Product Descreiption
1. Basic Parameters
- Part Number: 3991123 (cross-reference: 4941464)
- Brand: Cummins
- Applicable Engines: QSL8.9, ISL8.9, 6L, ISC8.3, 6CT series diesel engines
- Type: Gear-driven lubrication oil pump
- Material: Cast iron body + steel gears
- Weight: Approx. 7.0 lb (3.18 kg)
- 2. Installation Position
- Location: Mounted on the lower left side of the engine cylinder block, above the oil pan.
- Drive Connection: Driven directly by the crankshaft timing gear via its drive gear.
- Oil Circuit: Inlet connected to the oil pan suction tube; outlet connected to the engine main oil gallery.
- 3. Main Functions
- Pressure Lubrication: Draws oil from the oil pan, pressurizes it, and delivers it to critical moving parts (crankshaft, camshaft, bearings, gears) to form an oil film and reduce friction and wear.
- Heat Dissipation: Circulates oil to absorb and carry away heat generated by engine friction, assisting in engine cooling.
- Cleaning: Flushes metal debris and impurities from friction surfaces, carrying them to the oil filter for removal.
- Pressure Maintenance: Maintains stable oil pressure in the lubrication system to ensure reliable lubrication under all operating conditions。
