Valve Rocker Shaft Assembly for Isuzu 700P 4HK1 Engine - Induction-Hardened with Precision-Drilled Oil Passages & OEM Standard Fitment

The Valve Rocker Shaft Assembly (OEM Numbers: 8-97174588-0 / 8971745880) is a premium-quality, direct replacement valvetrain component designed for Isuzu 700P medium-duty trucks equipped with the 4HK1 diesel engine.

Valve rocker shaft assembly supports and aligns the rocker arms, transferring motion from the camshaft or pushrods to the valves. Ensures precise valve timing and quiet valvetrain operation for Isuzu 4HK1 diesel engines.

• OE Quality: Manufactured to Isuzu dimensional and material specifications for perfect fit and reliable valve actuation
• Precision Ground Shaft: Smooth, hardened surface reduces wear on rocker arm bushings
• Integrated Oil Passages: Ensures consistent lubrication to all rocker arm pivot points
• Complete Assembly: Includes shaft, rocker arms, springs, and retainers - ready to install
• Heat-Treated: Induction-hardening provides wear resistance (HRC 50-55) while maintaining core toughness
• Restores Valvetrain Performance: Eliminates tapping noise, uneven valve lift, and oil pressure loss
• Direct Replacement: Matches OE bore spacing, mounting holes, and oil feed alignment
• Cost-Effective: Affordable alternative to genuine OEM assemblies

This valve rocker shaft assembly is specifically designed for Isuzu 700P trucks with 4HK1 engine.

• ISUZU 700P (medium-duty truck, 4HK1 engine)
• May also fit other Isuzu models using the 4HK1 engine (NPR, NQR, FRR) - verify

• 4-Cylinder, Inline Diesel, DOHC, Common Rail
• Displacement: 5.2L (5193cc)

Installation steps (overview for 4HK1 OHV engine):

1. Remove valve cover and any related components
2. Remove old rocker arm shaft assembly - unbolt the rocker shaft pedestal bolts in a sequence (loosen gradually). Lift the shaft with rocker arms attached
3. Inspect pushrods and lifters - replace if worn
4. Clean cylinder head mating surface - remove old gasket material
5. Lubricate new rocker arm shaft - apply engine assembly lube to the shaft and rocker arm bushings
6. Install new assembly - position on the cylinder head with pushrods aligned in the rocker arm sockets. Torque pedestal bolts to specification (typically 35-45 Nm for 4HK1) in sequence
7. Adjust valve lash - set intake and exhaust clearances to OE specification (typically 0.25-0.35mm cold for 4HK1)
8. Install new valve cover gasket - torque cover bolts
9. Start engine - check for abnormal noise and oil leaks
10. Re-check valve lash after warm-up - if required

• Material Verification: Shaft alloy composition and rocker arm material tested
• Dimensional Inspection: Shaft length, diameter, rocker arm ratio, and oil hole positions verified against OE blueprints
• Straightness Test: Shaft runout measured (≤ 0.05mm)
• Hardness Testing: Shaft surface hardness (HRC 50-55) and rocker arm pad hardness checked
• Oil Flow Test: Sample shaft tested for unrestricted oil passage
• Visual Inspection: 100% checked for scratches, burrs, or heat treatment discoloration
• Packaged Safely: Assembly wrapped in oiled paper, 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