HRC 50-55 Hardness Rocker Arm Shaft with Anti-corrosion Coating and Precision-drilled Oil Passages for Mitsubishi 4D31 4D34 Engine

Rocker Arm Shaft ME011274 For Mitsubishi 4D31 4D34 Engine ME-011274 Mitsubishi Auto Parts

The Rocker Arm Shaft (OEM Number: ME011274) is a premium-quality, direct replacement valvetrain component designed for Mitsubishi 4D31 and 4D34 diesel engines, commonly used in Mitsubishi Fuso Canter, buses, and industrial equipment.

• OE Quality: Manufactured to Mitsubishi dimensional and material specifications for perfect fit and reliable valve actuation
• Precision Ground Shaft: Smooth, hardened surface reduces wear on rocker arm bushings
• Induction-Hardened: HRC 50-55 surface hardness provides excellent wear resistance; tough core prevents breakage
• Integrated Oil Passages: Ensures proper lubrication to all rocker arm pivot points
• Corrosion Protected: Coated to resist rust
• Restores Valvetrain Performance: Eliminates tapping noise, uneven valve lift, and oil pressure loss
• Direct Replacement: Matches OE length, diameter, and mounting hole spacing
• Cost-Effective: Affordable alternative to genuine Mitsubishi shafts

This rocker arm shaft is specifically designed for Mitsubishi 4D31 and 4D34 engines.

• Mitsubishi Fuso Canter (light/medium trucks)
• Mitsubishi Rosa (buses)
• Mitsubishi FK/FM series (trucks)

Installation steps (overview):

1. Remove valve cover and rocker arm assembly
2. Remove the old rocker arm shaft from the pedestals
3. Clean the cylinder head pedestal bores and the new shaft
4. Lubricate the new shaft with engine assembly lube
5. Slide the new shaft through the pedestals and rocker arms in correct orientation
6. Install retaining bolts (if any) and torque to specification
7. Adjust valve lash to OE specification (typically 0.25-0.35mm cold)
8. Install new valve cover gasket and reassemble
9. Start engine and check for abnormal noise
10. Re-check valve lash after warm-up if required

• Material Verification: Steel alloy composition and hardness tested
• Dimensional Inspection: Length, diameter, oil hole positions, and straightness verified
• Hardness Testing: Surface hardness (HRC 50-55) confirmed
• Oil Flow Test: Sample shaft tested for unrestricted oil passage
• Visual Inspection: 100% checked for scratches, burrs, or heat treatment defects
• Packaged Safely: Wrapped in oiled paper, sealed in plastic bag, boxed with foam

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea