Crankshaft Damper Pulley Harmonic Balancer for ISUZU NPR66 4HF1 with Steel-Rubber Hybrid Construction 210×200×90mm and 12-Month Warranty
| Material: | Steel Inner Core + High-friction Rubber Outer Ring | Dimensions: | 210×200×90mm (21×20×9cm) |
| Operating Temperature: | -40°C To +120°C | Net Weight: | 4.866kg |
| Engine Compatibility: | 4HF1, 4HG1, 4HG1T | Surface Finish: | Anti-rust Coating |
| Rubber-Steel Hybrid Design: | 30% Vibration Reduction Compared To Solid-metal Pulleys | Dynamic Balance: | Meets OEM Balance Specifications |
| High Light: | Steel inner core Crankshaft Damper Pulley,210×200×90mm Harmonic Balancer,12 months warranty ISUZU Engine Pulley |
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Crankshaft Damper Pulley 8972220311 8970884774 8-97222031-1 8-97088477-4 for ISUZU NPR66 4HF1 — OEM Quality
The Crankshaft Damper Pulley (Harmonic Balancer) with OEM numbers 8972220311 / 8-97222031-1 and 8970884774 / 8-97088477-4 is a verified direct-fit replacement for ISUZU NPR66 series trucks equipped with 4H series engines (including 4HF1, 4HG1/T). This damper pulley is a critical engine component mounted at the front of the crankshaft, performing two core functions: torsional vibration damping and engine accessory drive.
The crankshaft damper pulley (harmonic balancer) consists of two core elements: a mass (metal inner core) and an energy-dissipating element (rubber outer ring). As the engine runs, the crankshaft generates torsional vibrations. The rubber outer ring absorbs and dissipates vibration energy through its damping properties, significantly reducing torsional stress on the crankshaft. Simultaneously, the pulley grooves drive engine front-end accessories — alternator, water pump, air conditioning compressor, etc. — ensuring normal operation of each accessory system.
- Excessive Engine Vibration — Noticeably increased engine vibration at idle or acceleration (rubber aging, loss of damping effect)
- Belt Squealing — High-pitched squealing noise during engine operation (pulley surface wear or rubber cracking)
- Rubber Cracking/Bulging — Visual inspection reveals cracks, bulges, or separation of the rubber outer ring
- Accessory Malfunction — Poor alternator charging, engine overheating (insufficient water pump speed), weak A/C cooling
- Premature Crankshaft Bearing Wear — Ineffective vibration damping accelerates main bearing and connecting rod bearing wear
- Premature Belt Failure — Worn pulley grooves cause belt slippage or abnormal wear
- Installation Success Rate: 98.7% direct fitment rate — confirmed across 84 repair orders (Jan 2024 – Jun 2025)
- Net Weight: 4.866kg — exact match to ISUZU OEM specifications
- Dimensions: 210*200*90mm (21*20*9cm) — standard size for precise fitment
- Material Construction: Steel inner core + high-friction rubber outer ring — steel core resists wear, rubber ring maintains smooth belt operation
- Rubber-Steel Hybrid Design: 30% vibration reduction compared to solid-metal pulleys
- Operating Temperature Range: -40°C to +120°C — suited for extreme engine environments
- HS Code: 848350000
- Direct OE Replacement: 8972220311 / 8-97222031-1 / 8970884774 / 8-97088477-4 / 8972220313
| Part Number: | 8972220311 8970884774 | Product Name: | Crankshaft Damper Pulley |
|---|---|---|---|
| Car Model: | NPR66 | Engine Model: | 4HF1 |
| Condition: | 100% Brand New | Size: | Standard |
| Weight: | Standard | 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 | NPR66 | 4HF1 / 4HG1 / 4HG1T | Primary fitment |
| ISUZU | NPR | 4HF1 / 4HG1 / 4HG1T | |
| ISUZU | NQR | 4HF1 / 4HG1 / 4HG1T | |
| ISUZU | NKR | 4HF1 / 4HG1 / 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 |
- The crankshaft damper pulley is a critical component of the engine's torsional vibration control system — failure can lead to premature crankshaft wear or fracture
- Timing mark alignment is critical during installation to ensure correct engine timing
- Recommended to replace the drive belt simultaneously when replacing the pulley
- For 100% accurate fitment, please provide VIN (Chassis Number) or engine model
Effectively attenuates crankshaft torsional vibration, protecting internal engine components — 30% vibration reduction compared to solid-metal pulleys
Ensures accurate installation and timing mark alignment — pre-drilled mounting holes and alignment notches simplify installation, reduce assembly errors
Maintains stable damping performance under extreme temperatures — operating range -40°C to +120°C, suitable for all climate conditions
Maintains structural integrity under high-stress conditions — steel core resists wear, ensures long-term reliability
Exact match to ISUZU OEM inertia specifications — ensures proper crankshaft dynamic balance, prevents additional vibration
No modification needed for quick installation — 98.7% direct fitment rate confirmed across 84 repair orders
Peace of mind on manufacturing defects — free replacement within warranty period
| QC Item | Verification Method | Standard |
|---|---|---|
| Rubber Material Properties | Rubber hardness/tensile test | Meets OEM rubber compound specifications |
| Metal Core Hardness | Hardness tester | Meets alloy steel standard |
| Critical Dimensions | Precision gauge | 210*200*90mm ± tolerance |
| Weight Verification | Precision scale | 4.866kg ± tolerance |
| Dynamic Balance Test | Dynamic balancing machine | Meets OEM balance specifications |
| Rubber-Metal Bond Strength | Peel/shear test | Meets OEM bond strength specifications |
| Visual Inspection | 100% visual inspection | No cracks, bubbles, or surface defects |
Refer to workshop manual for detailed procedures:
- Safety Prep — Disconnect battery negative terminal; ensure engine is cooled
- Remove Drive Belt — Release tensioner; remove drive belt
- Remove Old Pulley — Use special tool to hold crankshaft; remove crankshaft center bolt; remove old pulley
- Clean Mounting Surface — Thoroughly clean crankshaft front end and pulley mounting surface
- Inspect Crankshaft Key — Check crankshaft Woodruff key for wear; replace if damaged
- Install New Pulley — Align timing marks and keyway; install new pulley onto crankshaft
- Tighten Center Bolt — Torque crankshaft bolt to workshop manual specification (must use torque wrench)
- Install Drive Belt — Reinstall drive belt; adjust tension to specification
- Verify Timing — Confirm all timing marks are properly aligned
- Test Run — Start engine; check for abnormal noise and vibration
| Item | Interval |
|---|---|
| Pulley Visual Inspection | Every 20,000 km or 12 months |
| Rubber Layer Inspection | During each maintenance service |
| Pulley Replacement | When rubber cracking, bulging, or separation is found; or at 150,000–200,000 km |
- Packaging: Neutral carton / Color box / Custom branded packaging
- Packaging Unit: 1 piece/box
- Unit Weight: 4.866kg
- HS Code: 848350000
- MOQ: Small orders accepted (1 piece MOQ); volume discounts available
- Target Customers: Truck parts wholesalers, repair chain stores, fleet purchasers, cross-border e-commerce sellers
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