Tech Articles / How-To's: Installing Mac underdrive pulleys
Disclaimer: The articles below apply to most 5.0 Mustangs, but in particular hold true for '93 models. Please be cautious when doing on work on your car - these instructions are meant to be pointers and not the end all truth - I do not make any claims to their accuracy and will not be held responsible for anything that may go wrong while following the articles below. If you choose to follow these instructions, you do so at your own risk.
- Disconnect battery cable - remember to remove negative cable first
- Unbolt fan shroud
- Unbolt fan from water pump, making sure not to lose any of the washers
- Lift out fan/shroad assembly
- Remove stock water pump pulley
- Remove four bolts from inside of crank shaft pulley
- Remove stock crank pulley - may need to tap it to loosen
- Unbolt alternator
- Unhook both cables on alternator
- Using impact wrench, remove stock pulley from alternator (if you do not have one, most AutoZones will swap the pulley for free if you bring in new pulley and your alternator)
- Remove any spacers behind stock pulley
- Install new pulley and attach with washer and bolt using an impact wrench
- Rebolt alternator into place, remembering to reconnect cables
- Bolt on new crank shaft pulley
- Place new water pump pulley on
- Lower fan shroud/fan assembly back into place
- Reconnect fan to new water pump pulley
- Route the serpentine belt into place, noting proper direction often noted on stick on front bumper
- Make sure everything lines up properly
- Reconnect battery cable
- Start car momentarilly
- Immediately check belt to see if it remained on path
- Run car again, watching all of your gauges and check belt
*Note: You should be able to use stock cable with these pulleys. As with all underdrive pulleys, your voltage gauge will read lower. However, if it goes into the red, something is wrong. Also, cooling may be reduced. I have a high flow water pump, so no issues have occured with cooling to date.
**Note: After having the pulleys on for several months, I removed the alternator pulley and replaced it with the stock one, as my aging charging system was beginning to have issues. This required a slight change in belt size.