Searching for a durable Isuzu 4JA1 crankshaft? Our forged steel replacement (OEM 8-94451-249-0) features induction-hardened journals to ensure maximum fatigue resistance in 2.5L diesel engines. Factory direct wholesale.
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Looking for a high-performance engine foundation? The Isuzu 4JA1 forged steel crankshaft (OEM: 8-94451-249-0) is a premium 2.5L engine component engineered for extreme industrial and automotive durability.
It is specifically designed to resolve journal surface wear and torsional fatigue in Isuzu TF Pickups, Panthers, and Elf trucks, providing a precision-hardened journal surface for extended bearing life under heavy delivery cycles.
Bulk wholesale stock ready for immediate international shipping.
A staple in our wholesale catalog, this Isuzu 4JA1 Cast Iron Crankshaft is engineered to provide a reliable repair solution for Isuzu’s widely used 2.5L diesel platform. As a key item in our Commercial Truck Engine Components inventory, this unit serves as a direct replacement for worn or damaged motor shafts found in the legendary Isuzu Panther and TFR pickups. We maintain consistent stock levels to ensure immediate dispatch, supporting fleet maintenance and individual vehicle restoration in markets where the 4JA1 is a trusted workhorse.
Manufactured from durable spheroidal graphite cast iron, this crankshaft offers a balance of strength and economy suitable for naturally aspirated and light-turbo applications. It addresses common issues such as journal wear and fatigue typical in high-mileage utility vehicles. By providing precise dimensional accuracy and vibration control, this component extends the life of your vehicle without the higher cost of performance forged parts.
| Technical Parameter | Detailed Specification |
|---|---|
| Engine Series | Isuzu 4JA1, 4JA1-T (2.5L 4-Cylinder) |
| OEM Part Number | 8-94451-249-0 / 8-94451-249-1 / 8944512490 |
| Material / Process | 42CrMo Forged Steel | Induction Hardened |
| Surface Hardness | HRC 55-62 (Main and Rod Journals) |
| Applicable Vehicles | Isuzu TF Pickup, Panther, Elf, KB250, Chevrolet LUV |
| Manufacturing Standard | OEM Precision Fit and Dynamic Balance Tested |
Technician’s Note: The Isuzu 4JA1 (2.5L) and 4JB1 (2.8L) engines look nearly identical externally, but their crankshafts have different strokes. Before installation, you MUST measure the stroke or check the casting number. Installing a 4JB1 crank (102mm stroke) into a 4JA1 block (designed for 92mm) will cause the pistons to hit the cylinder head, resulting in catastrophic engine failure.
| Engine Model | Application Field | Equipment Models |
|---|---|---|
| 4JA1 (N/A) | MPV / SUV |
|
| 4JA1-T | Pickups |
|
| 4JA1 | Light Commercial |
|
This Isuzu 4JA1 Cast Iron Crankshaft is a vital part of our comprehensive Commercial Truck Engine Components range. From family movers like the Panther to rugged farm pickups, we supply the reliable engine cores you need.
Category coverage: We offer an extensive selection of crankshafts for Isuzu C, E, B, and 6H 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: What is the benefit of a forged steel crankshaft for the Isuzu 4JA1 pickup engine?
A: The 4JA1 is often used for heavy hauling and high-mileage delivery. Our forged steel (42CrMo) version offers significantly higher structural elasticity and tensile strength compared to standard cast iron, preventing snapping and bending under high-torque conditions.
Q2: What is the main bearing torque specification for the Isuzu 2.5L 4JA1?
A: For a reliable engine rebuild, the main bearing cap bolts should be torqued to 83 Nm (61 lb.ft). We strongly recommend following the spiral sequence from the center out to ensure perfectly centered alignment and smooth rotation.
Q3: How do I identify if part 8-94451-249-0 fits my TF Pickup?
A: Part number 8-94451-249-0 is the primary OEM reference for the 2.5L 4JA1 non-turbo and low-boost turbo engines. You can verify this by checking the engine stamp on the block or cross-referencing the casting number found on your original crankshaft web.
Note: Customized/billet development based on drawings or samples is also available for high-performance or obsolete engine applications.
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