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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 reciproing 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 reciproing 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 reciproion.
Lubriion & Cooling: The connecting rod features internal oil passages for lubriing the piston pin and big-end bearing via splash or pressure lubriion.
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.
Appliion Range: Fits ISUZU NKR, NHR, NQR, ELF trucks, and EC55B, DH55 construction equipment.
Brand Certifiion: Supplied by IZUMI brand, ISO/TS16949 certified.
Condition:Brand New — 100% quality inspected.
Warranty:3 months.
Delivery Time:15–20 days after deposit.
Product Specifiions
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 Appliions:
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 Appliions:
Brand
Equipment Model
Compatible Engine
Notes
ISUZU
EC55B
4JB1
Excavator
ISUZU
DH55
4JB1
Excavator
Primary Engine Appliions:
Engine Model
Type
Primary Appliion
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 specifiions.
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 appliions.
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.
Flexible MOQ with small quantity orders accepted — delivery time 15–20 days.
Quality Control & Verifiion
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 certifiion 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.
Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...
