The Amazing Disappearing Alternator belt

dud

Diamond Member
Feb 18, 2001
7,635
73
91

My wife and I are planning on gifting her 99 Protege (67K miles, 5-speed, 1.6 liter) to my son. He has been driving it part-time for a few months.

Now here is where it gets WEIRD! My son works from 5 PM to 2 AM. Monday morning I get a call from the kid telling me that the car died AND that it was overheating at the time. He also told me that he got a jump but the car died a block later. This instantly tells me we have an alternator problem ... but it's also overheating (as in water pump). I have it towed to the house and pop the hood. Within five seconds I know the problem ... the alternator/water pump belt is gone. I replaced the belt and battery later that morning and everything is fine ... right?

WRONG! It's Friday evening and the kid AGAIN calls me, letting me know the thing is overheating AND the battery warning light is on. He brings it home and ... you guessed it, the 4-day old belt is gone AGAIN!

I've replaced belts before and never had a problem ... especially like this.

Anyone else ever run into this before? I'm off to the auto parts store to buy another belt that, for some reason will probably last another week. The funny thing is that my wife drove it for 8 years without a problem ... and then all of the sudden the kid loses two (2) belts in one week.

BTW, the outer AC/power steering belt is fine.

Thanks ...
 

dud

Diamond Member
Feb 18, 2001
7,635
73
91
"i thought you meant someone was stealing the belt..... "


That would be a good trick. The alternator belt is inside the power steering/AC belt (which is still there! I can't figure this one out ...
 

Zenmervolt

Elite member
Oct 22, 2000
24,512
21
81
Originally posted by: thedarkwolf
Make sure one of the pulleys isn't bent causing it to throw the belt.

Ding! We have a winner.

One of the pulleys is throwing the belt. The kid ran over something that got kicked up and put a nice dent in one of the pulleys. It could have been something as simple as a small rock that just happened to hit something wrong, so it's entirely possible that your kid had no idea he ran over anything.

ZV
 

iamwiz82

Lifer
Jan 10, 2001
30,772
13
81
How is the belt tensioned? If it's an auto tensioner, did the spring fail or stretch?
 

dud

Diamond Member
Feb 18, 2001
7,635
73
91
iamwiz82,

Good question. The belt is tensioned by adjusting the alternator (on an adjusting bracket).

I am going to install a new belt and monitor each and every pulley for signs of deformation.


Wish me luck ...
 

jagec

Lifer
Apr 30, 2004
24,442
6
81
You might want to confirm that you can turn all of the pulleys by hand. I once snapped my alternator/waterpump belt...turns out the waterpump hadn't been changed in ages, and it had pretty much locked solid. Changed the waterpump, and all was well.
 

davesaudio

Senior member
Oct 24, 2000
350
0
76
varta1.com
Once after rebuilding an engine I forgot a big honkin washer that held the harmonic balancer and pully seated,
glad it threw the belt before anything worse happened.
 
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