That's why I go to machine shops. You also have to check the step on flywheels when you exchange them, as some of them get kicked back out of tolerance.

On the 22Rxx oil pumps, one of the bolts gets sealant put on it when installed. Should be the one left/above the relief valve; it'll leak if you don't give 'er a dab.

On NAPA water pumps, the impellers are pretty wimpy. I just pulled a GMH pump off a block; the vanes very closely match the Aisin pumps. This is the first one I've seen.

FWIW, I've had an Aisin go only 20K on me before it started weeping; a first. That was about a year and a half ago.

This is why I also tell folks to get the following bench checked BEFORE they leave the parts store: alternator, battery load test, starter.

Can't always fix the box stores, but we can all become better consumers. <img src="/forums/images/graemlins/baby.gif" alt="" />