Question about 1998 Mercury Sable

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Serpentine belt keeps breaking

So serpentine belt breaks, replaced, breaks again. Replaced the tension pulley thinking that could be the problem. The belt STILL slides to the side and breaks. Any insight would be greatly appreciated. I have looked up a diagram for the correct belt positioning as well.

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Whichever pulley it is sliding off of is not straight. check the alignment of ALL the pulleys and make sure there is no play in them. They should all be solid with no wobble. My guess would be a bearing is bad allowing play in the pulley which lets the belt "walk" to the edge.

Posted on Nov 18, 2013

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Posted on Jan 02, 2017

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SOURCE: Serpentine belt in a 1995 Mercury sable




I have the same car and last night my belt slipped off. The top small pulley backed it's self out. The problem is in most cars the pulleys are reverse threaded so this wont happen, in ours not so much. The pully spins loose with the turn of the belt so it has to be tightened way down. IT's a pain. Here is a diagram I found and You need a 15mm wrench, which doesn't just come in most sets. Good Luck

The book says "Using a 15 mm socket or wrench on bolt attaching drive belt tensioner pulley, rotate drive belt tensioner clockwise. Make sure spring keeper engages into slot." I would put a socket on the 15 mm pulley bolt and a long handle for leverage. Thats one tight spring.
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Posted on Nov 06, 2008

warlock61
  • 659 Answers

SOURCE: i need a diagram of 2000 grand marquis serpentine belt

here you go

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Posted on Dec 28, 2008

  • 1 Answer

SOURCE: Mercury Topaz serpentine belt diagram

I have a 93 topaz, the diagram label is under
the hood itself.

Posted on Jul 29, 2009

matney68
  • 426 Answers

SOURCE: i need to change the serpentine belt for a 1993

I have 2 of the v-6 diagrams. the first is the 3.0 the second is the 3.8 but not SHObfd8b15.gifd1dbd38.gif

Posted on Nov 12, 2009

  • 4369 Answers

SOURCE: engine diagram for 2001 mercury cougar

4 cyl or v 6?

2.5L V-6 with air conditioning built 01/99 onwards

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Posted on Jan 22, 2010

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I just replaced my serpentine belt 1 day ago and it broke again. The repair shop said that all pulleys worked when they replaced it. So what else could it possibly be?


What does the break look like. What i mean is, the way the new belt broke will help determine what is wrong with it. My educated guess will be that the serpentine belt tensioner is siezed. this is what applies pressure to the pulley.
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Hope this helps:

Removal & Installation
  1. Remove the air cleaner outlet pipe.
  2. Rotate the drive belt tensioner clockwise and remove the drive belt.

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Rotate the drive belt tensioner clockwise and remove the drive belt



To install:

  1. Installation is the reverse of the removal procedure. Make sure the belt is routed properly

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Accessory serpentine belt routing-Ford 4.6L, 5.4L, and 6.8L engines with A/C



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Accessory serpentine belt routing-Ford 4.6L, 5.4L, and 6.8L engines without A/C



Please let me know if it's diesel because the routing is different.

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Other than something like that, I think it would have to be the tensioner not doing it's job.

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