Serpentine Belt Off Center on Tensioner Idler Pulley - EvoXForums.com - Mitsubishi Lancer Evolution X Forums
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Evo X Engine (4B11T) Discussion for engine systems that are unique to the Evo X. IF THE TOPIC IS COMMON WITH OTHER LANCERS, PLEASE POST IT IN: '08+ Lancer Common.

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Old 09-09-2019, 02:12 PM   #1
dalastcwood
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Serpentine Belt Off Center on Tensioner Idler Pulley

Hey guys, I'm having an issue where my serpentine belt is riding off-center (closer to the wheel) on the tensioner idler pulley. It's pretty bad, as in almost half way off the pulley. When I go under and readjust it to the proper position, it goes right back to the bad position the moment I crank it. I haven't noticed any symptoms/strange sounds as a result of it, but it's driving me crazy, as I feel like the belt can go at any moment. I suspected the pulley itself may have been bad, so I replaced it and it does the exact same thing.

A few months back, the belt broke and I installed a new one. I suspect this misalignment may have been the reason it broke back then. Do you guys think the tensioner itself could be bad and causing the problem? I noticed a little lateral movement (towards the wheel) from the pulley when I relieved the tension. Maybe something else is out of whack? Any advice on how to check proper alignment of other pullies? I've searched and found nothing specific to this, and I'm hoping that maybe someone else has had this issue and can help.
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Old 09-09-2019, 03:44 PM   #2
Kento240
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Replace the tensioner. BE CAREFUL of the car overheating. Once the belt comes off then the waterpump ceases to work and temps rise very fast. If you have already overheated the motor then I highly suggest pulling the head off and resurface the head and inspect the exhaust valves.
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Old 09-09-2019, 04:19 PM   #3
W1bowo
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Quote:
Originally Posted by Kento240 View Post
Replace the tensioner. BE CAREFUL of the car overheating. Once the belt comes off then the waterpump ceases to work and temps rise very fast. If you have already overheated the motor then I highly suggest pulling the head off and resurface the head and inspect the exhaust valves.
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Old 09-10-2019, 09:16 PM   #4
turismolover22
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The three idler pulleys that mitsu used are all made of plastic, and are known to fail from wear. I would suggest replacing them with the metal Hyundai pulleys and your issue should go away.

The belt could of broken/bent something, but its more likely a bolt got bent if there is an issue of misalignment. Cast aluminum just tends to break.

There are plenty of write ups on the Hyundai pulley mod, I will suggest that you get the Hyundai tensioner pulley bolt as it has a larger shoulder and a longer head to accommodate for the difference in pulley design. There are other little nuances like having to shim the pulley but you'll see that in the write-ups.
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