Question about 2005 Mercury Mountaineer

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Replaced the serpentaine belt , the idler pulley and the belt tensioner now the belt is loose any suggestions

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The most glaring possibility is whether or not it is the correct belt. I like to lay the old one out next to the new one to verify that they are identical in length. Did the old belt squeal and then break? If so, something was trying to lock up. If something other than the idler pulley was going bad, you may still have a squealing belt because it can't pull the "bad" unit. I recommend you take the belt off verify that it is the correct belt. If so while the belt is off, inspect every pulley on the belt circuit. Each pully, except the crankshaft, should turn freely and have no wobble play at the bearings. If any components have a grinding feel to them when you turn the pulleys, it needs to be replaced.
Good luck, hopes this helps you.

Posted on Sep 12, 2010

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Unless something has bent this should not be an issue. The only other time I have run into something like this is when the tension is not correct on the belt. If that doesn't have the spring loaded tension pulley you will find an adjustment on the alternator bracket. If it does have a spring loaded system then you need to replace that spring in the tension arm.

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My serpentain belt was changed, new everything was put on 3 times but still after a week the sqeeking comes back


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What makes a belt squeak?


Belts squeak for the same reason tires do when they spin. They are slipping. Something isn't turning as fast as the belt wants it to. On ford it's usually ether the idler sprocket or the tensioner. If you remove the belt and try spinning all of the pulleys by hand.( note the crank wont spin freely) you will usually be able to tell witch ones slipping.

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I have changed all the pulleys except for my A/C pulley on my 2002 chevy tracker 2.0 liter engine. The serpentine belt has been changed at least 8 times over the last 5 years. i changed to pulleys in...


REPLACE THE TENSIONER IDLER PULLEY.THE TENSIONER IDLER PULLEY MAINTAINS THE BELT TENSION WHEN IT GOES BAD.THAT WILL LEAD TO LOOSE BELT TENSION CAUSING BELT TO BREAK.

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1 Answer

Replace serpentine belt



Removal & Installation

  1. Rotate the drive belt tensioner clockwise and remove the drive belt.
    WARNING Never suddenly let go of the tensioned idler pulley. The force of the spring pressure suddenly released may damage the idler pulley mechanism. Always release the spring pressure gradually.


    0996b43f80204f01.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Rotate the belt tensioner to relieve tension on the belt-4.6L engine shown, others similar


To install:
  1. Route the belt over the pulleys making sure all the grooves in the pulleys and the belt line up correctly. Refer to the accessory belt routing section of this manual.
  2. Rotate belt tensioner clockwise and slip drive belt over idler pulley on tensioner.

  1. Rotate the drive belt tensioner clockwise and remove the drive belt.
    WARNING Never suddenly let go of the tensioned idler pulley. The force of the spring pressure suddenly released may damage the idler pulley mechanism. Always release the spring pressure gradually.


    0996b43f80204f01.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Rotate the belt tensioner to relieve tension on the belt-4.6L engine shown, others similar


To install:
  1. Route the belt over the pulleys making sure all the grooves in the pulleys and the belt line up correctly. Refer to the accessory belt routing diagrams above.
  2. Rotate belt tensioner clockwise and slip drive belt over idler pulley on tensioner.
If for any reason, the tensioner is crooked, replace it!!! Also, install the belt with the writing facing you like you are trying to read a book. This WILL (a trick I learned at Mercedes) prevent even a new belt from squeeling!!

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Timing belts are supposed to be replaced in intervals, on this vehicle every 60,000 miles. The timing belt may look good, but they mostly stretch over time. As for the looseness and becoming tight, its because there is different compression tension that pull either way. But to be loose to the point you can spin the tensioner pulley, replace everything (belt, tensioner, idler pulley, water pump)!!

Sep 27, 2010 | 1998 Mitsubishi Montero Sport

3 Answers

The drive belt keeps coming off of the tensioner everytime it rains or snows. We have replaced the Tensioner and the belt and made sure the splash cover is on under the van. Please help!!!!!


Something may be out of line in the belt path, an idler pulley that has a bad bearing, or one of the pumps or the alternator is trying to seize-up. Remove the belt and check each pulley that the belt travels over for bearing looseness or rough turning. When the belt is reinstalled, check that the belt seats on each pulley properly. Test it by directing water from a hose while the engine is running--you should only have water thrown off in all directions. Good luck!

Feb 10, 2010 | 1998 Dodge Grand Caravan

1 Answer

1996 Grand AM 3.1L serpentine belt replacement


Try this procedure.
0900823d8004ed44.jpg


To replace a worn belt, locate the idler or generator pulley.

0900823d8004ed45.jpg


Loosen the hold-down fastener for the idler or generator pulley.

0900823d8004ed46.jpg


Pry the idler or generator pulley inward to release the belt tension and remove the belt.

0900823d8004ed47.jpg


Match the old belt up for size with the new replacement belt.

0900823d8004ed48.jpg


Observe the belt routing diagram in the engine compartment.

0900823d8004ed49.jpg


Install the new belt over each of the drive pulleys. Often the manufacturer recommends a sequence for feeding the belt around the pulleys.

0900823d8004ed4a.jpg

Art courtesy of Delmar - Thomson Learning.
Pry out the idler or generator pulley to put tension on the belt.
Pry out the idler or generator pulley to put tension on the belt.

0900823d8004ed74.jpg


Install the belt squarely in the grooves of each pulley.

0900823d8004ed75.jpg


Before adjusting belt tension, check for proper pulley alignment. This is especially critical with serpentine belts. Measure the belt deflection in its longest span. If a belt tension gauge is available, use it and compare the tension to specifications.
If a belt is too tight, wear to bearings for the water pump, alternator, and engine crankshaft can result.
Some late-model Chrysler engines require a torque reading to be taken when tension is applied to the generator drive belt. This is especially important on the longer, multiribbed V-belts.

0900823d8004ed76.jpg


Pry the idler or generator pulley to adjust the belt to specifications.

0900823d8004ed77.jpg


Tighten the idler or generator pulley fastener.

0900823d8004ed78.jpg


Start the engine and check the belt for proper operation.

Any more questions please ask. Good luck.

Jan 24, 2009 | 1996 Pontiac Grand Am

1 Answer

Squeaking noise front drivers side of engine


Loosen the belts [ you do not need to remove] so they are free of tension to all pulleys.Start engine , if noise goes away either belts were too loose [ common on lx 450] or you have a worn & noisey pulley /bearing.have seen idler pulley below alternator have dry / noisey bearing.Otherwise if idler is ok it has to be another belt driven assessory , ac clutch,water pump & or fan clutch.Good Luck.

Jan 17, 2009 | 1997 Lexus LX 450

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