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Old 04-02-2003, 09:53 AM
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G-Benz G-Benz is offline
Razorback Soccer Dad
Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
Originally posted by RDMosley
Thanks for all the good info. I finally wound up just replacing the pully and bearings on the pump. JDUB, I would be very interested in knowing what length serpentine belt is required if I ever decide to remove the air pump entirely.
As far as serpentine belt size, pick the length for your vehicle that would be correct for the same configuration "sans" one ancillary the A/C. I believe they are sold that way.

Curious as to how you managed to procure the correct bearings for that pump?

One of the big issues with why we have to go to rebuilt units is that the bearings are a metric-size, impossible-to-find component...otherwise, most of us would have just cracked open the air pump housing and done the swap ourselves!

Share us your secret...

BTW, the sole purpose of the air pump is to spool up the optimum emission efficiency more rapidly. This is most important in Europe, where laws require emissions tests to be performed within 60 seconds of starting the engine.

Here in the US, it's not that critical, so the pump could be deleted from the system entirely.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car
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