6.7L Cummins Cooling System – Water Pump – Initial Check

Inspect the water pump housing for cracks and or other 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.
NOTE: A streak or chemical buildup at the weep hole is not justification for water pump replacement.
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.