Cylinder Head Assembly 16-Valve DOHC High-Strength Alloy Cast Iron for ISUZU 4HK1 5.2L Common Rail Direct Injection Engine

The cylinder head assembly carrying OEM numbers 8-98008363-6 and 8-98018454-5 is a direct replacement for the ISUZU 4HK1 5.2L inline-four common rail diesel engine. Designed for medium-duty trucks including ISUZU NQR75, NPR5, and 700P series, as well as off-road equipment like Hitachi ZX200-3 and ZX240-3 excavators.

The 4HK1 is a 5,193 cc turbocharged diesel engine with bore and stroke of 115 mm × 125 mm, delivering 215 to 240 horsepower at 2,400-2,500 rpm and torque up to 452 lb-ft at 1,850 rpm. Operating with a common rail fuel injection system at up to 1,600 bar, the cylinder head is precision-manufactured to withstand extreme thermal and mechanical loads.

This ISUZU 4HK1 cylinder head assembly 8-98008363-6 directly replaces the factory head in the following configurations:

Cross-industry compatibility extends to:

• Hitachi ZX210L-3, ZX330 excavators
• Case CX210B, CX210C excavators
• Other OEMs using ISUZU 4HK1 base engine

• Direct OE Replacement - Manufactured to original equipment specifications using same engineering blueprints and material standards
• 16-Valve DOHC Configuration - Four valves per cylinder for improved volumetric efficiency, power output, and fuel economy
• High-Strength Alloy Cast Iron - Contains molybdenum, chromium, and nickel for elevated thermal stability and crack resistance
• Precision-Machined Combustion Chambers - Factory swirl pattern promotes thorough fuel-air mixing for complete combustion
• Integral Coolant Flow Optimization - Directs flow toward exhaust valve bridge to reduce risk of valve seat recession
• Hardened Valve Seats and Valve Guides - Powder metal alloy seats and precision-machined iron alloy guides with Viton stem seals
• Fully Assembled - Ready to Install - Reduces labor time by 2-3 hours compared to building from components
• Extensive Cross-Reference Coverage - Interchangeable with wide range of OEM part numbers

Each cylinder head batch undergoes comprehensive verification with IATF 16949 certification:

• Individual packaging: Sealed in anti-rust VCI bag, foam-lined carton
• Carton dimensions: 80 × 40 × 30 cm (approximate)
• Net weight: Approximately 70-80 kg (fully assembled)
• Gross weight (with packaging): Approximately 90-100 kg
• Master carton: Palletized – contact for specifics
• Lead time: 5-10 working days for stock orders
• Minimum order quantity: 1 piece (sample order available)
• Shipping: Sea freight (LCL/FCL) from Shanghai, Ningbo, Guangzhou ports

For complete top-end rebuilds, matching head gaskets (4HK1), head bolts (8-98008363-6 family), and valve adjustment shims are also available.

The ISUZU 4HK1 cylinder head assembly 8-98008363-6 (with supersession 8-98018454-5) is an OE-specification replacement for the 5.2L common rail diesel engine in NQR75, NPR5, 700P trucks, and Hitachi/Case excavators. Features 16-valve DOHC design, alloy iron casting, and precision-machined combustion chambers. IATF 16949 certified with batch traceability.

Order a sample unit today to verify fitment on your 4HK1 engine – the same head covers NQR, NPR, FRR, and off-road applications.