NPR 2005-2008 5.2DT 4HK1 Aluminum Diesel Engine Cylinder Head for Isuzu ZX200-3 EX200-3 5.2L Truck – OEM 8981706171

Product Overview: This aluminium diesel cylinder head assembly is engineered for the Isuzu 4HK1 5.2-litre four-cylinder turbo-diesel engine, a heavy-duty powerplant used in NPR and NPR-HD commercial trucks and in construction and industrial machinery. It is supplied as a fully assembled replacement unit with valves, guides and seats installed, machined to original equipment tolerances, making it suitable for an in-frame overhaul or a complete engine rebuild.

Key Features: The casting is produced from high-grade aluminium alloy and CNC-machined for accurate deck flatness, correct valve seat concentricity and consistent combustion chamber volume. Valve guides and seats are pre-installed and honed for even sealing and balanced compression, and the injector bores and valve ports are precision machined to suit the 4HK1 combustion system. Reinforced casting around the fire deck and valve bridge improves resistance to thermal cracking under the continuous high cylinder pressures typical of heavy-duty diesel operation.

Vehicle Compatibility: This head fits Isuzu NPR (2005-2008) and NPR-HD (2005-2013) models equipped with the 5.2DT 4HK1 engine, as well as Isuzu ZX200-3 and EX200-3 excavators and related 5.2-litre commercial and industrial applications. Because the 4HK1 was produced in several configurations, confirm the engine code, casting number and OE reference against the original component before ordering.

Specifications: Engine code 4HK1; displacement 5.2 litres; inline four-cylinder turbo-diesel; material aluminium alloy; standard size; new condition; complete assembly; 12-month warranty; intended for replacement and repair.

OEM / Reference Numbers: 8981706171. Cross-reference this number with the casting marks and part label on the original cylinder head to confirm the correct specification is supplied.

Applications: Ideal for light and medium commercial trucks, delivery fleets, excavators and industrial equipment powered by the 4HK1, as well as workshop overhauls, engine rebuilds and preventive maintenance programmes requiring a durable factory-specification diesel head.

Benefits / Replacement Information: Fitting this assembly restores compression, corrects coolant and combustion leakage caused by cracking or distortion, and removes the downtime and cost of reconditioning the original casting. A complete unit helps fleets return vehicles and machinery to service quickly.

Installation or Fitment Notes: Installation should be carried out by a qualified technician. Clean and check the block deck for flatness, fit new head bolts and gasket, and torque in the correct sequence to the manufacturer's specification. Verify injector seat condition, valve clearances and cam timing during assembly, then pressure test and bleed the cooling system before returning the engine to service.