Isuzu NPR, NPR-HD 2005-2008, 2005-2013 4HK1 4HK1 4HK1-TC Engine Cylinder Head OEM 8981706171 for Isuzu 5.2 Diesel – OEM 8981706171

Product Overview: Designed as a factory-specification replacement, this complete cylinder head assembly suits the 4HK1 common-rail turbo-diesel engine found in Isuzu NPR and similar models. It is supplied fully assembled with finish-machined camshaft journals, valve seats, valve guides and combustion chambers, so a cracked, warped or valve-damaged original head can be replaced without additional machining work.

Key Features: The casting is CNC-machined to original equipment tolerances for accurate deck flatness, correct valve seat concentricity and consistent combustion chamber volume across every cylinder. Valve guides and seats are pre-installed and honed for even sealing and balanced compression, and the high-grade aluminium alloy construction with reinforced walls around the valve bridge and fire deck improves durability under sustained thermal and mechanical load. Injector bores, glow plug threads and pre-chamber seats are precision machined to maintain correct fuel atomisation and combustion sealing under diesel cylinder pressures.

Vehicle Compatibility: This assembly is compatible with Isuzu NPR (2005-2008) and Isuzu NPR-HD (2005-2013). Typical production coverage spans 2005-2008 and 2005-2013, although availability varies by market and model year.

Specifications: Engine code 4HK1; four-cylinder diesel configuration; material high-grade aluminium alloy; Standard Size; new condition; supplied as a complete assembly; 12 Months warranty; place of origin Henan, China; intended for replacement and repair use.

OEM / Reference Numbers: 8981706171. Cross-reference this number with the casting identification and part label on the original component to confirm the correct specification.

Applications: Suitable for Isuzu NPR and Isuzu NPR-HD, covering everyday repairs, engine rebuilds, workshop overhauls and fleet maintenance where a factory-specification component is required. The durable design also suits delivery vans, pickups, minibuses, light trucks and utility vehicles operated under continuous heavy-duty cycles.

Benefits / Replacement Information: Installing this assembly restores lost compression, corrects coolant loss and combustion leakage caused by cracking or distortion, and removes the expense of machining and rebuilding the original head. A correctly specified replacement reduces the risk of repeat failure, helps restore original fuel economy and emissions performance, and returns the engine to reliable service with a predictable service life.

Installation or Fitment Notes: Confirm the engine code 4HK1 and OE number before ordering, and inspect the block deck and piston protrusion for flatness and correct height before fitting. Use new gaskets, head bolts and seals during installation, follow the manufacturer's torque sequence and tightening values, and refill with the correct grade of oil and coolant.