the rocker shaft at the first rocker location. 2. Zero the gauge (A) to the rocker shaft diameter. 3. Measure the inside diameter of the rocker arm, and check it for an out-of-round condition.
Rocker Arm-to-Shaft Clearance Standard (New): 0.018-0.059 mm (0.00071-0.00232 in) Service Limit: 0.080 mm (0.00315 in) 4. Repeat for all rocker arms and both shafts. If the clearance is beyond the service limit, replace the rocker shaft and all out of service limit rocker arms. If any VTEC rocker arm needs replacement, replace the rocker arms (primary, mid, and secondary), as a set.
- VTEC Rocker Arm - Inspect
VTEC Rocker Arms 1. Inspect the rocker arm pistons (A). Push on each piston manually. If it does not move smoothly, replace the rocker arm set.
NOTE: Apply new engine oil to the rocker arm pistons when reassembling.
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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.