Vacuum pump bearing: loose or tight?

[indybenz]

So I bought a used ebay vacuum pump for the OM617. Then I removed my original pump. Turns out, it may have just been the leaky gasket that was the biggest issue.

The used pump I bought has very, very tight bearings, to the point that it almost seems they are catching on something. But in the original pump, the bearings are so 'smooth' that I can spin the wheel and it will freely continue to spin very freely.

So, which is preferable? Tight or loose? I already put the original pump back on, mostly in the interest of needing to drive the car. I intend to return the ebay pump as 'faulty'.

Thanks in advance,
JD

[compress ignite]

Bearings Should NEVER be "Tight"

'Whole Idea of Bearings is smooth,roller operation.

[indybenz]

That's *exactly* what I was thinking but wanted to confirm.