Water Pump - Subaru LEGACY 2002 Quick Reference Index

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3. Water Pump

The water pump is fitted in a housing formed in the rear chain cover using an O-ring as a seal be-

tween the pump case and the housing. The pump is driven by the timing chain through a sprocket

and rotation of the impeller in a volute chamber creates flow of coolant toward the cylinder block.

The pump case is made of aluminum die casting and the impeller is made of steel sheet. The im-

peller shaft is supported by a ball bearing and a roller bearing. Its end exposed to coolant is sealed

by a mechanical seal and the other end exposed to engine oil is sealed by an oil seal.

The volute chamber is formed by the rear chain cover and the upper oil pan. A metal gasket is

used at the joint between the chain cover and upper oil pan.

(1) Pump case

(2) Ball bearing

(3) Mechanical seal

(4) Impeller

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