In our newest Tech Tip video, you’ll get a quick overview of what’s really going on.
When a 24SI
TM or 28SI
TM ships, it comes with a cardboard spacer inside the unit. That spacer helps hold the shaft in position until the pulley is installed.
Once the spacer is removed, you might notice:
- The rotor moves back and forth, shifting out of position.
- The shaft slides backward a few millimeters until the fan base touches the rear bearing.
- Noise occurs if the rear plastic fan touches the aluminum frame.
This back-and-forth movement is called end play, and before the pulley is installed, it is completely normal.
The good news: once the pulley is installed correctly, everything falls into place. The rotor settles into its proper position, and the fan can no longer contact the frame, so that noise disappears.
Watch Now: Excessive Shaft Play in New Alternator
Our new Tech Tip video,
Excessive Shaft Play in New Alternator, explains end play in less than a minute. You can also watch our
How to Install an Alternator Pulley video next for step-by step guidance, so you can correctly install the pulley and avoid mistaking normal end play for a damaged part.