Multi-layer steel (MLS) Cylinder Head Gasket for ISUZU 4HF1 NPR66 Truck - OEM Part Number 8-97105873-0

The cylinder head gasket carrying OEM numbers 8-97105873-0 and 8971058730 seals the combustion chamber between the cylinder head and engine block on the ISUZU 4HF1 4.3L naturally aspirated diesel engine. It serves as a direct replacement for NPR66 and NKR66 series medium-duty trucks manufactured from the mid-1990s through the early 2000s.
The 4HF1 is a 4,334 cc inline-four diesel engine with a bore and stroke of 112 mm * 110 mm, originally designed for Isuzu's N-series chassis. It produces up to 88 kW (120 PS) at 3,200 rpm and maximum torque of 285 Nm at 1,800 rpm, with a compression ratio of 19.0:1. This combination of displacement and compression demands a sealing component that withstands sustained cylinder pressures without blow-by or coolant cross-contamination.
The gasket is constructed from multi-layer steel (MLS) — a stack of precision-stamped steel layers designed to withstand the high compression cycles of an 18.5–19.0:1 diesel engine while maintaining a consistent seal across the 112 mm bore. Each unit weighs 0.74 kg and ships in a compact neutral carton, suitable for individual mechanic orders or bulk distribution. Manufactured in an ISO 9001 certified facility, every batch undergoes dimension verification and fire ring alignment checks before release.

This ISUZU NPR66 cylinder head gasket 8-97105873-0 directly replaces the factory gasket in the following configurations:

• ISUZU NPR66 — medium-duty truck, 4HF1 engine, 4,334 cc, 6-wheel configuration, model years 1994–2006
• ISUZU NKR66 — light-duty truck, 4HF1 engine
• ISUZU NQR66 — medium chassis, 4HF1 engine
• ISUZU Elf — Japanese domestic market (NPR, NKR, NQR series)
• ISUZU NPR 200 — export model with 4HF1 power unit
• Chevrolet / GMC W-series (selected markets with Isuzu-sourced 4HF1)

Each production batch of the ISUZU 4HF1 head gasket 8-97105873-0 undergoes the following verification:

• Fire ring bore alignment — Laser measurement of each fire ring opening against 112 mm ±0.03 mm tolerance
• Layer registration — Optical inspection of the 2 or 3 steel layers; edges must align within 0.2 mm of OE specification
• Gasket thickness — Digital micrometer measurement at multiple points; compressed thickness verified to OE range
• Material composition — Certificate of analysis confirming steel grade matches OE specification
• Elastomer coating integrity — Visual and adhesion test for bead placement, no voids or delamination
• Full dimensional inspection — CMM measurement against original ISUZU engineering drawings; 100% of critical dimensions verified
• Sample batch testing — Thermal cycle test: gasket mounted in press fixture, cycled from –20°C to 150°C for 100 cycles; torque loss measured within allowable range

• Individual packaging: Sealed in anti-rust VCI paper, placed in foam-lined neutral carton
• Carton dimensions: 55 * 30 * 3 cm per unit
• Net weight: 0.74 kg per gasket; gross weight (with packaging): approx. 1.1 kg
• Master carton: 50 units per export carton
• Lead time: 3–7 working days for stock orders; 15–20 days for production orders above 500 pieces
• Minimum order quantity: 1 piece (sample order available)
• Shipping methods: FedEx, UPS, DHL for samples and small orders; sea freight (LCL/FCL) from Shanghai, Ningbo, Guangzhou ports
• H/S Code: 848410000

The ISUZU NPR66 4HF1 cylinder head gasket 8-97105873-0 is an OEM-specification, multi-layer steel replacement sealing the 112 mm bores of the 4.3L diesel engine. It restores factory compression pressure, keeps coolant and oil in their correct passages, and prevents combustion gas leakage into the cooling system. One part number covers NPR66, NKR66, and NQR66 chassis with the same 4HF1 engine.
ISO 9001 certification, batch traceability, and 0.74 kg lightweight packaging make this a practical choice for fleet maintenance and wholesale distribution. Order a sample unit today to verify fitment on your 4HF1 engine — the same gasket covers all N-series trucks equipped with the 4.3L naturally aspirated diesel.