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ISUZU Timing Belt 8-94380679-0 8943806790 for NKR55 4JB1 — 119 Teeth 32mm Width OEM Standard
ISUZU Timing Belt 8-94380679-0 8943806790 Compatible with NKR55 4JB1 Diesel Engine — 119 Teeth Trapezoidal Tooth Profile OEM Standard Replacement
Product Overview
The ISUZU Timing Belt with OEM numbers 8-94380679-0 / 8943806790 is a precision-engineered replacement designed for ISUZU 4JB1 series diesel engines, widely used in NKR55 light-duty trucks. This component is a core part of the engine's valve train — the Timing Belt — responsible for driving the camshaft in precise synchronization with the crankshaft, ensuring intake and exhaust valves open and close at the correct times.
Numbering Note: This product number is 8-94380679-0 / 8943806790, also listed as 8-94380679-SXF. Same series includes 8-94380679-0S1, 8-94419856-0 and other numbers. Please verify the specific number based on actual vehicle configuration.
Working Principle
The timing belt is a critical drive component of the engine's valve train, installed between the crankshaft timing gear and the camshaft timing gear. Its working principle includes:
Synchronous Drive: The timing belt's tooth profile precisely meshes with the timing gears, ensuring strict synchronization between the crankshaft and camshaft (2 crankshaft rotations = 1 camshaft rotation).
Valve Control: Driven by the timing belt, the camshaft opens and closes intake and exhaust valves at precisely timed intervals, ensuring proper air intake and exhaust.
Accessory Drive: On some models, the timing belt also drives the injection pump (diesel) or balance shaft.
Quiet Operation: The toothed belt design provides lower operating noise compared to chain drives, improving driving comfort.
Failure Symptoms
Inspect immediately if any of these occur:
Symptom
Probable Cause
Hard starting or engine won't start
Broken timing belt; loss of valve-piston synchronization
Rough idle or poor acceleration
Timing belt jumped a tooth; valve timing off
Abnormal "ticking" noise from engine
Insufficient belt tension; belt slapping against cover
Visual inspection shows cracks, wear, or damaged teeth
Belt reached service life; rubber aging
Engine suddenly stalls and won't restart
Broken timing belt causing valve-piston interference; severe engine damage
Technical Specifiions
Tooth Count:119 teeth
Width:32mm
Tooth Profile:Trapezoidal (Square) Tooth Profile
Length:1133mm
Material Standard:Neoprene + Fiberglass/Aramid fiber reinforcement
OE Cross-Reference:8-94380679-0 / 8943806790
Brand Certifiion:BZLP, ISO/TS16949 certified
Condition:Brand New
Warranty:1 year
Product Details
Part Number:
8-94380679-0 8943806790
Product Name:
Timing Belt
Car Model:
NKR55
Engine Model:
4JB1
Condition:
100% Brand New
Origin:
China Mainland
Main Market:
Middle East, Asia, Africa, South America, North America & Europe
Package:
Neutral Packing Or Make It As Requested
Vehicle & Engine Compatibility
Primary Vehicle Appliions:
Brand
Model Series
Chassis
Compatible Engine
ISUZU
NKR55
NKR55
4JB1
ISUZU
NKR
NKR
4JB1
ISUZU
NHR
NHR
4JB1
ISUZU
ELF
—
4JB1
Important Fitment Warnings:
Number Confirmation: This product number is 8-94380679-0 / 8943806790. Also listed as 8-94380679-SXF, 8943806790S1, 94380679. Verify the specific number on the original part before ordering.
Associated Components: When replacing the timing belt, it is recommended to replace the tensioner pulley and idler pulley simultaneously for overall valve train reliability.
Timing Marks:Strictly align crankshaft and camshaft timing marks during installation. After installation, rotate the crankshaft two full turns and confirm timing marks are still aligned.
Replacement Interval: Timing belts should be replaced every 80,000～100,000 km or 5 years (whichever comes first) — even if the belt looks intact.
Professional Installation: The timing belt is a critical valve train component — improper installation may cause valve-piston interference and severe engine damage. Must be performed by a qualified engine repair technician.
Features & Benefits
119-Tooth Precision Design
Ensures precise crankshaft-camshaft synchronization for accurate valve timing — verified to match 4JB1 engine original specifiions.
32mm Width + 1133mm Length
Provides ample load capacity and precise length match — ensures stable, slip-free transmission across the full engine RPM range.
Trapezoidal (Square) Tooth Profile
Perfect mesh with 4JB1 engine timing gears — 4JB1 engines use square-tooth timing belts, ensuring precise and reliable drive.
High-Quality Neoprene + Fiber Reinforcement
Excellent oil resistance, heat resistance, and tensile strength for long-term reliable operation under high-temperature, high-speed conditions — prevents belt stretch and breakage.
ISO/TS16949 Quality Management Certified
Internationally recognized automotive industry quality standard ensuring full-process quality control — supplied by BZLP brand.
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 ...
