4935793 Water pump for Cummins B3.9L B5.9L 4B 4BT 4BTA 6B 6BT 6BTA

The Cummins 4935793 Water Pump is a genuine OEM coolant pump designed for multiple Cummins B-series engines, including industrial, automotive, and marine applications. Here’s a detailed breakdown:

Key Specifications

• Application:

  • B3.9L (4B, 4BT, 4BTA)

  • B5.9L (6B, 6BT, 6BTA)

• Type: Centrifugal, gear-driven (timing gear)

• Material: Cast iron housing, carbon ceramic seal

• Rotation: Counter-clockwise (viewed from pulley side)

• Pulley Mount: 4-bolt flange (V-belt or serpentine compatible)

Compatibility Details

Fits These Engine Codes:

Exclusions:

• ISB 5.9L (1998.5+) – Uses different pump (e.g., 3945324)

• QSB6.7L – Larger housing/outlet

Critical Installation Notes

1. Torque Values:

   • Mounting bolts: 45 Nm (33 lb-ft)

   • Pulley bolts: 27 Nm (20 lb-ft)

2. Sealing:

   • Use Cummins-approved RTV sealant (e.g., Loctite 518) on gasket surfaces.

3. Break-In:

   • Run engine at idle for 10 minutes to seat the seal.

Cross-Reference Alternatives

Warning

⚠ Do NOT use with:

• Ethylene glycol coolants mixed with DCA4 additives (can damage seal).

• Aftermarket pulleys with incorrect offset.

⚠ Failure Signs:

• Coolant weep hole leakage (indicates seal failure).

• Bearing noise (growling at idle).

Maintenance Interval

• Replace every 100,000 miles or 6 years (whichever comes first).

• Inspect annually for bearing play/seepage.