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How do I replace the serpentine belt and pulley on my BMW 1997 540i

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There are tensioners u need to pry back no to loosen/slacken the belt tension to remove the belts, there is one for the main belt, the AC one has a nut and bolt u have to loosen to get it off

Posted on Aug 24, 2010

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Changing a serpentine belt on an E36 BMW 318i(316i)


Remove the radiator cowling. It has 2 connecting clips(arrowed in photo)

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Remove these clips by pushing out the centre portion with a small screwdriver as shown below.

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Lift the cowlin up and remove. Be careful of pushing it against the radiator fins.
Locate the A/C tensioner pulley on the righthand side of the enginebetween the A/C compressor and Crankshaft, and pry off the dust cover(arrowed) with a screwdriver.

3edfaf8.jpg

Loosen the 13mm nut inside and remove the belt.
Turn the 16mm bolt on the serpentine tensioner pulleycounter clockwise to slacken the belt and remove the belt. Refit the new belt to the routing diagram below and using the 1st track (closest to the engine) on the crankshaft
  1. Crankshaft
  2. Water pump/fan pulley
  3. Idler pulley
  4. Alternator
  5. Power steering
  6. Sepentine belt tensioner


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If you are replacing the tensioner pulley remember that it is held in place by a reverse threaded bolt, so turn clockwise to loosen it.
Refit the A/C belt. fasten the tensioner pulley bolt by hand. Using a 10mm allen key in the hole in the pulley(arrowed), tension the belt, keep pressure on the allen key and fasten the pulley bolt with a wrench.
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When refitting the fan shroud, position the shroud. It has a tab on each side halfway down the shroud that needs to locate in the radiator. Remove the centre pin from the shroud's clips completely. Insert the clip into its position and then insert the centre pin of the clip and push it in until flush with the clip itself.

on Oct 15, 2010 | BMW 318 Cars & Trucks

1 Answer

BMW 2006 325i AC compressor + serpentine belt repair time mechanic


I have checked BMW schedule time for repair which is 2.25 hrs. This details
R+ R COMPRESSOR
DRAIN/REFILL AIR CONDITIONING
R + R FRONT ASSEMBLY PROTECTION
R + R DRIVE PULLEY ALTERNATOR .
Hope this helps.

Nov 19, 2013 | 2006 BMW 325i

1 Answer

Having problems putting serpentine belt back on a 2003 525 2.5 liter bmw


Pop the dust cap off the tensioner pulley and grab it by the bolt inside the pulley. Then you can twist it against the spring tension to make slack.
Because the tensioner moves so far when there is no belt on it, some folks find it easier to slip the new belt over the top of the old belt, so you need to move the tensioner only a quarter inch or so to slip the new belt in between the old belt and the tensioner. Then, when the new belt is in place, you cut the old belt out. I have never tried it because I am usually replacing at least one tensioner bearing when I replace belts, but it sounds like it might work well.

Jul 30, 2011 | BMW 525 Cars & Trucks

1 Answer

How to tension the BMW x5 4.4i 2003 serpentine belt


All BMWs use a spring loaded tensioner. if you are having trouble with the tension then you need to find /use the correct belt path. If you are having trouble getting the belt on the tensioner, then use a section of the old belt to tug the new belt onto the Alt. pulley.

The tensioner that is on the BMW 4.4L M104 motor is found near the idle pulley and can be locked into the slacked position with a 1/4" thick bolt that has the threads ground off also the tensioner can be operated with a 3/8 drive ratchet. Apply tension to this pulley after getting the belt wrapped around the other pulleys and then fit it over the Alt. pulley last.

May 24, 2011 | 2003 BMW 5 Series

2 Answers

Change serpentine belt on 06 sienna


  1. 1 Check to ensure the Sienna's engine is cold, then make sure the Sienna is in park, the ignition is in the off position and the key is removed from the ignition to prevent any possibility of the engine engaging during the serpentine belt replacement.
  2. 2 Open the hood and locate the serpentine belt routing diagram sticker on the side of the engine casing. Study it for a moment before removing the existing belt. It is essential the new belt be installed exactly as the diagram indicates.
  3. 3 Find the tensioner pulley, the main pulley that controls the serpentine belt, and fit a 1/2-inch socket wrench over the self-tensioner on the outside of the pulley.
  4. 4 Pull the wrench to the left to move the pulley forward, which loosens the belt, then remove the belt.
  5. 5 Compare the old serpentine belt with the new, replacement belt for length, width and number of grooves on the belt's underside. Be certain the replacement belt is the right part.
  6. 6 Fit the new belt on to each pulley according to the serpentine belt routing diagram on the manufacturer's sticker, or according to the drawing made prior to removing the old belt. Fit the new belt on to the tensioner pulley last, again applying pressure on the pulley's self-tensioner with the half-inch socket wrench to loosen the pulley.
  7. 7 Release the pressure on the self tensioner and allow the tensioner pulley to ease back into place, thereby tightening the new serpentine belt with the appropriate tension.
  8. 8 Remove the wrench and close the hood.
Thank you and good luck,
Lee

Aug 26, 2010 | 2006 Toyota Sienna

1 Answer

I have a '94 BMW 318i, the drive belt keeps falling off


if you are talking about the serpentine belt which drives the alternator / water pump etc, it may be falling off if it is miss-routed or if any of the pulleys are out of alignment or if the belt tensionr is not properly tightened, the tensioner is the pulley which bears on the outside of the belt (smooth side) this pulley may be gummed up and give you the impression it doesnt move clean it up loosen it off

May 07, 2010 | 1994 BMW 3 Series

1 Answer

HOW DO I ADJUST FAN BELT ON1998 Z3 bmw?


serpentine belts dont need adjusting they have a tensioner pulley that is spring loaded / you may need a new tensioner pulley or belt . hope that helps

Jan 30, 2010 | 1998 BMW Z3 Roadster

2 Answers

Ineed to replace the serpintine belt, mine shreded, went and purchased replacement from lordco auto parts, could not seem to get belt to tighten up could you please advise the correct belt part # as well...


There is a idler wheel that has a bolt that when loosened will cause it to spring back. As you lay under the car with your feet first inward ( looking straight up from under vehicle snake the belt through and over the pulleys then pry back with a long pry bar the idler pulley lever after loosening bolt on wheel or lever as you put the belt over the pulleys. I have done this belt on a 1999 528 i it is a unpleasant job without a diagram showing the serpentine pulley arrangement, there is a second idler pulley located slightly higher than the release locking idler pulley don't confuse the two, I would advise aquiring a serpentine belt diagram (cd repair manual on ebay motors) unless you are confident you can figure it out through trial and error.

Aug 02, 2009 | BMW 528 Cars & Trucks

1 Answer

Bmw 330d serpentine belt fitting


Hey Andy a quick was to solve your problem is to locate a similar vehicle in a car yard, go have a look at the configuration and draw your self a quick diagram whilst your there.

Sep 21, 2008 | 2001 BMW 330

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