Rocker Arm Shaft 8-97036197-0 8-94152346-0 For ISUZU NKR55 4JB1 Engine 8970361970 8941523460

The Rocker Arm Shaft (OEM Numbers: 8-97036197-0 / 8-94152346-0 / 8970361970 / 8941523460) is a premium-quality, direct replacement engine valvetrain component designed specifically for ISUZU NKR55 series light-duty trucks equipped with 4JB1 diesel engines. This precision-ground shaft serves as the mounting and pivot point for the rocker arms, which transmit motion from the camshaft and pushrods to open and close the engine's intake and exhaust valves.

• OE Quality: Manufactured to strict ISUZU dimensional and material specifications for perfect fit and function
• Induction-Hardened: Hardened bearing surfaces provide exceptional wear resistance and long service life
• Precision Ground: Exact diameter and surface finish ensure proper rocker arm fit and smooth operation
• Integrated Oil Passages: Precision-drilled oil holes deliver lubrication to all rocker arm bushings
• Reduces Valve Train Noise: Smooth, unworn shaft eliminates clicking and tapping from loose or worn rockers
• Restores Valve Timing Accuracy: Proper shaft condition ensures consistent valve actuation
• Direct Replacement: Matches OE shaft dimensions and mounting configuration
• Essential for Overhaul: Critical component to replace during top-end engine rebuilds

This rocker arm shaft is specifically designed for ISUZU light-duty trucks and commercial vehicles. Common applications include:

• ISUZU NKR55 (Light-Duty Trucks)
• ISUZU 4JB1 Engine Specifications:
  • 4-Cylinder, Inline Diesel
  • Displacement: 2.8L
  • Valvetrain: OHV
  • Application: Light-duty trucks and commercial vehicles
• Also compatible with various ISUZU models using the 4JB1 engine with the same rocker shaft configuration

Professional mechanic or engine builder installation recommended:

1. Remove the valve cover - Unbolt and remove the valve cover to access the rocker assembly
2. Loosen rocker arm adjusting screws - Back off all valve lash adjusters to release pressure on the rocker arms
3. Remove the rocker shaft assembly - Unbolt the rocker shaft brackets and lift the complete assembly
4. Disassemble rocker arms - Remove rocker arms, springs, and brackets from the old shaft in correct order
5. Clean all components - Clean rocker arms and brackets; remove old oil and debris
6. Inspect rocker arms and bushings - Check for wear, scoring, or damage; replace if necessary
7. Lubricate new shaft - Apply clean engine oil or assembly lube to the new shaft surface
8. Assemble rocker arms on new shaft - Install rocker arms, springs, and brackets in the correct order and orientation
9. Install shaft assembly - Position the assembled rocker shaft on the cylinder head; align mounting brackets
10. Torque bracket bolts - Tighten mounting bolts to manufacturer torque specifications in the correct sequence
11. Adjust valve clearances - Set valve lash (clearance) per manufacturer specifications using a feeler gauge
12. Reinstall the valve cover - Install a new gasket and reinstall the valve cover with proper torque
13. Start and test - Start the engine; listen for abnormal valvetrain noise; recheck clearances if necessary

• Material Verification: Confirms alloy steel composition meets ISUZU strength and wear resistance specifications
• Hardness Testing: Induction-hardened bearing surfaces tested to ensure proper hardness
• Dimensional Inspection: Shaft diameter, length, and oil hole positioning verified within OEM tolerances
• Surface Finish Inspection: Bearing surfaces checked for proper smoothness and finish
• Visual Inspection: 100% checked for machining defects, cracks, or surface imperfections
• Packaged Safely: Protected with rust inhibitor and packaged to prevent damage during transit

• 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