Product Descreiption
1. Specifications
- Part Number: 3925343 (QSC series)
- Kit Contents: Double‑lip oil seal + wear sleeve
- Material: Nitrile rubber (NBR) with steel reinforcement
- Weight: ~0.46 lbs (0.21 kg)
- Compatibility: Cummins QSC/ISC 8.3L, 6B5.9L, 4B3.9L engines
- Temperature Range: -40°F to +400°F (-40°C to +204°C)
2. Installation Location
- Position: Engine front (crankshaft drive end), behind the crankshaft pulley/vibration damper and inside the timing cover.
- Installation: Press‑fit into the front cover bore; the wear sleeve installs on the crankshaft nose to provide a smooth sealing surface.
3. Function
- Oil Retention: Seals engine oil inside the crankcase, preventing leaks at the rotating crankshaft interface.
- Contamination Exclusion: Blocks dust, dirt, and moisture from entering the engine, protecting internal components and lubricant quality.
- Dynamic Sealing: The double‑lip design maintains a tight seal while allowing the crankshaft to rotate at high speeds。
