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Putting fan belt back onto the pulley for a 2002 bmw 525i sedan.

I had to change the alternator for my bmw 525i.. i pulled the fan belt out of the pulley to replace my old alternator for a new one. after putting my new alternator in i am having a hard time putting the fan belt back on the pulley.. when i put the fan belt back onto the 5 pulley's its not as tight as it was before. why is that.. what am i doing wrong?

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The tensioner , have to retractit. Vitally

Posted on May 22, 2009


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How do I replace the broken fan belt on my y2000 Mazda Bravo 2wd petrol ute? I need to know which parts to loosen, and how to loosen them, so I can slip the belt over the pulleys. I can see where the

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How to change belts on 2002 Nissan Frontier 4 cylinder

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Belt diagram route for 2003 BMW 525I

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Driving my 92 525i bmw on freeway when it all broke loose my Power Steering and then all the lights on dash when on. Also the car over heated. What could have happen?

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Alternater change belt release

Hi and Welcome to Fixya

Here's how to replace the belt.

Disconnect the battery ground cable and lay it aside, ensuring that it does not touch metal. Unplug the wiring harness connector on the back of the alternator if so equipped. If you can't pry the plug tangs open with your fingers, use a screwdriver.
Remove the nuts on the back of the alternator with a wrench then pull the wires off the studs. Loosen the accessory drive belt tensioner with a socket, by pushing the tensioner towards the engine. Lift the belt off the pulleys.
Unbolt the alternator mounting bolts with the appropriate socket then remove the alternator.
Fit the new alternator onto its bracket then insert the mounting bolts. Tighten the right bolt to 18 foot-pounds of torque then tighten the left bolt to 37 foot-pounds of torque. Route the accessory drive belt around the pulleys, except for the tensioner pulley. The drive belt routing diagram is located on the fan shroud or the inside of the hood. Push the tensioner towards the engine. Slide the belt on the tensioner then release the tensioner.
Plug in the wiring harness connector if so equipped. Slide the wires onto the proper terminals on the back of the alternator. Tighten the battery feed wire nut to 71 inch-pounds of torque. Reinstall the negative battery cable.

Have a good one!

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First check all pulleys for wobble or looseness. If all pulleys are OK, use the below diagram to put the belt on all pulleys except alternator. Put a wrench on tensioner pulley and pull down until the belt will slip onto the alternator pulley. Check that belt is still on all pulleys before starting. If belt comes off again, one of the components is failing (usually an idler, tensioner or water pump wobbling).


Sep 03, 2010 | 2001 Ford Escort ZX2

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Step by step instructions replace alternator on a 2000 Lincoln Continental

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Diagram for serpentine belt for 2002 BMW 525i

An image of a serpentine belt, hope this will help you,

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