ISUZU 4BE1 Engine Crankshaft Assembly with Forged Steel Construction and Precision Journal Machining
| Engine Displacement: | 3,636 Cc | Connecting Rod Journal Diameter: | 64 Mm |
| Overall Length: | 648 Mm | Eccentric Diameter: | 52.5 Mm |
| Hardness: | HRC 45–58 | Net Weight: | 35–36 Kg |
| Main Journal Diameter: | 76 Mm | Material: | Forged Steel / Cast Iron |
| High Light: | Forged Steel Construction Engine Crankshaft,Precision Journal Machining Crankshaft Assembly,Hardened and Polished Bearing Journals ISUZU 4BE1 Crankshaft |
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Engine Crankshaft 8-94416373-2 8944163732 for ISUZU NPR ELF 150 250 4BE1 3.6L — Verified OEM Fit Forged Steel Crankshaft Assembly
The Engine Crankshaft with OEM numbers 8-94416373-2 and 8944163732 is a verified direct-fit replacement for ISUZU NPR / ELF 150 / ELF 250 / N-Series light trucks and MU-X utility vehicles equipped with the 4BE1 3.6L diesel engine. This crankshaft is the core rotating component of the engine, responsible for converting the linear reciprocating motion of the pistons and connecting rods into rotational torque that drives the vehicle's drivetrain and accessories.
The crankshaft is the most critical component in the engine's power conversion process. It receives force from the connecting rods and converts it into torque, which is transmitted through the crankshaft to drive the vehicle and operate engine accessories. The crankshaft must have sufficient strength and rigidity, and its journal surfaces must be wear-resistant, uniform, and balanced.
The 4BE1 engine is a 3.6L four-cylinder direct-injection diesel engine widely used in ISUZU ELF/NPR trucks from 1990 to 2024. The 8-94416373-2 crankshaft features a forged steel construction with hardened and polished bearing journals, balanced counterweights, and precision oil passages to ensure smooth engine rotation, stable combustion timing, and long service life in commercial diesel applications.
Replace the crankshaft when any of these symptoms appear:
- Heavy knocking noise from the bottom end of the engine — worn main bearings or connecting rod bearings allow excessive crankshaft movement.
- Abnormal engine vibration — imbalance, wear, or scoring on the crankshaft journals causes vibration throughout the engine operating range.
- Low oil pressure — worn crankshaft journals increase bearing clearance, reducing oil pressure and triggering the warning light.
- Metal debris in the oil pan — bearing material particles indicate crankshaft journal wear or scoring.
- Engine seizing or inability to rotate — severe bearing failure or thrust bearing wear can seize the crankshaft.
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Part Number (Short) | 8-94416373-2 | ISUZU OEM Parts Database |
| Part Number (Long) | 8944163732 | ISUZU OEM Parts Database |
| Part Name | Crankshaft | ISUZU EPC |
| Engine Compatibility | 4BE1 (3.6L, 4-cylinder, DI) | ISUZU application catalog |
| Vehicle Models | ISUZU NPR / ELF 150 / ELF 250 / N-Series / MU-X | ISUZU application catalog |
| Eccentric Diameter | 52.5 mm | Lange Machinery specification |
| Main Journal Diameter | 76 mm | Lange Machinery specification |
| Connecting Rod Journal Diameter | 64 mm | Lange Machinery specification |
| Overall Length | 648 mm | Lange Machinery specification |
| Material | Forged Steel / Cast Iron | Product specification |
| Hardness | HRC 45 -58 | Product specification |
| Net Weight | 35 -36 kg | Product specification |
| Package Size | 72 × 20 × 18 cm | Product specification |
| Cylinders | 4 | Product specification |
| Displacement | 3,636 cc | HECLES specification |
| Warranty | 12 Months | Manufacturer standard |
| Certification | ISO/TS 16949 | Third-party system audit |
| Type | Number |
|---|---|
| Primary OEM — Short | 8-94416373-2 |
| Primary OEM — Long | 8944163732 |
| Alternate Format | 8-94416-373-2 |
| Related Crankshaft — 4BC2 | 5123101610 |
| Related Crankshaft — 4BD1 | 5123101630 |
| Related Crankshaft — 4BG1 | 8-97112-981-2 |
| Related Crankshaft — 4HF1 | 8-97033-171-2 |
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | ELF 150 | N-Series | 4BE1 | 1990-2024 |
| ISUZU | ELF 250 | N-Series | 4BE1 | 1990-2024 |
| ISUZU | NPR | NPR | 4BE1 | 1990-2024 |
| ISUZU | MU-X | -- | 4BE1 | 1990-2024 |
| ISUZU | N-Series | -- | 4BE1 | 1990-2024 |
- This crankshaft is designed for the 4BE1 3.6L engine family. Confirm your specific engine model and year before ordering.
- The crankshaft journal dimensions are: Eccentric 52.5 mm, Main Journal 76 mm, Connecting Rod Journal 64 mm, Overall Length 648 mm. Verify these dimensions against your original component.
- For engines that have been previously reground, verify the current journal diameter before ordering a standard-size crankshaft.
- For right-hand drive (RHD) vehicles, verify clearance and routing. Refer to the ISUZU workshop manual for the correct procedure.
| Feature | Benefit + Verification Signal |
|---|---|
| Forged Steel Construction | High tensile strength and fatigue resistance for reliable power transmission — verified by material certificate and hardness testing (HRC 45-58). |
| Precision Journal Machining (52.5/76/64/648 mm) | Uniform journal surfaces ensure proper bearing clearance and oil film formation — verified by CMM dimensional inspection. |
| Hardened and Polished Bearing Journals | Superior wear resistance and extended service life under heavy loads — verified by hardness testing and surface roughness inspection. |
| Balanced Counterweights | Reduces vibration and abnormal wear, extending engine life — verified by dynamic balancing equipment. |
| Precision Oil Passages | Ensures proper lubrication to all bearing surfaces — verified by flow testing. |
| ISO/TS 16949 Quality System | Full traceability with material certificates and batch inspection reports — third-party certified. |
| Installation Success Rate ≥ 99% | Based on repair order tracking — confirms reliable fitment across the 4BE1 platform. |
| QC Item | Verification Method / Standard |
|---|---|
| Journal Diameters (52.5/76/64 mm) | CMM, 100% inspection |
| Overall Length (648 mm) | CMM, 100% inspection |
| Journal Roundness & Taper | Roundness tester, 100% inspection |
| Surface Hardness | Rockwell hardness tester (HRC 45-58), batch sampling |
| Dynamic Balance | Dynamic balancing machine, 100% inspection |
| Material Composition | Spectrometer analysis, batch sampling |
| Surface Finish (Ra) | Surface roughness tester, 100% inspection |
| Crack Detection | Magnetic particle inspection (MT), 100% inspection |
| Keyway Dimensions | CMM, 100% inspection |
| Thread Inspection (Flywheel / Pulley) | Thread gauge, 100% inspection |
| Batch Traceability | Material lot number + production date |
| Packaging Protection | Anti-rust oil + VCI film + wooden case |
- Preparation: Remove the engine from the vehicle. Disassemble the engine and remove the old crankshaft. Clean the cylinder block main bearing bores thoroughly.
- Bearing Installation: Install new main bearings into the cylinder block and bearing caps. Apply clean engine oil to all bearing surfaces.
- Crankshaft Installation: Carefully lower the crankshaft into the block. Install the bearing caps in their original positions with the arrows facing the correct direction.
- Torque Sequence: Tighten the crankshaft bearing cap bolts in the numerical order specified in the workshop manual, a little at a time in stages.
- Connecting Rod Installation: Install the connecting rods and pistons. Tighten the connecting rod bearing bolts to specification.
- End Play Check: Measure crankshaft end play with a dial indicator. Ensure it is within the workshop manual specification.
- Rotation Check: Rotate the crankshaft by hand to verify smooth rotation without binding.
- Final Assembly: Install the flywheel, pulley, and other accessories. Torque all fasteners to specification.
- Every 5,000 -10,000 km: Change engine oil and filter. Check oil pressure.
- Every 40,000 -50,000 km: Perform oil analysis to detect bearing wear metals.
- At engine overhaul: Inspect crankshaft journals for wear, scoring, or cracks. Replace if out of specification.
- Whenever bearing failure occurs: Replace the crankshaft if journals are damaged or out of round.
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