Service Manual

ISB, ISBe and QSB (Common Rail [...] Water Pump
Section 8 - Cooling System - Group 08 Page 8-95
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Initial Check
Inspect the water pump housing for cracks and/or
damage.
Check the water pump seal weep hole. The water pump
seal design requires a coolant film for lubrication and
cooling. Therefore, it is normal to observe a minor
chemical buildup or streaking at the weep hole.
Use the following guidelines to determine if water pump
replacement is necessary:
Make sure the weep hole is open.
NOTE: A small screwdriver or a similar tool can be used
to remove any debris.
If no leakage is observed from the weep hole under
operating conditions, do not replace the water pump.
Preparatory Steps
Automotive and Industrial
WARNING
Batteries can emit explosive gases. To reduce the
possibility of personal injury, always ventilate the
compartment before servicing the batteries. To
reduce the possibility of arcing, remove the negative
(-) battery cable first and attach the negative (-)
battery cable last.
WARNING
Do not remove the pressure cap from a hot engine.
Wait until the coolant temperature is below 50°C
[120°F] before removing the pressure cap. Heated
coolant spray or steam can cause personal injury.
WARNING
Coolant is toxic. Keep away from children and pets. If
not reused, dispose of in accordance with local
environmental regulations.
• Disconnect the batteries. Refer to the OEM service
manual.
• Drain the engine coolant. Refer to Procedure 008-018
in Section 8.
• Remove the cooling fan drive belt. Refer to Procedure
008-002 in Section 8.