ECAE Alternator Belt slipping

cad · 11-08-2022, 01:32 PM

Hello,
I updated my alternator this season from an ECAE 55a mini to the ECAE 120a CS130.
The mini 55a alternator pulley fit belt #15330 perfectly, just did not put out enough.
On the 120a, belt #15330 rides way high in the pulley, slips, and obviously does not keep up while idling through the pits. I can easily rotate the alternator with a ratchet and 2 fingers.

I called East Coast Electric and he said to crank on it and tighten it up more. The belt is very tight now. I am hesitant to use a breaker bar and tighten it up more which I feel would sideload the crankshaft.

What are your thoughts on how high this rides in the pulley?
How tight is too tight?

Photo link:
https://photos.app.goo.gl/Csq4YAcMJPQkvfuz7

Thank you,
Clark

11-08-2022, 01:32 PM	#1
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 702 Likes: 202 Liked 91 Times in 51 Posts	ECAE Alternator Belt slipping Hello, I updated my alternator this season from an ECAE 55a mini to the ECAE 120a CS130. The mini 55a alternator pulley fit belt #15330 perfectly, just did not put out enough. On the 120a, belt #15330 rides way high in the pulley, slips, and obviously does not keep up while idling through the pits. I can easily rotate the alternator with a ratchet and 2 fingers. I called East Coast Electric and he said to crank on it and tighten it up more. The belt is very tight now. I am hesitant to use a breaker bar and tighten it up more which I feel would sideload the crankshaft. What are your thoughts on how high this rides in the pulley? How tight is too tight? Photo link: https://photos.app.goo.gl/Csq4YAcMJPQkvfuz7 Thank you, Clark Last edited by cad; 11-08-2022 at 04:43 PM.