C9 Urban Transit Bus Engine Caterpillar

Overconcentration of coolant additive (conditioner), mineral deposits from hard water, or cooling system contamination can accelerate the wear on the water pump seal.

Replace the Water Pump Seal, If Necessary

Inspect the water pump for leaks. The water pump seal is lubricated by coolant in the cooling system. It is normal for a small amount of leakage to occur as the engine cools down and the parts contract.

Removal and Installation

Refer to the Service Manual for more information on the removal and installation of the water pump, or consult your Caterpillar dealer for assistance.

Inspect the Bearing for the Water Pump Pulley

Show/hide table

Engine surfaces and fluids can be hot. A running engine will have moving belts exposed at the front of the engine (rear of bus). These hazards can result in personal injury or death. stop the engine while connecting test equipment and work carefully around a running engine. Do not allow tools or test equipment to protrude or vibrate into the path of rotating belts.

Inspect the water pump pulley for unusual noise, excessive looseness and/or vibration of the bearings.

Refer to the Service Manual for more information on the removal and installation of the water pump pulley, or consult your Caterpillar dealer for assistance.