High-strength cast iron Flywheel with 142-tooth ring gear and dynamically balanced for Isuzu NPR NKR 4HG1 4HF1 Truck
Function: A high-strength flywheel that stores rotational energy, smooths engine power pulses, and provides a friction surface for the clutch disc to engage. It is a critical component for power delivery, drivability, and clutch life.
The Engine Flywheel (OEM Number: 8-97115782-0 / 8971157820) is a premium-quality, direct replacement engine component designed specifically for a wide range of ISUZU N-series medium-duty trucks (NKR, NPR, NQR, NPS), as well as F-series and C-series chassis, equipped with the highly regarded 4HF1 4.3L and 4HG1 4.6L diesel engines. This component is also directly compatible with the 4HE1T and 4HG1T turbocharged variants.
| Part Number: | 8971157820 8-97115782-0 | Product Name: | Flywheel |
| Car Model: | Isuzu NPR NKR | Engine Model: | Isuzu 4HG1 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 forged steel | Installation: | Direct OEM replacement |
| Quality Standard: | OEM equivalent / ISO quality control | ||
Please verify fitment using your specific chassis number, VIN, or original part number before ordering.
| Chassis / Model | Engine | Years / Notes |
|---|---|---|
| ISUZU NKR66 / NKR66 E | 4HF1 (4.3L) | 1994–2005 — Light/medium truck, primary fitment |
| ISUZU NPR66 / NPR66 E | 4HF1 (4.3L) | 1994–2005 — Medium-duty truck, primary fitment |
| ISUZU NPS66 | 4HF1 (4.3L) | 1994–1996 (4×4 variant) |
| ISUZU NKR77 / NKR77 E | 4HG1, 4JJ1 | 4‑cylinder diesel variants |
| ISUZU NPR71 | 4HG1 / 4HG1T (4.6L) | 1996–2003 |
| Chassis / Model | Engine | Notes |
|---|---|---|
| ISUZU FTR, FVR, FRR, FSR | 4HE1, 4HF1, 4HG1, 6HK1, 6HH1 | Medium-heavy duty truck, early 2000s models |
| ISUZU CXZ, NQR | 4HG1-T, 4HE1-XS | Heavy-duty and vocational truck applications |
- Clutch chatter / judder on take-off (warped or heat-scored friction surface)
- Vibration felt through the driveline at specific RPM ranges (flywheel imbalance)
- Grinding noise when starting the engine (worn starter ring gear teeth)
- Hot spots / heat cracks / blueing visible on the friction surface (indicates thermal stress)
- Runout measured with a dial indicator exceeds service limit (≥ 0.15 mm / 0.0059 in)
- OE Quality: Manufactured to strict ISUZU OEM dimensional and material standards
- Precision-Machined Friction Surface: Ground to mirror-like finish for smooth engagement
- Dynamically Balanced: Factory-balanced to ISO 1940-1 Grade G6.3 to minimize vibration
- Forged Steel Construction: Superior durability compared to cast alternatives
- 142-Tooth Ring Gear: Factory-spec tooth profile for positive starter engagement
- Runout Guaranteed: Inspected for flatness and radial runout (≤ 0.15 mm)
- Long Service Life: Designed for heavy-duty commercial operation
- Material Verification: Forged steel composition tested to JIS/SAE standards
- Dimensional Accuracy: Verified against OE blueprints using CMM equipment
- Runout & Flatness Inspection: 100% checked with dial indicator
- Ring Gear Hardness Test: Tooth hardness verified on batch samples
- Dynamic Balancing: Balanced to ISO 1940-1 Grade G6.3
- ISO 9001:2015 / IATF 16949 Certified: Facility meets international quality standards
For pricing, availability, or bulk purchase of the ISUZU Flywheel 8-97115782-0 (8971157820) for NKR, NPR, NQR, 4HF1, 4HG1, 4HE1 engine applications, please contact our sales team for a competitive wholesale quote and expert technical support.
We respond to all inquiries within 24 hours.
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