DOHC 16-Valve Cylinder Head Assembly in High-Strength Aluminum Alloy for Direct OEM Replacement

Cylinder head assembly seals the combustion chambers, houses the valvetrain and injectors, and provides critical airflow passages. Ensures efficient combustion and engine performance for Isuzu 4JJ1-T/4JK1 diesel engines.

The Cylinder Head Assembly (OEM Numbers: 8-98223019-2 / 8982230192 and 8-97355970-9 / 8973559709) is a premium-quality, direct replacement engine component designed for Isuzu TFR pickups and compatible vehicles equipped with 4JJ1-T or 4JK1 diesel engines.

• OE Quality: Manufactured to Isuzu dimensional and material specifications for perfect fit and reliable engine sealing
• DOHC 16-Valve Design: Provides optimal airflow for improved combustion efficiency and power output
• Aluminum Alloy Construction: Lightweight with excellent heat dissipation properties, reducing engine weight and improving thermal management
• Precision Machined: Accurate valve guides, camshaft journals, and injector bores for consistent performance
• High-Pressure Common Rail Ready: Designed to work with CRDI fuel injection systems for precise fuel delivery
• Restores Engine Performance: Eliminates compression loss, coolant consumption, and overheating caused by damaged heads
• Direct Replacement: Matches OE dimensions and bolt patterns - simple installation
• Wide Compatibility: Fits multiple Isuzu vehicles and equipment platforms including trucks, pickups, and excavators
• Cost-Effective: Affordable alternative to genuine OEM cylinder heads without compromising quality

This cylinder head assembly is specifically designed for Isuzu 4JJ1-T and 4JK1 engines in various applications.

• ISUZU TFR (pickup, primary fitment)
• ISUZU D-MAX (pickup)
• ISUZU NHR, NLR, NMR, NNR, NQR, NPR (commercial trucks)
• ISUZU CX130B (excavator)
• Hitachi ZX130-3, ZX130-5, ZX170-5A (excavators - compatible)
• SY135 (excavator - compatible)

Installation steps (overview for 4JJ1/4JK1 engine):

1. Drain coolant and engine oil - remove radiator hoses, thermostat, and other components as needed
2. Remove intake/exhaust manifolds, timing components, and valve cover
3. Remove cylinder head bolts in reverse order of tightening sequence
4. Lift cylinder head - inspect for cracks or damage
5. Clean block deck and cylinder head surface - remove old gasket material. Do not scratch surfaces
6. Check flatness - use straight edge and feeler gauge. Block deck and head must be within OE specification
7. Chase cylinder head bolt holes - ensure clean, undamaged threads
8. Install new head gasket - position with correct orientation
9. Install new cylinder head assembly - carefully lower onto gasket. Do not shift once in contact
10. Install new cylinder head bolts (recommended) - lubricate threads and underheads with engine oil
11. Torque bolts in sequence - follow manufacturer specification (refer to 4JJ1/4JK1 service manual)
12. Reinstall all components - timing, manifolds, valve train, etc
13. Refill coolant and oil - use proper fluids
14. Start engine - check for leaks, air in cooling system, and abnormal noise
15. Re-check after heat cycle - inspect for leaks and re-torque if required

• Material Verification: Aluminum alloy composition and heat treatment tested to OE specifications
• Dimensional Inspection: Deck flatness, valve guide bore alignment, camshaft journal sizing, and bolt hole locations verified against OE blueprints
• Pressure Test: Each head tested for casting porosity and coolant passage integrity
• Surface Finish: Deck and combustion chamber surfaces checked for proper finish
• Visual Inspection: 100% checked for casting defects, cracks, or machining errors
• Packaged Safely: Coated with anti-rust oil, wrapped in protective plastic, boxed with foam to prevent damage during transit

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea