ISUZU Forged Alloy Steel Heat-treated Connecting Rod OEM Standard for 4JB1 4JB1T Engine
Basic Properties
Place of Origin:
CHINA
Brand Name:
YIMI
Certification:
ISO/TS16949
Model Number:
4JB1 4JB1T
Trading Properties
Minimum Order Quantity:
20 PCS
Price:
Negotiable
Payment Terms:
T/T
Supply Ability:
10000 pcs/month
Specifications
| Surface Treatment: | Heat-treated | Material: | Forged Alloy Steel |
| OEM Part Number: | 8-94338648-0 / 8943386480 | Installation Position: | Inside Engine Cylinder Block / Between Piston And Crankshaft |
| Part Type: | Engine Moving Component | Compatible Engines: | ISUZU 4JB1, 4JB1T |
| Compatible Equipment: | ISUZU EC55B, DH55 | Compatible Models: | ISUZU NKR, NKR55, NHR, NQR, ELF Series |
| High Light: | Forged Alloy Steel Connecting Rod,Heat-treated Con Rod,OEM Standard Engine Connecting Rod |
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Product Description
ISUZU Connecting Rod 8-94338648-0 8943386480 for 4JB1 4JB1T Engine — Forged Steel OEM Standard
Product Overview
ISUZU Connecting Rod with OEM numbers 8-94338648-0 / 8943386480 is a precision-engineered replacement designed for ISUZU 4JB1 and 4JB1T diesel engines. This component is a core moving part of the engine — the Connecting Rod Assembly — responsible for converting the reciprocating motion of the piston into the rotational motion of the crankshaft.
Numbering Note: This product number is 8-94338648-0 / 8943386480, also listed as 894338-6480. This product also fits EC55B and DH55 construction equipment. Please verify the specific number based on actual vehicle or equipment configuration.
Working Principle
The connecting rod is a critical component connecting the piston to the crankshaft, installed inside the engine cylinder block. Its working principle includes:
- Power Transmission: During the engine's power stroke, combustion pressure pushes the piston downward, converting reciprocating motion into rotational motion through the connecting rod.
- Force Conversion: The connecting rod withstands complex alternating loads — including compressive and tensile forces from combustion pressure, and inertial forces from piston reciprocation.
- Lubrication & Cooling: The connecting rod features internal oil passages for lubricating the piston pin and big-end bearing via splash or pressure lubrication.
- Balance Function: The connecting rod, together with the crankshaft and piston, forms the engine's motion system — its mass and rigidity directly affect engine smoothness.
Failure Symptoms
Inspect immediately if any of these occur:
| Symptom | Probable Cause |
|---|---|
| Heavy "knocking" sound from engine (connecting rod bearing noise) | Worn big-end bearing or excessive clearance |
| Severe engine vibration; rough operation | Bent or broken connecting rod; loss of balance |
| Consistently low oil pressure | Worn connecting rod bearings causing increased oil leakage |
| Engine suddenly stalls or fails to start | Broken connecting rod; severe internal engine damage |
| Bent, twisted, or cracked connecting rod found during engine disassembly | Long-term overloading or material fatigue |
Verifiable Data
- Material Standard: Manufactured from High-Strength Forged Alloy Steel with heat treatment — ensures excellent fatigue resistance and durability.
- Precision Machined: Precision-machined to tight tolerances — ensures smooth piston motion and engine efficiency.
- Compatibility Verified: Fits both 4JB1 naturally aspirated and 4JB1T turbocharged engines.
- Application Range: Fits ISUZU NKR, NHR, NQR, ELF trucks, and EC55B, DH55 construction equipment.
- OE Cross-Reference Verified: Replaces OEM numbers 8-94338648-0 / 8943386480.
- Brand Certification: Supplied by IZUMI brand, ISO/TS16949 certified.
- Condition: Brand New — 100% quality inspected.
- Warranty: 3 months.
- Delivery Time: 15–20 days after deposit.
Product Specifications
| Part Number: | 8-94338648-0 8943386480 | Product Name: | Connecting Rod |
| Car Model: | 4JB1 4JB1T | Engine Model: | 4JB1 4JB1T |
| Condition: | 100% Brand New | Size: | Standard |
| Weight: | Standard | Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe | ||
| Package: | Neutral Packing Or Make It As Requested | ||
| Material: | High-strength aluminum alloy & precision bearings | Cooling Type: | Engine coolant circulation |
| Installation: | Direct OEM replacement | Quality Standard: | OEM equivalent / ISO quality control |
Vehicle & Engine Compatibility
Primary Vehicle Applications:
| Brand | Model Series | Chassis | Compatible Engine | Notes |
|---|---|---|---|---|
| ISUZU | NKR | NKR55 | 4JB1 / 4JB1T | Light-duty truck |
| ISUZU | NHR | — | 4JB1 / 4JB1T | Light-duty truck |
| ISUZU | NQR | — | 4JB1 / 4JB1T | Medium-duty truck |
| ISUZU | ELF | — | 4JB1 / 4JB1T | Light-duty truck |
Extended Equipment Applications:
| Brand | Equipment Model | Compatible Engine | Notes |
|---|---|---|---|
| ISUZU | EC55B | 4JB1 | Excavator |
| ISUZU | DH55 | 4JB1 | Excavator |
Primary Engine Applications:
| Engine Model | Type | Primary Application |
|---|---|---|
| ISUZU 4JB1 | Naturally Aspirated | NKR / NHR / NQR / ELF series |
| ISUZU 4JB1T | Turbocharged | NKR / NHR / NQR / ELF series |
Important Fitment Warnings
- Number Confirmation: This product number is 8-94338648-0 / 8943386480. Verify the specific number on the original part before ordering.
- Set Replacement Recommended: Connecting rods should be replaced in sets (4 pieces) to maintain engine balance and consistency.
- Associated Components: When replacing connecting rods, it is recommended to also replace connecting rod bearings, piston pins, and piston rings.
- Installation Torque: Refer to ISUZU 4JB1 engine factory workshop manual for connecting rod bolt torque specifications.
- Installation Orientation: Connecting rods have orientation marks — pay attention during installation.
- Professional Installation: Connecting rod replacement is a core engine overhaul procedure requiring complete engine disassembly and reassembly. Must be performed by a qualified engine repair technician.
Features & Benefits
High-Strength Forged Alloy Steel Construction
Excellent fatigue strength and durability for long-term reliable operation under high-compression, high-load conditions— suitable for 4JB1/4JB1T engines and NKR/NHR truck applications.
Precision Machining & Tight Tolerance Control
Ensures smooth piston motion and engine efficiency — provides the perfect balance of strength, weight, and performance.
Heat-Treated for Fatigue Resistance
Significantly enhances fatigue resistance and service life — suitable for both naturally aspirated and turbocharged engines.
100% Factory Quality Inspection
Every piece undergoes strict quality inspection — ensures zero-defect delivery.
ISO/TS16949 Quality Management Certified
Internationally recognized automotive industry quality standard ensuring full-process quality control — supplied by IZUMI brand.
Broad OEM Cross-Compatibility
Replaces OEM numbers 8-94338648-0 / 8943386480 — fits NKR, NHR, NQR, ELF trucks and EC55B, DH55 equipment.
Flexible Supply (Small Orders Accepted)
Flexible MOQ with small quantity orders accepted — delivery time 15–20 days.
Quality Control & Verification
| QC Item | Inspection Method | Acceptance Criterion | Frequency |
|---|---|---|---|
| Connecting rod dimensional accuracy | CMM | OEM standard size ± tolerance | Batch sampling |
| Connecting rod weight | Precision scale | Standard weight ± tolerance | Batch sampling |
| Connecting rod parallelism/twist | Special gauges | Per ISO standard | Batch sampling |
| Material composition | Spectrometer | Per forged steel standard | Batch sampling |
| Material hardness | Rockwell/Brinell tester | Standard hardness range | Batch sampling |
| Visual inspection | Visual / Fluorescent penetrant | No cracks, casting defects, or burrs | 100% |
| ISO/TS16949 quality audit | Third-party certification body | Per ISO/TS16949 standard | Periodic audit |
Installation & Maintenance Recommendations
IMPORTANT SAFETY NOTICE: Connecting rod replacement is a core engine overhaul procedure requiring complete engine disassembly and reassembly. Must be performed by a qualified engine repair technician. Improper operation may cause serious engine damage or safety incidents.
Installation Guidelines (Reference Workshop Manual):
Preparation:
- Confirm engine model (4JB1 / 4JB1T) and part number (8-94338648-0)
- Prepare tools: Torque wrench, micrometer, connecting rod bolt installation tool
- Recommended to also prepare: Connecting rod bearings, piston pins, piston rings, cylinder head gasket
Removing Old Connecting Rods (Reference Steps):
- Remove the engine from the vehicle/equipment and place on an engine repair stand.
- Remove cylinder head and oil pan.
- Remove piston-connecting rod assemblies, mark each connecting rod with its cylinder number and orientation.
- Use a special tool to remove piston pins and separate pistons from connecting rods.
- Inspect old connecting rods for bending, twisting, or cracking.
Installing New Connecting Rods (Installation Sequence):
- Inspect new connecting rods: Check for casting defects, burrs, or cracks.
- Install piston: Install piston pin through piston and connecting rod small end; install snap rings.
- Install connecting rod bearings: Install bearings into the big end, noting orientation.
- Lubricate: Apply engine oil to bearings and piston pin surfaces.
- Install piston-connecting rod assembly: Install into the corresponding cylinder, noting orientation and marks.
- Install connecting rod cap: Install cap and torque bolts to specification (refer to ISUZU 4JB1 workshop manual).
- Check crankshaft rotation: Rotate manually — confirm smooth operation, no binding.
Post-Installation Checks (Mandatory):
- Rotation check: Rotate crankshaft manually — confirm smooth operation, no binding.
- Compression test: Perform compression test before starting — confirm even and standard cylinder pressures.
- Startup test: Start engine; check for abnormal noise.
Maintenance Schedule:
| Item | Interval | Notes |
|---|---|---|
| Oil and oil filter change | Every 5,000～10,000 km | Use API-standard diesel engine oil |
| Engine noise inspection | Each service | Inspect immediately if knocking detected |
| Connecting rod inspection | During engine overhaul | Check for bending, twisting, or cracking |
| Connecting rod replacement | During engine overhaul | Replace in sets (4 pieces) |
Packaging & Supply
| Packaging | Neutral box / Color box / Custom brand packaging |
| Quantity per package | 1 pc/box (standard shipment packaging) |
| Brand | IZUMI |
| Place of Origin | China |
| Customization Options | OEM custom packaging / neutral packaging / private labeling |
| Minimum Order Quantity | Small quantities accepted |
| Delivery Time | 15–20 days after deposit |
| Warranty | 3 months |
| Target Customers | Truck parts wholesalers, engine overhaul shops, construction equipment parts suppliers, fleet purchasers, export traders |
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