The air pump on my 420SEL is a Denso. During my continuing rebuild saga, see Chain Guides Replaced, I just checked the front pulley and it rotates just fine.

I also found that the A/C belt adjusting pulley was seized. I took the pulley off and oiled it. It's now silky smooth.

__________________
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.