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Old 03-31-2019, 10:21 PM   #1
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Alternator Belt Tension

Today I had a squeal come from the engine room above 1000 rpm but it seemed intermittent as throttling back a minute or two stopped it, Iím pretty sure itís coming from the alternator (dual belt toothed v belt Balmar 200a). Whatís the proper tension on these? Even though itís a brand new JD 6068 it seems like there isnít any sort of a tensioner, instead the alternator has a bolt you loosen and there is a track that bolt fits in that tensions it.

Also whatís the best way to confirm an alternator is working as the Balmar is not brand new but I was told it looked to be in perfect order.

Thanks!
Arthur
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Old 04-01-2019, 06:44 AM   #2
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Measure the engine start batt voltage at the alt before starting.

Measure it again with the engine operating

12.6V or .7 or .8 off 13V to 14+ when operating.
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Old 04-01-2019, 11:54 AM   #3
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If belt is squeaking, tighten it up a little. Subjective to say how tight is just right, belts are flexible and geometry can be whatever. But comfortable saying this: If it squeaks, it is too loose. Or something else is making the noise.

Yep, check batt volts with engine (and charger!) off. Normal charged batt is 12.6 or so, can be a little higher if you just turned the charger off.

Then start engine and rev to say 1000rpm. Check volts again. Should be 13.8-14.2, but the Balmar regulator may go a bit higher than 14.2 until it senses batts are topped off. See those volts and alt is fine.
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Old 04-01-2019, 08:57 PM   #4
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There are belt tension gages available (Napa Auto parts for example has them) which takes some of the guess work out. You need a different one for a micro-V as the tensions are higher. Napa has both kinds - around $15 - 20 as I recall.
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Old 04-02-2019, 06:23 AM   #5
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I find an adjusting tool w two concave V shaped ends and turn buckle type adjustment works well and worth a few bucks to keep in the spare parts bin. Loosening bolt and trying to adjust w a lever arm jammed in someplace just didn't work well for me. The tool holds everything in place while you tighten and check tension... EZ Peezey
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Old 04-02-2019, 06:52 AM   #6
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Bacchus, do you have a link for the tool that you are talking about? This would make life so much easier if it fits my 6V92 DD. Thanks.
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Old 04-02-2019, 07:29 AM   #7
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There is information and part numbers for belt tension tools in this article:

https://marinehowto.com/marine-alternator-installation-tips-tricks/








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Old 04-02-2019, 07:31 AM   #8
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This is the type... you might check Hbr Frt or local auto parts.
https://www.amazon.com/Supco-Belt-Te...52475703&psc=1
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Old 04-02-2019, 07:50 AM   #9
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Agree with CMS...make your own....custom sized and padded for your engine setup.


Store bought break pretty easily.
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