Applicable Engine:
4JJ1 / 4JJ1-TC / 4JJ1-TCS / 4JK1 / 4JJ1 NEW
Applicable Brand:
ISUZU
Applicable Car:
D-MAX
Product parameters:
| Displacement | Fuel | Cylinder | Vale | Camshaft | Year |
| 2.5/3.0 |
Diesel
|
4 | 16 | 2 | 2004- |
Cylinder Head
Cylinder Head for ISUZU 4JJ1 TCS 3.0L 4JK1 2.5L Turbo Diesel Engine 908350 8973559708 D-MAX 3.0 engine head
Introduction
Product NO.
| ML NO. | OEM NO. | REF NO. |
| MLG054A | 8973559708 8973559709 8982230192 8981756061 | 908350 |
| MLG054B | 8982230191 |
Product Information Cylinder Head
1. Product Overview
The ISUZU 4JJ1 is a robust and fuel-efficient 3.0L inline 4-cylinder turbo diesel engine used widely in light commercial vehicles and pickups. It features a DOHC 16-valve aluminum cylinder head and high-pressure common rail (CRDI) fuel injection, making it ideal for both urban delivery and off-road use.
Due to the engine’s high compression and operating temperature, a high-quality, pressure-tested aluminum head is crucial in both repairs and rebuilds.
2. Technical Specifications
| Item | Specification |
|---|---|
| Engine Code | 4JJ1 |
| Displacement | 3.0L (2999 cc) |
| Valvetrain | DOHC – 16 Valves |
| Cylinder Head Material | Aluminum Alloy |
| Fuel System | Common Rail Direct Injection (CRDi) |
| Aspiration | Turbocharged (intercooler) |
| Timing Drive | Timing Gears / Chain |
| Cooling Type | Water-cooled |
| Compression Ratio | 17.5:1 – 18.0:1 (varies) |
| Emissions Standard | Euro 3 – Euro 5 / DPD/DOC in some markets |
3. OEM Cylinder Head Part Numbers
| OEM Number | Notes |
|---|---|
| 8973005691 | Early 4JJ1 models, mechanical accessories |
| 8980116303 | Common for D-MAX and N-Series |
| 8980116302 / 8980116301 | Updated castings with improved durability |
| 8-98011630-0 | Also appears on NPR/NKR ELF trucks |
| 897300-5690 | May also fit some cross-compatible 4JH1 applications |
⚠ Some castings differ by injector seat depth, intake port shape, and EGR passage — verify by VIN or casting code.
4. Compatible Vehicles
| Model | Engine | Years |
|---|---|---|
| Isuzu D-MAX 3.0 TD | 4JJ1-TC / 4JJ1-TCX | 2004–2020+ |
| Isuzu MU-X 3.0 TD | 4JJ1-TCX | 2013–Present |
| Isuzu NPR / NQR / NKR | 4JJ1 | 2005–Present |
| Chevrolet Colorado / Trailblazer (some markets) | 4JJ1-TC | 2012–2018 |
| JMC Boarding / Carrying (license-built) | 4JJ1 | Chinese variants |
| Qingling Truck / QL 1070 / QL 1100 | 4JJ1 | Domestic Chinese truck platforms |
5. Product Options
| Product Type | Includes |
|---|---|
| Bare Cylinder Head | Casting only |
| Semi-Assembled | Valves, guides, retainers |
| Fully Assembled Head | Camshafts, rockers, complete valve train pre-installed |
High-grade aluminum casting
Pressure tested and CNC machined
Cam journal clearance pre-verified
Compatible with OE rocker cover & injectors
6. Installation Notes
- Use new head gasket (multi-layer steel) and head bolts (TTY type)
- Apply correct torque sequence (follow ISUZU spec: typically 39Nm + 90° + 90°)
- Replace or service injector copper washers – carbon blow-by can damage new head
- Ensure oil passages and cooling system are clean and flushed
- Always bleed air from the cooling system thoroughly
- Prime fuel system after install – do not crank dry
7. Common Cylinder Head Failures & Repair Advice
| Failure Mode | Symptom | Cause | Suggested Fix |
|---|---|---|---|
| Cracked Head (pre-combustion area) | Coolant loss, white smoke, overheating | High operating temps, casting stress | Upgrade to reinforced casting; always replace radiator if overheating occurred |
| Coolant in Oil / Oil in Coolant | Milky oil, radiator sludge | Internal head crack or EGR cooler leak | Pressure test head and EGR cooler; replace MLS gasket |
| Warped Head / Blown Gasket | Poor idle, coolant pressure, misfire | Prolonged overheat or poor maintenance | Resurface head (flatness tolerance ≤ 0.05 mm) and use new bolts |
| Injector Blow-by (seat damage) | Misfire, black injector base | Failed copper seal or seat erosion | Resurface injector seat; always torque properly with new washers |
| Valve wear / cam scoring | Noise, poor performance | Low oil quality or interval | Replace cam, inspect lifters; ensure proper lubrication before startup |
8. Key Export Markets
- Southeast Asia: Philippines, Thailand, Indonesia
- Africa: Kenya, Nigeria, Ghana, South Africa
- Latin America: Bolivia, Ecuador, Peru
- Oceania: Australia, New Zealand
- Middle East: Iraq, UAE, Saudi Arabia
- China (Export): Qingling ISUZU trucks & JMC 4JJ1 variants
Cylinder Head for ISUZU 4JK1 2.5L Turbo Diesel Engine
DOHC 16-Valve | Common Rail Direct Injection (CRDi) | Turbocharged | Aluminum Alloy
1. Product Overview
The ISUZU 4JK1-TC is a 2.5L inline-4 turbo diesel engine widely used in light commercial vehicles and pickup trucks. It features a DOHC 16-valve aluminum cylinder head, common rail direct injection, and intercooler-equipped turbocharging. The 4JK1 is known for its fuel economy, torque, and durability in global markets.
