A water pump is used to circulate coolant throughout the
and heater systems.
The water pump is driven by the engine via
in most cases.
When a water pump fails it can produce a
or rattling sound
. Also, a water
pump can leak engine coolant through a relief port that allows coolant to pass when
the shaft seal fails. This port is created so
will not contaminate the shaft bearings causing a worse problem.
If a failing or failed water pump is allowed to operate it can cause the
engine to overheat
completely fall apart causing cooling system or other internal engine damage. The
water pump circulates coolant continuously, a
is used to control
the rate of coolant flow through the cooling system . A water pump is comprised
of a main housing body, flange, main shaft, bearings, impeller, seals and a gasket
to seal in against the block.
Water Pump (appearance will vary)
When engine RPM increases so does the water pump flow rate. A water pump will
typically last between 60,000 and 100,000 miles. When replacing a water pump always
insist on high quality replacement parts to avoid premature failure. To check your
water pump condition, make sure the engine is off, next grab a hold of water pump
flange and try to move it back and forth. There should be little to no play in the
main shaft bearing. If excessive play exists the water pump has failed and needs
replacement. Some engine designs have the water pump driven by the engine's
or chain. When this
style of water pump design fails it can cause engine coolant to enter the crankcase.
This situation can be bad because the engine oil is compromised and can cause the
engine to fail from reduced lubrication. The water pump is responsible for supplying coolant to the
for proper heater operation.
If the water pump impeller is defective it can cause the engine to overheat and cause poor heater performance.Replacement Guide Outline
- Set of sockets and socket wrench with extensions
- Phillips and standard screw drivers
- Gasket scrapper
- Wrench set
- Gasket sealer (optional)
- Start with engine cold, drain coolant
- Remove serpentine drive belt
- Remove all accessories to access water pump mounting bolts, remove water
- Using a gasket scrapper remove all of the old gasket and clean surfaces
- Install new water pump with sealing gasket and tighten evenly
- Reassemble as needed
- Refill cooling system with coolant and and water mix, then start engine, refill system as the
engine warms up
- Recheck coolant level after the engine has cooled
NOTE: Check for coolant leaks after the job is completed and repair as needed.Related Replacement Components:Basic Checks
Low levels of coolant can lead to problems related to engine overheating. Always
maintain proper levels of coolant in the overflow coolant reservoir tank. ONLY!
Check the radiator when the engine is cold. Only add antifreeze and re install the
cap properly. Always drain and refill your cooling system regularly. If further
technical assistance is needed, ask our team of certified
car repair technicians
.Related Car Repair Information
Article first published 2009-08-25 (Updated 2013-11-19)