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| Weird Engine Sound http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=72803 |
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| Author: | Mykol [ Mon Dec 10, 2012 10:05 pm ] |
| Post subject: | Weird Engine Sound |
At idle, the engine purrs like a kitten but I do hear a distinct "chatter" kind of a sound. Sounds kinda metallic, chirping chatter, like if you ever have spun a unloaded pulley that has a bad bearing. It is persistent generally, but occasionally comes and goes. Smooths out and sounds fine at anything above idle. Any thoughts? Has 160k trouble free miles! Thanks |
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| Author: | papaindigo [ Tue Dec 11, 2012 7:19 am ] |
| Post subject: | Re: Weird Engine Sound |
I assume you changed your timing belt at the proper 100k miles interval? As to the noise you might take a look at your alternator pulley; at idle is the serp belt tensioner noticeably bouncing. If so that pulley is gone. It can be replaced but it may be easier to get lifetime warranty alternator from like Autozone. |
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| Author: | Mykol [ Tue Dec 11, 2012 8:41 pm ] |
| Post subject: | Re: Weird Engine Sound |
Yes sir, did the timing belt. I will check the alternator pulley Thanks! |
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| Author: | acuboy [ Tue Dec 11, 2012 11:47 pm ] |
| Post subject: | Re: Weird Engine Sound |
This may sound completely obvious, but I had a similar sound the other day when I was on a road trip. I just got the Jeep back from having the timing belt done and they replaced all the pulleys. Naturally my mind drifted to it being one of these parts failing, as it sounded very similar. Then I noticed that my transmission fluid dipstick was about 1/2 inch not seated properly. I pushed it all the way down and sound resolved. I felt a little dumb. |
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| Author: | Mykol [ Wed Dec 12, 2012 11:34 pm ] |
| Post subject: | Re: Weird Engine Sound |
Thanks for the reply but I had wired the transmission dipstick in the seated position long ago! Still haven't figured out what the sound is though. Thanks! |
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| Author: | CATCRD [ Wed Dec 12, 2012 11:43 pm ] |
| Post subject: | Re: Weird Engine Sound |
Your description sounds exactly like a bad alternator pulley. Sometimes people take off the belt and spin the pulley and think it's fine, not realizing that inside the pulley should be a one-way clutch that allows the belt to turn the shaft one way (CW), but not the other. If your pulley is locked in both directions, it's bad. |
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