The cylinder head plays a vital role in supporting high-pressure injection and VGT turbocharging, making genuine-spec aluminum cylinder heads essential for engine longevity.
2. Technical Specifications
| Item | Specification |
|---|---|
| Engine Code | 4JK1-TC |
| Displacement | 2.5L (2499 cc) |
| Cylinder Head Type | DOHC – 16 Valves |
| Head Material | Aluminum Alloy |
| Aspiration | Turbocharged (intercooled) |
| Fuel System | Common Rail (Bosch or Denso) |
| Timing | Timing Chain |
| Cooling | Water-cooled |
| Compression Ratio | ~18.0:1 |
| Emissions | Euro 3 – Euro 5 (varies by region) |
3. OEM Cylinder Head Part Numbers
| OEM Part Number | Application |
|---|---|
| 8973296732 | Common casting for D-MAX & MU-X 2.5 |
| 8980181060 | Updated version with revised coolant ports |
| 8-97329673-0 | Also used in Asia/ME markets |
| 8980796870 | Newer Euro 4+ compatible version |
⚠ Always verify EGR port layout, injector seat depth, and coolant gallery configuration before ordering replacement.
4. Compatible Vehicles
| Model | Engine | Years |
|---|---|---|
| Isuzu D-MAX 2.5L | 4JK1-TC | 2006–2020 |
| Isuzu MU-X 2.5L (select regions) | 4JK1-TC | 2013–2017 |
| Isuzu TFR / TF Pickup | 4JK1 | Various export trims |
| Chevrolet Colorado / Trailblazer 2.5 | 4JK1 | Some ASEAN / LATAM variants |
| Qingling / Chinese Isuzu Co-brands | 4JK1 | CKD or domestic production |
5. Product Options
| Type | Includes |
|---|---|
| Bare Cylinder Head | No internals – raw casting |
| Semi-Complete Head | Valves, seats, guides, springs |
| Fully Assembled Head | With camshafts, valve train, pressure-tested |
✔ OEM-grade aluminum alloy
✔ CNC-machined deck and cam journals
✔ Pre-chamber and injector seat aligned to OE spec
✔ Suitable for mechanical & electronic VGT variants
6. Installation Notes
- Use new MLS head gasket and torque-to-yield head bolts
- Apply correct torque sequence and angle (typically 29Nm + 90° + 90°)
- Verify fuel injector seat condition – use new copper seals
- Clean all oil and coolant galleries before installation
- Check timing chain tension and camshaft alignment
- Prime the oil and fuel system fully before first start
7. Common Cylinder Head Issues & Repair Advice
| Failure Mode | Symptom | Cause | Repair |
|---|---|---|---|
| Cracked Cylinder Head | White smoke, coolant loss | Overheating or casting defect | Replace with pressure-tested upgraded casting |
| Oil in Coolant | Milky radiator fluid | Internal crack or failed gasket | Pressure test head & system; use new gasket |
| Injector Blow-by | Misfire, black around injector | Bad copper seal or worn seat | Reface seat, replace seals, torque properly |
| Camshaft Wear / Noise | Ticking or rattle | Oil starvation or dirty oil | Replace camshaft or head assembly |
| Warped Head | Overheat, low compression | Coolant loss or poor cooling | Machine flat (≤0.05mm), test and reinstall with new bolts |
8. Key Export Markets
- Asia: Thailand, Philippines, Malaysia, Pakistan, China
- Africa: Nigeria, Kenya, Ghana, Egypt
- Middle East: Iraq, Jordan, UAE, Saudi Arabia
- Latin America: Ecuador, Bolivia, Colombia
- Oceania: Papua New Guinea, Fiji
- Others: Russia, Bangladesh, Sri Lanka