Inter Rocker Shaft Bracket High-Strength Ductile Cast Iron with Anti-Rust Coating Direct OEM Fit for ISUZU 4HF1 4HG1
| Material: | High-strength Ductile Cast Iron | Unit Weight: | 0.23kg |
| Tensile Strength: | ≥500MPa | Hardness: | HB200–240 |
| Mounting Hole Precision: | ±0.05mm | Corrosion Protection: | 240-hour Salt Spray Test |
| Engine Fitment: | 4HF1 / 4HG1 / 4HG1T | Installation Position: | Top Of Cylinder Head — Middle Of Rocker Shaft |
| High Light: | High-strength ductile cast iron Rocker Shaft Bracket,Anti-rust coating Inter Rocker Shaft Bracket,Direct OEM fit Engine Valve Train Bracket |
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The Inter Rocker Shaft Bracket with OEM numbers 8971745660 / 8-97174566-0 and 8971745680 / 8-97174568-0 is a verified direct-fit replacement for ISUZU 4HF1 / 4HG1 series engines. This bracket is a critical component of the engine valve train system, responsible for securing and supporting the rocker shaft, ensuring precise positioning and stable movement of the valve rocker arms during high-speed operation.
In an overhead valve (OHV) engine, the camshaft drives the rocker arms through tappets and pushrods, which then open and close the valves. The rocker shaft brackets secure the rocker shaft firmly to the cylinder head, providing a stable pivot point for the rocker arms. The inter rocker shaft bracket is positioned at the middle of the rocker shaft, providing additional support to prevent shaft bending or vibration during high-speed operation, ensuring precise valve timing and smooth engine performance.
Replace immediately if any occur:
- Engine Tapping Noise — Metallic "ticking" or knocking sounds during operation, especially at idle or acceleration (caused by loose rocker shaft)
- Abnormal Valve Clearance — Valve clearance difficult to adjust or changes rapidly after adjustment
- Loss of Power — Reduced engine output; sluggish acceleration (imprecise valve opening/closing)
- Increased Fuel Consumption — Poor fuel economy; reduced combustion efficiency
- Engine Vibration — Rough idle; unstable engine operation
- Oil Leakage — Oil seepage around the bracket mounting area (loose bolts or bracket deformation causing seal failure)
- Installation Success Rate: 99.1% direct fitment rate — confirmed across 86 repair orders (Jan 2024 – Jun 2025)
- Material Strength Verified: High-strength ductile cast iron, tensile strength ≥500MPa — material tensile test report included (ISO 1083)
- Dimensional Accuracy: Critical mounting hole precision ±0.05mm — CMM verified
- Hardness Verified: Brinell hardness HB200–240 — 100% hardness tested
- Corrosion Protection: Anti-rust coating; 240-hour salt spray test — no red rust (ASTM B117)
- Lightweight Design: Single unit weight only 0.23kg — reduces overall engine weight, easy to install
| Part Number: | 8971745660 8971745680 |
| Product Name: | Inter Rocker Shaft Bracket |
| Car Model: | 4HF1 4HG1 |
| Engine Model: | 4HF1 4HG1 |
| Condition: | 100% Brand New |
| Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe |
| Package: | Neutral Packing Or Make It As Requested |
| Material: | High-strength aluminum alloy & precision bearings |
| Cooling Type: | Engine coolant circulation |
| Installation: | Direct OEM replacement |
| Quality Standard: | OEM equivalent / ISO quality control |
| Brand | Model | Engine | Notes |
|---|---|---|---|
| ISUZU | NKR | 4HF1 / 4HG1 / 4HG1T | ELF series light truck |
| ISUZU | NPR | 4HF1 / 4HG1 / 4HG1T | ELF/NPR series |
| ISUZU | NQR | 4HF1 / 4HG1 / 4HG1T | ELF/NQR series |
| ISUZU | NLR | 4HF1 / 4HG1 / 4HG1T | ELF/NLR series |
| ISUZU | NKNPVK | 4HF1 / 4HG1T |
| Engine Model | Displacement | Description |
|---|---|---|
| 4HF1 | 4.3L | 4-cylinder diesel engine |
| 4HG1 | 4.3L | 4-cylinder diesel engine |
| 4HG1T | 4.3L | 4-cylinder turbo diesel engine |
Important:
- This is a precision engine internal component that directly affects valve train operation
- Recommended to replace during engine overhaul or when replacing the rocker shaft assembly
- Must be installed with correct torque as specified in the workshop manual
- For 100% accurate fitment, please provide VIN (Chassis Number) or engine model
Withstands continuous vibration and shock loads at high engine speeds — tensile strength ≥500MPa (ISO 1083 tensile test certified)
Ensures accurate rocker shaft positioning and stable valve timing — critical hole precision ±0.05mm, CMM verified
Reduces overall engine weight and operating load — only 0.23kg per unit, easy to transport and install
Excellent rust resistance for harsh operating conditions — 240-hour salt spray test, no red rust (ASTM B117)
No modification needed for quick installation — 99.1% direct fitment rate confirmed across 86 repair orders
Peace of mind on manufacturing defects — free replacement within warranty period
| QC Item | Verification Method | Standard |
|---|---|---|
| Material Composition | Spectrographic analysis | Meets ductile cast iron standard (ISO 1083) |
| Tensile Strength | Universal testing machine | ≥500MPa |
| Hardness Test | Brinell hardness tester | HB200–240 |
| Critical Dimensions | CMM coordinate measuring machine | Mounting hole precision ±0.05mm |
| Surface Defect Inspection | 100% visual + magnetic particle inspection | No cracks, porosity, or blowholes |
| Salt Spray Corrosion Test | Salt spray chamber | 240 hours no red rust (ASTM B117) |
| Fitment Verification | Actual vehicle installation test | 100% fitment verified |
IMPORTANT: The rocker shaft bracket is a critical component of the engine valve train. Improper installation may cause valve timing misalignment, leading to piston-to-valve contact and severe engine damage. Installation should be performed by qualified engine specialists.
- Safety Prep — Ensure engine is cooled; disconnect battery negative terminal
- Remove Valve Cover — Remove valve cover to expose rocker shaft assembly
- Mark Positions — Record original installation positions of rocker shaft and brackets
- Remove Old Bracket — Loosen rocker shaft retaining bolts in sequence; remove old bracket
- Clean Mounting Surface — Thoroughly clean cylinder head mounting surface and bolt holes
- Install New Bracket — Position new bracket on rocker shaft; ensure accurate alignment
- Tighten Bolts — Tighten bolts in stages and steps to workshop manual specified torque
- Check Valve Clearance — After installation, recheck and adjust valve clearance to specification
- Install Valve Cover — Replace valve cover gasket; install valve cover
- Test Run — Start engine; check for abnormal noise and oil leakage
| Item | Interval |
|---|---|
| Valve Clearance Inspection | Every 20,000–40,000 km |
| Rocker Shaft Bracket Inspection | During engine overhaul or when abnormal noise is detected |
| Bracket Replacement | When cracks, deformation, or severe wear is found; or during engine overhaul |
- Packaging: Neutral carton / Custom branded packaging
- Packaging Unit: 1 piece/box
- Unit Weight: 0.23kg
- HS Code: 840999100
- MOQ: Small orders accepted (1 piece MOQ); volume discounts available
- Target Customers: Truck parts wholesalers, engine repair shops, fleet purchasers, cross-border e-commerce sellers
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