High-tensile forged steel Isuzu 4JJ1 crankshaft designed to resolve common snapping and journal wear in 3.0L diesel engines. Replaces OEM 8-98012-244-0 for NPR trucks and Hitachi excavators with reinforced 42CrMo durability.
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The Isuzu 4JJ1 forged steel crankshaft (OEM: 8-98012-244-0) is a high-performance replacement engineered to eliminate journal scoring and torsional snapping issues.
It provides a precision match for Isuzu NPR, D-Max trucks, and Hitachi ZX130 excavators, specifically designed with induction-hardened fillets to withstand the high common rail pressures of 4JJ1-TC industrial configurations.
Bulk wholesale stock available for immediate global export.
A staple in our wholesale catalog, this Isuzu 4JJ1 Forged Crankshaft is engineered to match the high-performance standards of Isuzu’s modern 3.0L DOHC common rail engines. As a critical component in our Commercial Truck Engine Components inventory, this unit serves as a robust replacement for worn or damaged engine shafts often encountered in high-mileage Isuzu D-Max pickups and ELF logistics trucks. We maintain deep stock levels to ensure immediate dispatch, minimizing downtime for fleet managers and private owners who rely on the 4JJ1 platform for daily operations.
Manufactured from premium forged steel, this crankshaft is designed to withstand the intense combustion pressures and torsional loads characteristic of the turbocharged 4JJ1-TC engine. It addresses common failure points such as journal fatigue and vibration-induced wear found in heavy-duty applications. By providing a dynamically balanced and precision-ground rotating assembly, this component ensures the smooth, quiet, and powerful performance that modern diesel operators expect.
| Technical Parameter | Detailed Specification |
|---|---|
| Engine Compatibility | Isuzu 4JJ1, 4JJ1-TC, 4JJ1-TCC, 4JJ1-TCS |
| OEM Part Number | 8-98012-244-0 / 8-97371-965-0 / 8-98012-244-1 |
| Cylinder / Displacement | 4 Cylinders | 3.0 Litre Diesel |
| Material / Process | 42CrMo Forged Steel | Induction Hardened |
| Surface Hardness | HRC 55-62 (Journal and Fillet Radius) |
| Machine Fitment | Hitachi ZX120, ZX130, ZX135; JCB JS130, JS145 |
Technician’s Note: The 4JJ1 is a precision engine. When installing a new crankshaft, it is critical to inspect the main bearing ladder frame (bedplate) for any signs of distortion or fretting. Additionally, ensure that the crankshaft position sensor (CKP) reluctor wheel is handled with care if transferring from the old unit, as any damage to the teeth will cause starting issues.
| Engine Model | Application Field | Equipment Models |
|---|---|---|
| 4JJ1-TC / TCX | Pickups & SUVs |
|
| 4JJ1-TCS | Commercial Truck |
|
| 4JJ1-X | Industrial |
|
This Isuzu 4JJ1 Forged Crankshaft is a key highlight in our comprehensive Heavy Duty Diesel Engine Parts range. From rugged pickups to industrial earthmovers, we supply the rotating assemblies that drive your machinery.
Category coverage: We offer an extensive selection of crankshafts for Isuzu B, J, and N series engines, including forged and cast options.
| Model | Model | Model | Model |
|---|---|---|---|
| 4HF1 | 4BG1 | 4ZD1 | 6BG1 |
| 4HG1T | 4FC1 | 4ZA1 | 6HE1 |
| 4HK1 | 4JA1 | 4ZB1 | 6HK1 |
| 4HE1T | 4JB1/4JB1T | 4BD1 | 6SD1 |
| 4BA1 | 4DA1 | 4JJ1 | 6WA1 |
| 4BC2 (DB33) | DH100 | G161 | 6WG1 |
| 4JG1 | C223 | 6BB1 (NEW) | 6HH1 |
| 4JG2 | C240 | 6BB1 (OLD) | 6QA1 |
| C190 | 600P | DB58 | 10PC1 |
| 4BB1A | 4ZE1 | 6BF1 | 10PB1 |
| 6BD1 | 10PE1 | 4BE1 | 12PD1 |
| 6SA1 | 10PD1 | 12PC1 |
View all specs in our Isuzu Commercial & Industrial Crankshaft Catalog.
Q1: Why is a forged steel crankshaft recommended over cast versions for the 4JJ1-TC?
A: The 4JJ1-TC common rail engine generates high peak torque. Cast iron crankshafts in this model are prone to fatigue snapping at the journals under high load. Our 42CrMo forged steel crankshaft offers the superior tensile strength and structural elasticity required for heavy-duty excavator and truck use.
Q2: What are the main bearing torque specifications for the Isuzu 4JJ1 rebuild?
A: For the Isuzu 4JJ1, the main bearing cap bolts should be torqued in stages: initially to 39 Nm (29 lb.ft), then tightened to an angle of 60 degrees. Always use a spiral tightening sequence starting from the center bearing to ensure correct crankshaft alignment.
Q3: How do I identify if the 8-98012-244-0 fits my specific vehicle?
A: This part number is the primary OEM reference for the 3.0L 4JJ1 series utilized in Isuzu NPR trucks and Hitachi ZAXIS excavators. You can verify the compatibility by checking the engine data plate for the 4JJ1 designation or cross-referencing with your original casting number.
Note: Customized/billet development based on drawings or samples is also available for high-performance or obsolete engine applications.
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