Dayco DP1339 Heavy-Duty Engine Water Pump - Cummins 8.3L

The Dayco DP1339 is a heavy-duty, 100% new replacement engine water pump engineered for the Cummins 8.3L diesel engine. Designed to meet or exceed original equipment specifications for fit, form, and function, this pump delivers reliable cooling system performance in demanding commercial and fleet applications.

Key Features:

• Cast Iron Housing – Single-piece construction with no welds for maximum durability and leak resistance
• Case-Hardened Roller Bearings – Hardened exterior with a flexible interior to resist bearing failure under load
• Improved Impeller Design – Optimized blade profile ensures proper coolant flow at all engine speeds while minimizing cavitation
• Low-Friction Unitized Seals – Superior sealing performance prevents coolant from entering the bearing assembly
• 100% End-of-Line Leak Tested – Every unit is pressure-tested before leaving the factory
• Flat-Style Pulley – 4.475 inch (114mm) diameter flat-style pulley for correct belt alignment
• Ready to Install – Direct-fit OE replacement requiring no modifications
• TS16949 Certified Manufacturing – Meets automotive quality management standards

The DP1339 is backed by Dayco's industry-leading 125,000-mile warranty, reflecting the brand's confidence in its materials and engineering. Whether used in commercial trucks, buses, or fleet vehicles powered by the Cummins C-Series 8.3L engine, this water pump provides the dependable cooling performance needed to protect your investment.