Product Descreiption
1. Specifications
- Part Number: 3918777 (also known as K3918777, J918777)
- Engine Fitment: Cummins 6C8.3L / 6CT8.3 / QSL9 / ISC / ISL diesel engines
- Material: High-strength steel (for durability and wear resistance)
- Weight: ~8.65 lbs (3.92 kg)
- Gear Teeth: Precision-machined, 2:1 gear ratio (camshaft to crankshaft)
- Sleeve Flange Diameter: 5.235″
- Application: 6-cylinder, turbocharged, aftercooled diesel engines
2. Installation Position
- Location: Mounted on the front end of the camshaft (inside the engine timing gear housing)
- Meshing: Directly meshes with the crankshaft timing gear (driven by the crankshaft)
- Installation:
- Heated to 235°C (450°F) for 1–6 hours for easy fitting
- Press-fitted onto the camshaft with a woodruff key (for timing alignment)
- Secured with a thrust plate (groove faces the gear)
3. Function
- Timing Transmission: Transmits rotational motion from the crankshaft (2:1 ratio) to the camshaft
- Valve Operation: Drives the camshaft to open/close intake/exhaust valves at the correct timing
- Engine Synchronization: Ensures precise coordination between piston movement and valve operation
- Durability: High-strength steel construction withstands high torque and engine vibration
