Anybody ever overdriven a AC Pump on an 7.3. Did the shim delete on my
AC the other day and noticed that the ware was getting in to the riverts for release spring.

Thanks
Richard

 

Over driving as in, using a larger crank pulley or a smaller clutch pulley? Or as far as installing the pulley/clutch on the shaft?

 

As in installing a smaller pulley and clutch kit on the compressor.

Richard

 

Maybe this will help. This is what I'm looking at.

<TABLE cellSpacing=0 cellPadding=8 width="100%" border=0><TBODY><TR><TD><TABLE cellSpacing=0 cellPadding=0 width="100%" border=0><TBODY><TR><TD class=pageHeading vAlign=top>99-03 Ford 7.3L Powerstroke AC Underdrive Pulley Kit F250/F350 from DFUSER
<SUB>[9903UPULLY]</SUB></TD><TD class=pageHeading vAlign=top align=right>$169.99 </TD></TR></TBODY></TABLE></TD></TR><TR><TD></TD></TR><TR><TD class=main><TABLE cellSpacing=0 cellPadding=2 width="100%" border=0><TBODY><TR><TD class=main vAlign=top>

******** type=text/javascript><!-- document['product1124'].src = 'images/ac_under_pulley_73lsm.jpg' //-->*********>
AC Underdrive Pulley system for your 99-2003 Ford F250/F350 7.3L Diesel, excluding Excursions

• Get more power out of your engine and cooler running A/C.
• General Information:
  1999-2003 Ford F250-F350 Trucks NO Excursions. Single Alternator Systems only
• Features
  • The most complete kit period!
  • New A/C Pulley, clutch kit and shorter Belt
  • New Pulley diameter is ~117mm or 4.6" to Factory ~132mm or 5.2".

</TD><TD class=smallText vAlign=top align=right><TABLE cellSpacing=0 cellPadding=0 border=0><TBODY><TR><TD><!-- // BOF MaxiDVD: Modified For Ultimate Images Pack! //--><!-- // EOF MaxiDVD: Modified For Ultimate Images Pack! //--><!-- // BEGIN Affiliate program mods for 2.5a upgrade DMG -->

<!-- // EOF Affiliate program 2.5a upgrade mods DMG --></TD></TR></TBODY></TABLE></TD></TR><TR><TD colSpan=2>Again Thanks,
Richard

The Truck
</TD></TR></TBODY></TABLE></TD></TR><!-- // BOF MaxiDVD: Modified For Ultimate Images Pack! //--></TBODY></TABLE>

 

So, in reality that is an overdrive kit due to the smaller pulley, not an underdrive kit as it is advertised.


The claims "more HP and "cooler A/C" are not compatible. You get cooler A/C by spinning the compressor a little faster, but it takes MORE engine power to do this.

 

So undersizing the pulley spins the compressor faster makes cooler air but
robs engine of power. Sounds like this is not what I want, just need to go back with stock setup, It's worked for me so far.

Richard

The Truck

 

Anybody have any ideas on a fully charged A/C system intermittently going warm? I have to turn off the air for a few minutes while driving and then it blows cool for a few minutes. Repeat as necessary. Thanks!

 

most likely low freon, or evaporator freezing

 

Yes, you are describing the symptoms of a compressor clutch set too wide, or worn too wide.

Take a look here:
https://www.ford-trucks.com/forums/5...ml#post4464164

I did a small write-up here:
SpringerPop's Compressor Clutch Air Gap

Pop