MX-5 Miata L4-2.0L (2008)
Water Pump: Technical Service Bulletins
Cooling System - Small Water Pump Leak Explanation
Bulletin No: 01-004/09
Last Issued: 02/03/2009
Subject:
REPLACEMENT OF WATER PUMP FOR COOLANT LEAK
APPLICABLE MODEL(S)/VINS
2003-2009 Mazda6 (with 2.3L, including Mazdaspeed6)
2004-2005 Mazda Miata
2004-2009 Mazda3 (including Mazdaspeed3)
2006-2009 Mazda5
2006-2009 Mazda MX-5
2007-2009 Mazda CX-7
DESCRIPTION
There is a concern that some water pumps are being replaced that are not faulty, due to signs of a very small coolant leak from the bleed hole. This
Service Bulletin is to inform you about the water pump sealing mechanism and the criteria if replacement is necessary or not.
A mechanical seal is used for the water pump, and this mechanical seal can seal coolant by sliding a mating ring against a seal ring. When the sliding
surface temperature of the mechanical seal is more than 248°F (120°C) while driving, a small amount of steam is leaked and bleeds through the bleeding
hole. After drying, the steam leaves a coolant leak mark on the water pump. This is normal, and the water pump should not be replaced. The water pump
should only be replaced if there is an accumulation of crystallized coolant around the bleed hole.
When you encounter a water pump coolant leak concern, repair the vehicle by referring to the repair procedure.
If you confirm a coolant leak from steam bleeding, explain to the customer that this is normal as explained above.
REPAIR PROCEDURE
