The air pump adds air to the exhaust ports to promote complete combustion. If it makes a noise, the bearings are bad. Look at the 'Buy Parts' link at the top of the page for a replacement, or get another used one from the junk yard. (Look for your car and the part is in the Air Intake section)

http://mb.braingears.com/123_DISK1/program/Engine/110/1977/14-050.pdf

It appears to be a Saginaw (GM) air pump, so availability is good.

http://mb.braingears.com/123_DISK1/program/matrix6.htm

Click on your car.

__________________
Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.