4991305 Cummins Crankshaft Front Oil Seal For 4BT3.9 6BT5.9 Engines

Product Overview:

The Genuine 4991305 is Crankshaft Front Oil Seal for Cummins 6B 6BT5.9/ 4B 4BT3.9. Global mainstream aftermarket part for trucks, construction machinery and generators, favored by overseas repair shops for stable sealing and wide compatibility.

4991305 Crankshaft Front Oil Seal Specification:

Key Features:

✅Double-lip dual function: Blocks oil leakage and prevents dust/sand intrusion into crankcase

✅Stainless steel spring maintains constant lip pressure for long-term reliable sealing

✅Two rubber grades for selection: Standard NBR for regular use, FKM for high-load high-temperature working conditions

✅Integrated steel frame retains shape, eliminates seal deformation after long operation

Application:

✅Commercial Vehicles: Cummins B-series medium trucks, dump trucks, logistics delivery vehicles

✅Construction Machinery: Loaders, excavators, road rollers with QSB5.9 engines

✅Generator Sets: Mobile/stationary industrial diesel generators

✅Agricultural Equipment: Large tractors, harvesters with 4BT/6BT power units

Why  Choose US?

✅Professional China-based Cummins parts supplier

✅Genuine Cummins quality, strict factory inspection

✅Direct factory supply with competitive cost advantage

✅Stable stock & fast global delivery

✅Technical matching support for all B-series engines