Isuzu 4JB1 Engine Flywheel Gear Ring 8944684120 108T High-Quality Starter Gear Ring Replacement Part
This product is the Isuzu 4JB1 diesel engine flywheel gear ring (OEM: 8944684120), suitable for the
4JB1 engine starting system. Installed on the outer ring of the flywheel, it meshes with the starter gear to transmit starting torque, ensuring smooth engine starting. It is widely used in the repair and overhaul of engines in construction machinery and commercial vehicles, suitable for flywheel gear ring replacement, repair of starting abnormalities, and repair of starter meshing faults.
4JB1 Engine Flywheel Gear Ring
| Product Name |
Engine Flywheel Gear Ring |
| Part Number |
8944684120 |
| Number of Teeth |
108 |
| Minimum Order Quantity |
1 piece |
| Payment Method |
Western Union, T/T |
| Shipping Method |
UPS/DHL/EMS/TNT/FedEx |
Applicable Engines: 4JB1, 4BD1, 4BE1, 4BG1, 4BG1-BCVP, UM4BG1
Applications: Construction machinery, excavators, loaders, trucks
Features and Advantages
High-strength alloy steel material, strong impact resistance
Precision tooth profile machining ensures smooth starting engagement
Heat treatment strengthens, extending service life
High compatibility with original flywheels, no installation modifications required
Superior wear resistance compared to ordinary cast steel parts

4JB1 Diesel Engine Flywheel Gear Ring 8944684120 108-tooth complete set in stock
Guangzhou Minshun Machinery Equipment Co., Ltd.
We specialize in the sales and service of diesel engine assemblies and construction machinery parts. Our product line covers engine assemblies, filtration systems, electronic control components, hardware accessories, wiring harnesses, and electrical accessories. Our service area includes Canada, the United States, the United Kingdom, Mexico, the Netherlands, Kazakhstan, Mongolia, Russia, Australia, Malaysia, Turkey, Indonesia, Singapore, Thailand, South America, South Africa, and other countries and regions.
Our Product Range
| Engine Rebuild Kit |
Turbochargers |
Engine Diesel Pumps |
Engine Controllers (ECU) |
| Cylinder Blocks |
Cylinder Heads |
Water Pumps |
Injectors |
| Starter Motors |
Filters |
Other Engine Accessories |
Excavator Hydraulic Pumps |
| Swivel Components |
Distributor Valves |
Travel Motor Assemblies |
Chassis Components and Other Accessories |


Frequently Asked Questions
Q1: What is your main products?
A1: We are specialized in the excavator engine spare parts, for example Main cylinder block, cylinder head, crankshaft, Engine assembly, piston, cylinder liner, piston ring, camshaft, connecting rod, oil pump, water pump, valve series products, movement, etc. almost all parts of the entire engine.
Q2: Do you test all products before shipping?
A2: Yes, we conduct 100% testing before shipping.
Q3: Which engine models is this Engine Flywheel Gear Ring compatible with?
A3: This product is designed for specific diesel engine models. If you can provide the engine model or original part number, we can confirm compatibility before shipping to avoid incompatibility issues.
Q4: Can you provide cross-reference information for OEM part numbers?
A4: Yes, we support original part interchange. Please provide the original part number, and we will verify the replacement part accordingly.
Q5: What should I do if there is a problem with the product?
A5: Our products undergo professional testing and are of very stable quality. If you do find any problems, please contact us. We have a professional after-sales team to help you solve the problem.
Q6: When should the engine flywheel ring gear be replaced?
A6: It is recommended to replace the flywheel ring gear promptly when the following conditions occur:
Gear grinding occurs during startup, or the engine fails to start smoothly.
Localized wear, missing teeth, or broken teeth on the ring gear.
Frequent idling by the starter motor, failing to properly engage the flywheel ring gear.
Difficulty starting in cold conditions, accompanied by abnormal noise or metallic friction sounds.
The flywheel ring gear is manufactured using high-strength steel and heat treatment processes. Under normal circumstances, it can operate stably for a long time. However, under prolonged high loads or abnormal starter motor conditions, wear or damage to the ring gear may still occur, and it should be inspected and replaced promptly.
Why Choose Us?
• Over 20 years of focus on construction machinery – offering a full range of excavator assemblies and accessories.
• Get a Quote – Our professional team will provide you with a quote immediately upon receiving your requirements.