Join Date: Jul 2006
Location: Northfield, Illinois
In this case, it is likely that excess outside axial clearance caused the failure. There are 2 axial clearances in these pumps, interrelated. Internally, gear top to upper body flange, and externally, upper body tower bush to bronze gear bottom. There is a build tolerance as mass production of ORIGINAL FACTORY pumps components varied a bit and that was designed into factory clearances. However, too much clearance here allows the bronze gear to move up-and-down against the hardened steel gear, resulting in the hourglass wear-THROUGH seen. I've had many other pumps with soft brass gears that show the beginnings of this wear pattern.
Ed. They have a wider distribution. Our vendors often do not know the quality of aftermarket parts unless failures are reported. They are NOT manufacturers, component testers or engineers. They are trying to fill a demand. This is complicated by good components, used in incorrect applications. A good 2L oil pump for a slower speed FI engine, used in a faster running 1600 with Webers, does not last long. This is an application mis-match, rather than "bad" pump.
All the above, my opinions from my own personal experiences.
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