This heavy-duty Isuzu 4JG2 cylinder head resolves common thermal cracking and warping issues in 3.1L diesel engines. Replaces OEM 8-97086-338-2 for Isuzu Trooper and Rodeo fleets with reinforced cast iron. Wholesale ready.
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The Isuzu 4JG2 cylinder head (OEM: 8-97086-338-2) is a high-durability cast iron component designed for 3.1L OHV diesel engines.
It specifically addresses the pain points of thermal fatigue cracking between valve seats and cylinder head warping in Isuzu Trooper, Bighorn, and industrial forklifts, providing a reinforced casting structure for long-term reliability.
Bulk wholesale stock available for immediate global export.
Source a quality Isuzu 4JG2 Cylinder Head replacement from Ruich Value, your reliable wholesale supplier. This durable Cast Iron cylinder head fits the Isuzu 4JG2 engine series (3.1L, Inline-4, OHV 8V), powering models like the Trooper, Bighorn, MU, Frontera (and Opel/Holden equivalents). Features the standard “Big Valve” design for this engine. Crucially, verify the correct Part Number for your specific NA (4JG2) or Turbo (4JG2T) engine. Reference PNs include 8-97089-280-1, 8-97120-278-2, 8-97086-338-4.
| Technical Parameter | Detailed Specification |
|---|---|
| Engine Series | Isuzu 4JG2, 4JG2-T, 4JG2-TC (3.1L) |
| OEM Part Number | 8-97086-338-2 / 8-97086-338-0 / 8970863382 |
| Valve Configuration | OHV (Overhead Valve), 8 Valves (8V) |
| Casting Material | Alloyed Gray Cast Iron (Reinforced) |
| Main Applications | Isuzu Trooper, Bighorn, Rodeo, Opel Monterey |
| Industrial Applications | TCM, Hyster, Toyota Forklifts; Gen-sets |
Note: Naturally Aspirated (4JG2) and Turbo (4JG2T) engines often require different cylinder heads.
ALWAYS verify the correct Part Number for your specific engine.
Explore our extensive range of cylinder heads for various Isuzu engines:
| Model | Model | Model | Model |
|---|---|---|---|
| 3LD1 | 4BA1 | X17D 4EE1 | 6HK1 |
| 4JG2 | 4DR7 | TC4EE1 | 6D22/6D24 |
| 4ZD1 | 4BD1 | 6VE1/6VD1 | 4JJ1 |
| 4ZE1(round cc) | 4BD2T | 4HK1 | 4LE1 |
| 4ZE1 | 4HG1 / 4HG1-T | 4KH1 | 4ZD1 |
| 4JA1 | 4HF1 | 4BE1 | 4ZD1-new |
| 4JX1 | 4HE1 | 6BD1 | 4ZE1 |
| 4ZE3 | 6SD1 | 4JB1 / 4JB1T |
Custom cylinder head development based on drawings or samples may be possible.
Q1: Why do Isuzu 4JG2 cylinder heads often crack between the valves?
A: Cracking in the 3.1L 4JG2 engine is primarily caused by localized thermal stress during heavy load or cooling system inefficiency. Our replacement head utilizes a reinforced alloyed cast iron with improved wall thickness in critical areas to resist this thermal fatigue.
Q2: What are the head bolt torque specifications for the 4JG2 engine?
A: The 4JG2 cylinder head bolts should be torqued in stages: initially to 49 Nm, then 98 Nm, and finally a 60-90 degree angle turn. Always follow the spiral tightening sequence starting from the center to ensure an even seal and prevent head gasket failure.
Q3: Is this head compatible with both naturally aspirated and turbocharged 4JG2 engines?
A: Yes, part number 8-97086-338-2 is the universal OEM reference for the 4JG2 engine series. It is designed to handle the internal pressures of both the 4JG2 naturally aspirated and the 4JG2-T turbocharged variants found in Isuzu Trooper and industrial equipment.
Order the Isuzu 4JG2 Cylinder Head or request wholesale pricing. Please be ready to verify your engine type (NA or Turbo) and required Part Number.
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