The cooling system maintains Cummins engine operating temperature within a controlled range, preventing overheating under load and ensuring efficient combustion. Key components include the water pump, thermostat, radiator, water transfer tubes, coolant hoses, and the coolant passages within the cylinder block and heads. The thermostat regulates coolant flow between the engine and radiator based on temperature, while the water pump provides circulation pressure. Cooling system failures — such as a stuck thermostat, leaking water tube, or worn water pump — can quickly lead to overheating, which risks serious engine damage including cracked cylinder heads or seized pistons.
AMS Parts supplies a wide range of cooling system components for Cummins engines used in power generation, marine, and industrial applications. Browse a selection of available parts below, or contact us for specific requirements.
Below is a selection of cooling system parts we supply. Use the search bar above to find a specific part number, or request a quote. You can also reach us directly at [email protected] or +44 7776 800169.
Cummins recommends using a coolant that meets their specification (typically Cummins Fleetguard ES Compleat or equivalent meeting TMC RP-329 or ASTM D6210). Using incorrect coolant chemistry can lead to liner pitting, corrosion, or water pump seal failure. Always check the engine operation manual for the specific recommendation.
A stuck-closed thermostat will cause overheating. A stuck-open thermostat will cause the engine to run below normal operating temperature, resulting in poor fuel economy and increased emissions. If the engine consistently runs hot or cold regardless of load, the thermostat should be tested or replaced.
Common causes include low coolant level, a faulty thermostat, a failing water pump, blocked radiator fins, a collapsed coolant hose, or a failed fan clutch. A systematic check starting with coolant level and working through each component in the circuit is the standard diagnostic approach.
