Water Pump Gasket 05-21 Hemi 5.7L

The Water Pump Gasket 05-21 Hemi 5.7L is a critical engine seal engineered for Dodge and Chrysler vehicles equipped with the legendary Hemi 5.7-liter platform. This gasket sits at the interface between your water pump housing and engine block, preventing coolant leakage that can lead to overheating, cavitation damage, and catastrophic engine failure. Whether you're performing routine maintenance on a high-mileage truck or rebuilding after a cooling system failure, this OEM-equivalent gasket is non-negotiable for system integrity.

Manufactured by MAHLE ORIGINAL under the CLEVITE banner, this gasket (MPN K31777) meets or exceeds OEM specifications for the 2005–2021 Hemi 5.7L application. The gasket material is engineered to withstand sustained operating temperatures, pressure cycling, and the aggressive thermal gradients inherent to modern V8 combustion. At just 0.125 lbs and compact dimensions (8.9 x 0.9 x 13.6 inches), it fits precisely within the water pump cavity, delivering a reliable static seal that prevents bypass paths and maintains proper coolant circulation throughout the block and cylinder heads.

This gasket is essential for any Hemi 5.7L owner replacing the water pump—whether on a Ram truck, Dodge Charger, or Chrysler 300—or addressing a known coolant weep at the pump mounting surface. Installation requires draining the coolant system and removing the water pump; careful surface preparation of the block and pump housing ensures optimal sealing performance and eliminates the risk of premature failure. Pairing this MAHLE gasket with fresh coolant and a quality water pump assembly guarantees years of reliable thermal management on your Hemi engine.