ISUZU 4HG1 MLS Cylinder Head Gasket with Multi-layer Steel Construction and ISO 9001 Certification

The cylinder head gasket carrying OEM numbers 8-97144986-1 and 8971449861 seals the combustion chamber between the cylinder head and engine block on the ISUZU 4HG1 4.3L naturally aspirated diesel engine. It is a direct replacement for NQR71 series medium‑duty trucks – a chassis variant with a longer wheelbase and higher gross vehicle weight rating than standard NKR/NPR models – manufactured from the mid‑1990s through the early 2000s.

The 4HG1 is a 4,334 cc inline‑four diesel engine with a bore and stroke of 112 mm * 110 mm. It produces up to 96 kW (130 PS) at 3,200 rpm and maximum torque of 310 Nm at 1,800 rpm, with a compression ratio of 18.5:1. The NQR71 chassis is rated for GVWR up to 9,500 kg, placing the engine under sustained high load during highway operation or stop‑start delivery.

This gasket uses multi‑layer steel (MLS) construction – typically three precision‑stamped steel layers with a heat‑activated elastomer coating on the outer surfaces. The MLS design withstands the high cylinder pressures of the 4HG1's 18.5:1 compression ratio while accommodating thermal expansion differences between the cast‑iron block and head.

This ISUZU NQR71 cylinder head gasket 8-97144986-1 directly replaces the factory gasket in the following configurations:

The NQR71 is distinct from the NKR (light) and NPR (medium) chassis. It sits between them in GVWR and wheelbase, often used for refrigerated box trucks, flatbeds, and dump bodies. This gasket is interchangeable with 8-97144985-0 – the same MLS design for the 4HG1 family.

The manufacturing facility holds ISO 9001:2015 certification. A certificate of analysis (COA) with batch traceability is available for all wholesale orders.

• Individual packaging: Sealed in anti‑rust VCI paper, placed in foam‑lined neutral carton
• Carton dimensions: 58 * 32 * 3 cm per unit
• Net weight: 0.85 kg per gasket; gross weight (with packaging): approx. 1.2 kg
• Master carton: 50 units per export carton (approx. 58 * 48 * 40 cm, 45 kg)
• 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: 84841000

The ISUZU NQR71 4HG1 cylinder head gasket 8-97144986-1 is an OEM‑specification, multi‑layer steel (MLS) replacement for the 4.3L diesel engine. It seals the 112 mm bores, resists 18.5:1 compression pressures, and prevents coolant‑oil cross‑contamination. One part number covers NQR71, NKR66 XD, NPR66 XD, and all other 4HG1‑powered ISUZU trucks.

ISO 9001 certification, batch traceability, and 0.85 kg packaging make this a practical choice for fleet maintenance and wholesale distribution. Order a sample unit today to verify fitment on your 4HG1 engine.