Cooling System Description

The cooling system maintains engine temperature at an efficient level during all engine operating conditions.

A thermostat controls coolant circulation. The thermostat remains closed until the engine reaches normal operating temperature. When the engine is cold, coolant does not circulate through the radiator. This allows for faster engine warm-up. When the engine reaches normal operating temperature, the thermostat opens, and the coolant circulates through the radiator in order to keep the engine from overheating.

Remove the surge tank pressure cap in order to add coolant.

The left hand cylinder head intake camshaft extends outside the left hand cam cover providing drive mechanism for the coolant pump. A removable one piece lip seal prevents oil leakage around the camshaft. A drive pulley is pressed onto the end of the camshaft and provides drive for the engine coolant pump using a small multi rib drive belt and tensioner mechanism. The coolant pump assembly is located inside the water crossover casting. The water crossover distributes coolant to the cylinder block and collects it from the cylinder head for delivery to the radiator. The water crossover also provides important functions for the EGR System.