Pulley Removal and Installation for Alternators with External and Internal fans:
1. To remove the alternator pulley, use a 1/2" Drive impact wrench to loosen the nut.
Most automotive Alternator pulleys use a 15/16 socket. Hold the alternator pulley firmly.
You should use a rag or better a heavy glove. Alternators with external fans can rip up
your hand pretty good if the fan is allowed to spin while removing the pulley. I know this
from experience so be careful. It is recommended that a protective glove and eyewear
be used. The pulley nut uses standard, right-hand threads, rotate in a counter-clockwise
direction for removal as looking at the front of the alternator.
2. Alternator pulleys do not have a key and should be a slip fit. sometime thread locking
fluid or rust gets between the shaft and pulley and a slight amount of heat or puller is
needed to remove the pulley, do not overheat. Install the new pulley, lock washer, and nut by hand.
3. Tighten the nut with an impact wrench until nut is tight (about 70 ft-lbs).
The lock washer must be completely closed. Do not over tighten.
NOTE : Many internal fan alternators use a self-locking nut that do not use a separate lock washer.
You may also use thread locking liquid for better hold.Typical Automotive pulleys are designed
for a 17mm shaft smaller units have a 15mm shaft and some pulleys may require adapter bushing.