Tweeting Sound From Serpentine Belt Area
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Junior Member
Joined: Jun 2015
Posts: 8
From: Spring Hill TN
Tweeting Sound From Serpentine Belt Area
My 2007 Tucson has developed a tweeting sound under the hood in the area of the serpentine belt.
If I look it as it is running it seems that the belt is not centered on the tension pulley but is toward the edge away from the engine.
Another thing. I was staring at the serpentine belt and listening to the tweet-tweet-tweet. I can almost convince myself that the end of the crankshaft pulley is wobbling with the same rhythm.
The engine has 103K miles and got a new timing belt, pump, etc at 76k.
Any ideas what it could be and how to isolate it.
Thanks In Advance,
Pete
If I look it as it is running it seems that the belt is not centered on the tension pulley but is toward the edge away from the engine.
Another thing. I was staring at the serpentine belt and listening to the tweet-tweet-tweet. I can almost convince myself that the end of the crankshaft pulley is wobbling with the same rhythm.
The engine has 103K miles and got a new timing belt, pump, etc at 76k.
Any ideas what it could be and how to isolate it.
Thanks In Advance,
Pete
Thread Starter
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Junior Member
Joined: Jun 2015
Posts: 8
From: Spring Hill TN
Just an update. It was the crankshaft pulley. I replaced it. Total job took about an hour and a half. But back in October 2013 I replaced the Timing belt so I very familiar with working in this area.
I concluded it was the crankshaft pulley from some websites. Two sites said that the noise could be either pulley misalignment or belt slip. Both said that to determine what the cause was I should spray the ribbed side of the belt with a little water from a spray bottle while the engine is running. If the sound went away it was a pulley misalignment problem. If it kept tweeting (chirping they called it) it was belt slip. Sorry I didn't save the links but a little searching should turn them up.
Well, with the engine running I just shot one spritz and in an instant the tweets stopped. Conclusion, pulley misalignment. Since everything looked lined up but there seemed to be wobble in the crankshaft pulley I decided to change that. Note, back about 1968 I was driving my mother's 1962 Mercury Comet and the crankshaft pulley separated and smashed through the radiator so I was aware of what could happen.
FYI, the crankshaft pulley is made in two sections. The outer rim on which the belt rides and the center part that is bolted to the crankshaft. There is a rubber "shock absorber" like ring jammed in between the two and that keeps the two sections together. Mine dried out and began to crumble. In fact, it had gone so far that the timing notch on the outer rim had slid almost 150 degrees away from the proper position.
Anyway, a replacement crankshaft pulley costs ranged from $60, $100, $170, to $225. I bought the $60 one and a new serpentine belt since I had to take the old one off anyway.
The only tricky part of this job is getting the crankshaft pulley nut loose. To get it off I contemplated using the technique on YouTube where they jam a wrench on the bolt and fire the starter. It scared me a little. I decided I could make a tool to hold the crank pulley while I turned the bolt. I had an old lawn mower blade. It had a hole in the center that fit over the pulley bolt. It also had two slots. I put a 3/8 x 1" bolt in each slot with a nut on the "back side". I could arrange the bolts to just fit in the holes in the pulley. Then I put my breaker bar on the pulley bolt and loosened it.
Everything is quite as a church mouse now.
I hope this helps someone else.
Pete
I concluded it was the crankshaft pulley from some websites. Two sites said that the noise could be either pulley misalignment or belt slip. Both said that to determine what the cause was I should spray the ribbed side of the belt with a little water from a spray bottle while the engine is running. If the sound went away it was a pulley misalignment problem. If it kept tweeting (chirping they called it) it was belt slip. Sorry I didn't save the links but a little searching should turn them up.
Well, with the engine running I just shot one spritz and in an instant the tweets stopped. Conclusion, pulley misalignment. Since everything looked lined up but there seemed to be wobble in the crankshaft pulley I decided to change that. Note, back about 1968 I was driving my mother's 1962 Mercury Comet and the crankshaft pulley separated and smashed through the radiator so I was aware of what could happen.
FYI, the crankshaft pulley is made in two sections. The outer rim on which the belt rides and the center part that is bolted to the crankshaft. There is a rubber "shock absorber" like ring jammed in between the two and that keeps the two sections together. Mine dried out and began to crumble. In fact, it had gone so far that the timing notch on the outer rim had slid almost 150 degrees away from the proper position.
Anyway, a replacement crankshaft pulley costs ranged from $60, $100, $170, to $225. I bought the $60 one and a new serpentine belt since I had to take the old one off anyway.
The only tricky part of this job is getting the crankshaft pulley nut loose. To get it off I contemplated using the technique on YouTube where they jam a wrench on the bolt and fire the starter. It scared me a little. I decided I could make a tool to hold the crank pulley while I turned the bolt. I had an old lawn mower blade. It had a hole in the center that fit over the pulley bolt. It also had two slots. I put a 3/8 x 1" bolt in each slot with a nut on the "back side". I could arrange the bolts to just fit in the holes in the pulley. Then I put my breaker bar on the pulley bolt and loosened it.
Everything is quite as a church mouse now.
I hope this helps someone else.
Pete
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