Belt squeak after jump-starting car

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  #1  
Old 02-06-18, 08:58 AM
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Belt squeak after jump-starting car

I think this is just dumb coincidence, but I've been wrong in the past. Yesterday, I had to jump my car (2007 Accord 3.0L V6). The battery was way dead and wouldn't even try to crank. I used my pathetic jumper box, and got a few pathetic cranks from it, but it wouldn't start. I finally jumped it off of another one of my vehicles.

After I got it going, I noticed a squeak from the serpentine belt from down in the area of the crankshaft pulley and belt tensioner. A squirt of water makes it go away, so I'm thinking it's a belt alignment issue.

Can anyone think of a reason why sluggish, hard cranking a couple times could have caused this to pop up? Or am I right and it's just coincidence?
 
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  #2  
Old 02-06-18, 10:05 AM
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With the engine not running check the condition of the belt, probably time to replace it.
 
  #3  
Old 02-06-18, 10:34 AM
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I did double check when I heard the squeak, but the belt appears fine. It is actually only 6 months old.
 
  #4  
Old 02-06-18, 10:38 AM
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The two are in no way related. Probably has more to do with the temperature outside or just the fact that your head was under the hood and now you notice it.
 
  #5  
Old 02-06-18, 11:39 AM
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This is likely due to belt slip because the alternator is much harder to turn over when charging a battery, in this case heavy charging of a dead battery. In some cases the noise won't go away until after the battery has charged a bit, or in some cases while the battery is charging if you rev up the engine you will hear that squeaking / squealing. As the battery charges the torque required to turn over the alternator decreases. This is likely caused by either a worn belt, or a loose belt. Belt dressing can be a temporary fix to the noise, but its not a fix to the belt.

Honestly if you think the belt looks fine, and the tension is fine I would not worry about it, since its only a 'hard turning' alternator that is too blame. But I think the belt is indeed worn and thus you should consider replacing it, or taking the vehicle to a Honda garage and have them look it over. Maybe the belt tensioner is weak for example.
 
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Old 02-06-18, 11:46 AM
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"This is likely due to belt slip because the alternator is much harder to turn over when charging a battery, in this case heavy charging of a dead battery."

This !

Hope you're getting a new battery today.
 
  #7  
Old 02-06-18, 11:59 AM
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I'd vote for the alternator having to drive harder too. I'd check the tension on the belt.
 
  #8  
Old 02-06-18, 04:15 PM
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Alternators put out voltage relative to speed, they do not work "harder" or exhibit higher torque due to low battery!
 
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Old 02-06-18, 05:16 PM
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If they create electrical energy, they consume mechanical energy. You can't get something for nothing.
 
  #10  
Old 02-07-18, 03:50 AM
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Originally Posted by Marq1 View Post
Alternators put out voltage relative to speed, they do not work "harder" or exhibit higher torque due to low battery!
I really wish I had not deleted my YouTube channel where I had posted videos of my homemade DC based generator. 10 HP gas engine, 200 amp transport truck alternator, and ac/dc inverter. Anyway in one of the first videos I show that when you switch electrical load off or on, you can hear the engine 'strain' change correspondingly. In fact in the very first video I show that the engine governor is broken. When I switch off the electrical load you see the engine rev like crazy, yet when I switch on heavy load the engine is barely able to keep up.

Bottom line: energy cannot be created nor destroyed, it can only be converted. Thus in power generation it takes a certain amount of mechanical energy to be converted into an 'equivalent' amount of electrical energy. As electrical power (the measure of energy dissipation) increases, the amount of mechanical energy has to increase proportionally. The net effect of that behavior is that the torque resistance of the generator shaft is also proportional to the amount of power/load being driven by the generator. If that were not true (that shaft rotational resistance does not change) then why do they not use a 5HP engine to power a generator for a whole city? Engine governors 'hide' this behavior quite well, but on engines like small generators, snow throwers, and lawnmowers that have a minimum noise suppression (exhaust) system you can 'hear' this behavior quite easily. Test it for yourself, remove the governor spring on you lawnmower and see what happens. Just don't blame me if it over revs (when just sitting there) and throws the crank through the side.
 
  #11  
Old 02-07-18, 07:13 AM
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Well, that derailed quickly. Never mind.
 
  #12  
Old 02-07-18, 07:54 AM
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Although I can't say for certain it is why your belt was squeaking, there is truth to the alternator being harder to turn/having more mechanical resistance when charging a dead battery. Google back emf and inductors if you are so inclined. If your battery is now charged and there is no more squeaking, then there ya go.
 
  #13  
Old 02-07-18, 07:58 AM
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Except that I never asked about the alternator. I said that I believe there is a pulley misalignment causing the squeak/chirp, and whether hard cranking could have created such a problem.
 
  #14  
Old 02-07-18, 08:46 AM
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Which is why I suggested taking the car to a Honda garage. They are the experts of your Honda car.

And I don't think the thread derailed. People offer their opinion/knowledge, and sometimes other people will offer a different (sometimes countering) opinion/knowledge, and hopefully in the end we together hit the nail on the head. Plus too keep in mind, you may not be the only one benefiting from this discussion.
 
  #15  
Old 02-07-18, 09:18 AM
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You probably do not have a pulley misalignment, but you do have a low battery. The alternator would be under extra load to bring the battery up to charge. After the battery is fully charged the alternator only feeds accessories so the chirp would likely go away.

It sounds like the belt tension is too loose.
 
  #16  
Old 02-07-18, 12:33 PM
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Let's get back to the real problem. Why was the battery dead in the first place ??
 
  #17  
Old 02-07-18, 12:35 PM
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I checked with my Powertrain contacts and the response was maybe.

Newer automotive electrical systems have greater control for vehicle/battery electrical systems, alternators use much less engine power than in the past. The difference between an alternator on a fully charged battery vs a low battery is 3-4 hp.

Enough to induce enough load to cause a belt to make noise, they didn't think so, but if the belt was worn, maybe!
 
  #18  
Old 02-07-18, 02:15 PM
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I see you are in MD. The overnight temps the other day were approaching the teens. This likely killed your battery and caused the chirp. You're going to need a new battery, and assuming the cold weather caused the chirp, I wouldn't worry about it.
 
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