300mm Diameter Flywheel with Nodular Cast Iron Construction and Precision-Ground Clutch Surface for ISUZU NMR NQR 4HV1 Diesel Engine

The flywheel carrying OEM numbers 8-97366601-0 and 8973666010 is the engine-side rotating mass that stores rotational energy, mounts the clutch assembly, and carries the starter ring gear on ISUZU 4HV1 diesel engines. It is a direct replacement for NMR and NQR series medium-duty trucks, as well as NPR chassis that use the 4HV1 power unit from the late 2000s onward.

The 4HV1 is a 4,570 cc inline-four dual-fuel (CNG/propane) or diesel engine. When configured for diesel operation, it produces approximately 129 hp at 2,800-3,200 rpm and torque in the 285-330 Nm range. In alternate fuel configurations, the engine delivers 78-83 hp on natural gas or propane. The 4HV1 shares its heavy-duty block, crankshaft, and cylinder head design with the proven 4HF1 and 4HG1 engine families, using the same 112 mm cylinder bore.

The flywheel is a 300 mm diameter component forged or cast from high-strength nodular iron. It has three primary functions: smooth out engine firing impulses, provide a friction surface for the clutch disc, and carry the ring gear that the starter motor engages. The rear face is machined flat and true to serve as the clutch mounting surface; the outer circumference carries a pressed-fit ring gear with approximately 128-136 teeth (verify ring gear condition before reuse). Multiple bolt holes around the hub fasten the flywheel to the crankshaft flange using high-strength bolts that must be replaced rather than reused per ISUZU workshop practice.

A cracked flywheel, worn ring gear (chipped or missing teeth), or scored clutch surface causes starter grinding, clutch chatter, vibration, or complete drivetrain failure. This replacement flywheel restores the original rotating inertia (approximately 14-18 kg) and provides a fresh clutch friction surface. For workshops and fleet operators maintaining ISUZU NMR and NQR trucks, this direct-fit component eliminates the need to resurface or repair a worn original, returning the engine to factory specification in one installation.

This ISUZU 4HV1 flywheel 8-97366601-0 directly replaces the factory unit in the following configurations:

The 4HV1 engine family was produced for both diesel and dual-fuel applications. NMR and NQR chassis from model years 2009 to 2013 are the most common recipients of this flywheel, but the same part also fits later ELF models through 2021. For parts distributors serving ISUZU light- and medium-duty fleets, stocking this single SKU covers multiple chassis series across a production span of approximately 12 years.

• One Flywheel Covers All 4HV1 NMR/NQR Chassis - The same 8-97366601-0 flywheel fits NMR82, NQR82, NPR82, and NKR82 chassis. Distributors reduce inventory by stocking one SKU instead of separate part numbers for each chassis series.
• Prevents Common Starter Engagement Failures - When a starter motor grinds, skips, or spins without engaging the engine, the ring gear teeth are the first suspect. Replacing the flywheel with this unit restores a full set of sharp, hardened teeth.
• Provides a Fresh Clutch Surface for Long Service Life - This new flywheel provides a virgin friction surface matched to a new clutch disc - the professional way to complete a clutch replacement job.
• Eliminates Crankshaft Flange Damage from Worn Bolts - Installing this new flywheel with new bolts (as ISUZU recommends) restores the bolted joint to factory clamp load, preventing further crankshaft damage.
• ISO 9001 Certified with Batch Traceability - Each batch is manufactured in an ISO 9001:2015 certified facility. Material certificates and balance reports are retained for fleet maintenance programs requiring component traceability.

Each batch of the ISUZU 4HV1 flywheel 8-97366601-0 undergoes the following quality control procedures:

The facility holds ISO 9001:2015 certification. A certificate of conformance (COC) with material analysis and balance data is available for wholesale orders. For first-time buyers, a pre-shipment inspection report can be provided for a sample order.

• Individual packaging: Sealed in anti-rust VCI bag, foam-lined cardboard carton
• Carton dimensions: 32 × 32 × 12 cm per unit
• Net weight: 14-18 kg; gross weight (with packaging): 16-20 kg
• Master carton: 4-6 units per export carton (palletizable)
• Lead time: 5-10 working days for stock orders; 20-25 days for production orders above 50 pieces
• Minimum order quantity: 1 piece (sample order available; air freight recommended for singles due to weight)
• Shipping methods: FedEx, UPS, DHL freight for singles; sea freight (LCL/FCL) for pallet quantities
• Ports: Shanghai, Ningbo, Guangzhou

For workshops completing a full clutch replacement, the supplier also stocks matching 300 mm clutch cover assemblies, clutch discs, and release bearings for the 4HV1 engine. Contact the sales team with your forecasted monthly volume and destination port for a tiered price list.