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Showing results for tags 'shirred bolt head'.
My Water Pump was leaking coolant on my 1998 Boxster, so I decided to replace the water pump gasket. After removing all the components described in Wayne's Technical Article of Water Pump and Thermostat Replacement, I came across one unforgiving bolt on the Water Pump that would not budge. The 10mm flexhead would not grip the very top bolt. I noticed that the pulley for the water pump was almost touching the bolt. On further inspection I found that the pulley had actually shirred the bolt head and and rubbed off 3 of the points of the bolt head making it impossible to take off with the requi