Importance

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Abstract

A cooling system for a liquid-cooled engine, comprises a cylinder head water jacket, a cylinder block water jacket, a water pump, a radiator thermostat for restricting circulation of cooling water through a radiator when the engine is cold, a first return passage for returning coolant coming from a cylinder head water jacket to a pump inlet, and a second return passage for returning coolant coming from a cylinder block water jacket to the pump inlet. The second return passage joins the first return passage at a junction so that a flow of coolant coming from the cylinder block water jacket joins a flow of coolant coming from the cylinder head water jacket. A thermostatic valve is disposed in the junction of the first and second return passages and has a thermosensitive portion exposed to the first return passage for establishing fluid communication between the second return passage and the first return passage depending on the coolant temperature of the first return passage.

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First Claim