Buy wp20427 - Genuine Cummins Water Pump - wisentpartscenter.com

Description

Genuine Cummins 3800479 Water Pump is a gear-driven, short-shaft coolant pump used on Cummins L10, M11, ISM, and related 11-liter engine applications. The pump circulates coolant through the engine and cooling system so heat can be carried away from the cylinder block and head and released through the radiator.

Key Functions
- Circulates engine coolant continuously while the engine is running.
- Maintains coolant flow through the block, cylinder head, and cooling circuit.
- Uses the engine gear train to drive the pump rather than an external belt.
- Helps maintain stable engine temperature under changing load and operating conditions.

Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

The 3800479 keeps coolant moving through the engine so combustion heat can be transferred into the cooling system and removed at the radiator. Because this pump is driven directly by the engine gear train, bearing, shaft, seal, and impeller condition all affect coolant circulation.

Issue Symptoms / When to Replace

A failing water pump may cause coolant leakage around the pump, overheating under load, abnormal noise from the gear-drive area, or looseness in the pump shaft. Poor coolant circulation can also cause temperature problems even when no external leak is visible. Before replacing the pump, the thermostat, radiator, coolant level, and the rest of the cooling system should also be checked.

Brand Information

Cummins has manufactured diesel engines and engine components since 1919 and supports its heavy-duty engine families with dedicated cooling-system components. This water-pump family was used across Cummins L10, M11, ISM, and related QSM11 applications.

Installation Notes

Disconnect the negative battery cable and allow the engine to cool before service. Clean the mounting surface carefully and use the engine-specific Cummins procedure for fastener torque and cooling-system refill.

How to Identify an OEM Part

The OEM water pump housing has part number molded directly into the metal. This permanent casting is a useful identification point even when the original Cummins packaging or label is no longer available.

Why Buy 3800479 from Wisent Parts

  • ⏱️
    Fast shipping
    Orders before 12PM EST ship same business day.
  • 🛡️
    180-day warranty
    All parts covered from delivery date.
  • ↩️
    Easy returns
    30-day returns.
  • ✅
    Verify fitment
    Send VIN/ESN and we’ll confirm.

Shop with confidence

Warranty & Return Information
Warranty Information

Wisent Parts offers a 180-day warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

Wisent Parts accepts returns within 30 days of delivery. All returns are subject to a restocking fee. To qualify, parts must be unused and in their original condition. For full return instructions and restocking fee details, please refer to the Returns page.