Heavy Duty Alternator

Tech Tip: Pully Installation on Delco Remy 24SI or 28SI

Proper installation of the pulley on a Delco Remy 24SITM and 28SITM ensures that the product will perform as promised. Unfortunately, damaged products are returned as a result of improper pulley installation. Follow the steps below to correctly install the pulley on a 24SI or 28Sl.

STEP ONE
Set the alternator in the horizontal position on a flat surface. If the pulley is installed when the alternator is in the upright or vertical position, the pulley may not be fully seated. This will result in a loose stack-up and early alternator failure.



STEP TWO
Remove the pulley nut and cardboard spacer, and then discard cardboard spacer. Pay special attention to the orientation of the bearing slinger and spacer washer. These items commonly slide off the rotor shaft during removal of the pulley nut and cardboard tub.



STEP THREE
Before installing the pulley, make sure that the spacer washer is placed against the bearing and then the slinger is placed against the spacer washer. Failure to place these in the correct order will result in rotor lock-up and early alternator failure.



STEP FOUR
Slide the pulley in place by hand. Never use a hammer to force the pulley on shaft. This could result in pulley or bearing damage.




STEP FIVE
Take the pulley nut that was removed in Step 2 and use it to hand-tighten against the pulley. Never start the pulley nut with an impact wrench. This could result in pulley or bearing damage.  



STEP SIX
There are two different methods to tighten the pulley nut.
#1: Using pass-through socket 15/16, secure the pulley nut so it doesn’t move. Using a torque wrench with a 5/16 hex head socket placed in the hexagonal hole at the end of the rotor shaft, tighten the rotor shaft counterclockwise to 95-108 N-m (70-80 lb. ft.).
 
#2: Hold the shaft by placing a 5/16 hex wrench in the hexagonal hole at the end of the rotor shaft. Use a click-type torque wrench with an open-ended 15/16 wrench attached. Tighten the pulley nut to 95-108 N-m (70-80 lb. ft.).





You can watch this tech tip video on the BorgWarner YouTube channel.

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