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Alternator belt tuning.

 
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  • 3 Post By VsandFords
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Old 08 Aug 2017, 02:45 pm
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Default Alternator belt tuning.

I read in the 01-04 pdf shop manual this was the way to go for proper belt tightening. Is this how the rest of you do it? In the process I discovered the nearby household A/C compressor hums along at about 42 Hz.

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Old 08 Aug 2017, 03:13 pm
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Default Re: Alternator belt tuning.

Man, am I lost! This old Texas country boy tightens it until it feels " just about right and good enough for the girls I hang with!"
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Old 08 Aug 2017, 03:20 pm
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Default Re: Alternator belt tuning.

me too. i just tighten it until it feels OK to me. a little loose is better than too tight.

too loose might make it squeak when you start it, where as too tight will ruin the alternator bearings fairly quickly

i have my mustangs belt just tight enough that on a cold damp day, it may let out one baby chirp when i turn the key in the morning. that's perfect for me

maybe i over think it as well..
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Old 08 Aug 2017, 03:26 pm
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Default Re: Alternator belt tuning.

Well, yeah that's kind of the way I was. But hey, if the manual says between 235-247 Hz then I recon (that's Texan) that's what I'll give it. Wasn't that hard either. Just happened to have a tuning app on my Kindle Fire that worked like a champ. My belt is now tightened enough to give 241 Hz. I feel like such a pro! Doesn't take much to make me happy.

Thanks for your response.

RVC
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Old 09 Aug 2017, 07:02 am
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Default Re: Alternator belt tuning.

Here's the instructions from the service manual. You don't really need the Miller 8371 microphone wand nor a DRBIII. Any simple instrument tuner that can read out in Hz will work.

BeltHzTensioning.jpg
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Old 09 Aug 2017, 07:24 am
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Default Re: Alternator belt tuning.

In figure 8... Can you even see that in real life?
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Old 09 Aug 2017, 07:35 am
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Default Re: Alternator belt tuning.

Quote:
Originally Posted by rob302 View Post
In figure 8... Can you even see that in real life?
Bore scope, maybe?

If like where I work, the young engineers get the job of writing the manuals so they don't always know under what conditions the real item is serviced.
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Old 09 Aug 2017, 07:44 am
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Default Re: Alternator belt tuning.

Figure 7 refers to the "tuned" alternator belt. Figure 8 is about the belt for the A/C compressor and the Power Steering pump. That belt has an automatic tensioner which is shown.
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Old 09 Aug 2017, 07:53 am
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Default Re: Alternator belt tuning.

I know, I've had the pleasure of changing it
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Old 09 Aug 2017, 07:54 am
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Default Re: Alternator belt tuning.

Yep. Me too, twice.

My question on Figure 8 is if a technician could actually see the marks on the tensioner, what would he or she do if the marks didn't line up? The manual doesn't say and there's no adjustment. Should he just try another belt or what?

PS: I know it's actually to check for stretching on a used belt and/or to possibly help indicate other problems like a bad idler pulley bearing. But it just seems strange.
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