A bad pulley can cause fraying on the edges of the belt, and in severe cases can even cause it to break. Just fyi, you'll be disassembling the timing belt too, as the injection pump is also attached to that bracket. If yours is held in threaded aluminum, then it is much more important that a torque wrench is used.
Fixing a Broken Bolt of the Serpentine Belt Tensioner
The serpentine belt in our 2000 wrangler se 2.5l was up for replacement and we broke the bolt in the belt tensioner.
Turn the tensioner pulley counterclockwise and slide the serpentine belt off of the tensioner pulley.
Mechanic said that the a/c housing threads that the tensioner pulley bolt uses, starts to degrade and the first thread or two does not permit a tight fitting. Here is a tutorial for you to view on belt replacement: My idler pulley broke off the metal that wasn't supporting it. Up to $8 cash back another symptom of a potential problem with the drive belt tensioner is unusual belt wear.
Also, you should not be running the engine with a broken tensioner bolt.
This could lead to a broken belt. It's the lower bolt of the 2 shorter ones. I found the pulley under my car with a piece of the metal attached to it. The tensioner will have a square bolt head in the center of the tensioner pulley.
It was rusted out and we couldn’t loosen it and with too much tension broke off the bolt in the threads.
Yes, they make a serpentine belt tool that offers more leverage to install the belt. I took the belt and compressor off to try and bond the metal so back together with jandb bond and loctite. The loctitie is holding up but i haven't put the serpentine belt back on yet. The timing belt tensioner bolt on my vw has a nut to be tightened.
Three weeks later one of the tensioner assembly bolts sheared off at the engine block rendering the car with inop alt/ps.
Usually just the threaded holes strip out. You should be able to use a wrench on the center bolt head and relieve the. I then decide to loosen up the belt with the release bolt on the tensioner. I was just about finished replacing my alternator, tightening the last bolt on the serp belt tensioner when the bolt snapped about an inch down from the head.
And as it was real tight with my pry bar, it suddenly completely breaks off.
I was thinking of leaving it and see how long it lasts with just 2 bolts holding it. I have replaced at least 4 timing belts and the original tensioner bolt is holding very well. So i did my timing belt and water pump on my 08 v6 and all went well. The pulley bolt should be tight.
If the drive belt tensioner pulley has any sort of issue it can cause unusual and accelerated wear on the belt.
My bolt is held in a threaded hole in the cast iron block. If its not tight the pulley will wobble and all the tension on the belt will be held on the long adjustment bolt. Up to $8 cash back joshua l. My tensioner broke and i replace it but i can’t seem to get the belt back on.
It sandwiches the pulley and threaded block to the adjustment bracket.
Chances are, the alternator pulley locked up, went unchecked, and allowed the tensioner to jackhammer on the mounting points until it broke.
