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

Re: ECAE Alternator Belt slipping
 

That's too wide of a belt for that alternator pulley. Does it protrude on the crank pulley like that also, or does it ride flush with the top of the pulley?

Re: ECAE Alternator Belt slipping
 

Belt TOO high---should be even or a little below top edge of pulley---FED 387

Re: ECAE Alternator Belt slipping
 

I would take that belt to NAPA and look for one a little narrower.

Re: ECAE Alternator Belt slipping
 

It rides perfect on the GZ crank pulley paired to the alternator.

15330 dayco is 11.1mm / .44 inch wide.
Goodyear belt #7334 is 8mm and I wonder if that would ride too deep on the crank pulley.

Re: ECAE Alternator Belt slipping
 

Here is how the mini alternator pulley/belt mated.... as intended:

https://photos.app.goo.gl/rHPhMQzKmknjW6R77

Re: ECAE Alternator Belt slipping
 

Hey Clark, do you still have the little alternator? If so, can you swap the pulley over to the 120? Just a thought...

Re: ECAE Alternator Belt slipping
 

How about sending those pics to East Coast :eek:

Re: ECAE Alternator Belt slipping
 

Just swap pulleys from your old alt. to the new.

Re: ECAE Alternator Belt slipping
 

Asked them about swapping, but he said the pulley is different... perhaps shaft size or offset. I did email him the pic. I appreciate the ideas.