Maintenance script: Imported from text file

2018-04-05T21:59:42Z

Imported from text file

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The '''Water Pump''' is an vital component of the [[Cooling System|cooling system]]. It causes coolant to circulate throughout the cooling system. [[File:4335l.jpg|frameless|alt=4335l.jpg]] 
==Function==
The water pump is mounted to the front of the engine block. Its pulley holds the [[Cooling Fan|cooling fan]] and [[Fan Clutch|fan clutch]] and is driven by drive belt. As it rotates, its impeller spins to pull coolant through the [[Thermostat Housing|thermostat housing]] and into the engine block, where is is then circulated through the block, heads, heater core, and other [[Cooling System|cooling system]] components. 
==Failures==
The water pump is a durable component, and while it should be replaced every 60,000 miles as part of maintenance, it is not impossible for it to fail at other times from other causes. Non-Nissan water pumps, for example, are especially notorious for premature failure. Some of the ways the water pump can fail are... 

* Worn bearings, causing play in the shaft and leakage.
* Worn seals, causing leakage (seen through a weep hole on the water pump housing).
* Broken housing, caused by over-tightening of its drive belt.
* Eroded impeller blades, caused by the use of tap water through the cooling system, or extended periods of inactivity.
[[File:photo_3_(4).jpg|alt=photo_3_(4).jpg|thumb|A water pump which sat long enough for the impeller blades to erode (right) compared to a good water pump (left).]]
 
==Replacement==
The water pump should be replaced as part of the 60,000 or 120,000 mile maintenance procedure. For more information, see the [[Timing Belt Service]] article. 

[[Category:Parts]][[Category:Cooling System]]

Water Pump - Revision history

Maintenance script: Imported from text file