Diaphram Kit w/Buna Seal

The Tilton Diaphragm Kit with Buna Seal (part number 40-902) is a replacement diaphragm assembly engineered for Tilton cooler pump systems. This component is the critical sealing element responsible for regulating coolant flow and maintaining system integrity in high-performance cooling applications. The kit includes the diaphragm and buna rubber seal, both essential for restoring pump function when wear or degradation occurs.

Buna rubber is the standard elastomer material for automotive and motorsports cooling systems due to its resistance to thermal cycling and coolant exposure. The diaphragm itself functions as a flexible valve that responds to pressure differentials within the pump housing, controlling coolant delivery to the engine. When the original diaphragm becomes brittle, cracks, or loses seal integrity—common issues after extended high-heat operation—coolant leakage and reduced flow pressure result. This replacement kit restores the pump to proper operating condition without requiring full pump replacement.

Technicians and engine builders maintaining or rebuilding Tilton cooler pump systems rely on OEM diaphragm kits like this to ensure correct pump calibration and longevity. The kit's compact design—measuring 3.9 x 1 x 4.65 inches and weighing just 0.07 lbs—makes it straightforward to install during routine pump service. Proper diaphragm condition is non-negotiable in applications where precise coolant management prevents overheating and maintains engine performance consistency.