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Tensioner

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Question
Squeaking noise coming from under the hood upon cold start.
Hey there, thanks for writing in. The noise can be the serpentine belt tensioner not putting enough tension on the belt. In this case, you would most likely need to replace the tensioner along with the belt to resolve this...
Question
I have a whining squealing noise coming from somewhere in my pulley system and serpentine belt.
If the noise changed when the battery was replaced, I would first suspect the alternator. Sometimes, when a bearing/bushing starts to go bad it will only make noise with the belt installed, as the tension can cause pressure to be...
Question
What can cause the drive belt to stop moving for a second or two, then come back on and repeat?
You should look at the lower crankshaft pulley to see if it is not spinning when the belt stops. If that is the case, then the crankshaft damper rubber is not gripping the hub and needs replaced. If the pulley...
Question
Passenger seat belt system failed - 2008 BMW 528xi
The SRS system needs to be interrogated for faults. Faults in the supplemental restraint system (SRS) will effect the triggering logic of the airbags in the event of an accident so it is highly recommended that you get the system...
Question
What is the difference between a tensioner and tensioner pulley?
Hi, thanks for your question. For your 2009 Honda Odyssey, the tensioner and tensioner pulley are one unit. They make up what is called the tensioner assembly. This tensioner assembly has two pulleys located on it and they can be...
Question
Concerned about cam belt tensioner apparently being installed the wrong way around
Hello. If there was any damage that was going to be done it would have been that way then you dropped it back off. Besides some noise the vehicle would have been running very poorly. If the engine was running...
Question
Do I need to replace the timing chain tensioner cover gasket?
This would depend on the severity of the oil leak. If the oil leak is fast, I would recommend having this issue resolved as soon as possible to prevent any damage to your engine. The labor charges likely high due...
Question
Alternator belt noise when running the air conditioning
Hello. Noise signifies a problem. The problem could be a worn belt but the noise could also be due to a faulty tensioner, misaligned pulleys, or glazing on the belt which by the way in certain configurations will result in...
Question
I am trying to remove the alternator, but I need to free up more space.
Hi there. As a former Lexus master technician, this was one of the jobs that seemed like the engineers weren't in their right minds when designing it. We had to loosen the core support that holds the radiator, support it...
Question
Need a reliable brand for the belt tensioner.
Hello and thank you for contacting YourMechanic. Shopping around for parts can be frustrating when it comes to specific brands. Some brands are not as good as other brands, however, a low quality belt and a high quality belt should...
Question
Idles between 500rpm and 1300 rpm. Main concern is low rpm. Belt or pulley chirping mainly at low rpm Drives perfect but Idles bad
Chances are these two symptoms are related. If the drive belt is not performing as designed the engine will run poorly, or not run at all. There are several components that could be the problem, and further inspection is needed....
Question
Removal of the serpentine belt tensioner
Hello, the Polo was never officially introduced to the North American market, so our resources for technical assistance are a bit thin. Nonetheless, I'll refer to a parts supplier for the Polo, and their VW Technical Articles. This article for...
Question
Just replaced both belts on 2008 Fx35 infiniti.
Hey Dan, thanks for inquiring. I don't know that you necessarily need to replace your pulleys, neither tensioner or idler. However, if you are hearing a squeaking from your engine and suspect the pulleys are the problem then replace them...
Question
When I turn the ac on it makes a very loud squeal that stops after a few minutes. 2007 Jeep Commander
Hi there - It's possible that the tensioner/idler pulley for the serpentine belt(https://www.yourmechanic.com/services/loud-squealing-or-rattling-is-coming-from-engine-inspection) by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and...
Question
Drive belt keeps popping off
The first thing to check is whether all of the pulleys are in the same plane. Imagine a flat surface applied up against the pulley edges. Do all pulleys touch the flat surface? If a pulley, for instance, on the...
Question
Broken timing tensioner pulley
Hello there, a broken timing belt tensioner pulley will cause big issues with your 1990 BMW 325i. When the timing belt slips or breaks it can cause the valve timing to get thrown off and the valve can hit the...
Question
Knocking noise. Is it a problem with the belt?
Hello - No, it is incorrect to assume that you couldn't install the new tensioner even though it is of different length. Was the new tensioner longer or shorter? If shorter, there may not be adequate tension on the belt,...
Question
I'm having problems with the serpentine belt, is it caused by my power steering hose?
This is quite likely not a power steering pump or a rack and pinion problem, as neither of these would cause the serpentine belt to fall off. The rack and pinion is a part of the power steering system; however,...
Question
serpintine belt and tensioner pulley replacement.
Hello. Thanks for writing in. Obviously you will want to clear some room to have access to the tensioner. This is easiest done by removing the radiator. Once you have the old tensioner removed, you simply reverse the process to...
Question
I replaced my tensioner and drive belt and the tensioner still jumps when its in gear. What could be the problem?
Hello. You may need to approach this issue from two different angles. One of which is to figure out if the tensioner is mounted incorrectly. Make sure the retaining bolt or screws are dry and tight. If the pulley wiggles...

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