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The belt on my 2002 Mazda 3000 keeps coming off even after putting new idler and tensioner pullys on it and new water pump?

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  • 68 Answers

U need to measure the crankshaft and cam run-out and check all ur pulleys if the keyway isn't damaged

Posted on Apr 27, 2015

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  • 253 Answers

Sounds like the pullys are not lined up or one has a defect

Posted on Apr 27, 2015

  • Danny Tucker
    Danny Tucker Apr 27, 2015

    Its running up on the the edge of fan pulley and tensioner pulley.

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SOURCE: Serpentine belts keeps shredding

would help if i knew what car it was ,main cause of this problem is one of the plastic wheel/tensioner is faulty if you look carefully then you will that it should have a guide like a train wheel with a falnge on either side and one or both of these flanges have broken away so the without the guide the belt runs on the edge of the wheel and it shreds .not the first time i have seen this

Posted on Dec 08, 2011

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SOURCE: after changed a new water pump,timing belt,idler pully,tensioner for 2004 lexus ls 430, when start engine has a noise look like from pully

COULD BE A BAD BEARING IN THE IDLER PULLY OR THE TENSIONER ON THE TIMING BELT OR THE SERPENTINE BELT. IF ITS A SQUEEL IT MAY BE SOME COOLANT GOT ON THE SERPENTINE BELT. TRY TO WASH THE BELT WITH WATER AND LET DRY COMPLETELY. IF NOISE REMAINS RETURN TO THE SHOP THAT DID THE WORK.

Posted on Jul 17, 2012

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1 Answer

My mazda protege keeps breaking alternator belts. I've put on serval alternator belts, a new water pump pulley, and 3 alternators and my is still breaking belts


Replace belt tensioner, any other pullys, I worked on ? vehicle where the pully would spin but would stop every so often.

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Why dose my serpentine belt keep sliding off on my 2003 trailblazer


Aaron did you recheck the belt tension within 30 days after the installs?Me personally I pop the hood an have look see make sure it won't fly apart on me !

Nov 16, 2015 | 2003 Chevrolet TrailBlazer

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2002 Dodge Ram 1500 Squealing engine area noise


Have your water pump and power steering pump been eliminated as the possible cause of the noise?

Oct 16, 2012 | Cars & Trucks

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After changed a new water pump,timing belt,idler pully,tensioner for 2004 lexus ls 430, when start engine has a noise look like from pully


COULD BE A BAD BEARING IN THE IDLER PULLY OR THE TENSIONER ON THE TIMING BELT OR THE SERPENTINE BELT. IF ITS A SQUEEL IT MAY BE SOME COOLANT GOT ON THE SERPENTINE BELT. TRY TO WASH THE BELT WITH WATER AND LET DRY COMPLETELY. IF NOISE REMAINS RETURN TO THE SHOP THAT DID THE WORK.

Jul 17, 2012 | Lexus LS 430 Cars & Trucks

2 Answers

Keeps throwing the belt off


I had the exact same problem, except it was shredding the belt as well. It even jumped off the pully after just distance down the road. Come to find out the idler (which had been changed out with what was "supposed" to be the right one) was the wrong one. It looked right, but after changing the idler out we have not had this problem again.

Jul 03, 2009 | 1991 Ford F150

1 Answer

Belt inst


For the 3.0L Vulcan, you have a tensioner that is located just below the power steering pully. Use a 15mm wrench or the 15mm shallow well socket that comes in a Serpentine Belt tool to push the tensioner toward the rear of the engine compartment. Take the old belt off and route the new belt. The belt begins at the crankshaft pully, goes under and around the a/c compressor, up around the power steering pump, around (with the flat edge) the idler pully, around the alternator, the flat edge then sits against the tensioner and back around to the water pump pully. You should have a belt routing diagram on the underside of the hood just above the serpentine pully assembly.

Jun 23, 2009 | 1999 Ford Taurus

2 Answers

I HEAR A LOUD WHINNING NOISE FROM UNDER THE HOOD


Yes there is a bearing in the AC clutch assembly, and the bearing can be changed with out swapping out for a whole new AC compressor unit or even taking the unit out. 
The other thing to you may want to check is the Serpentine belt tensioner. The tensioner then to break apart and or when the clutch activate put's more pressure on the system and the idler pully bearing could alsy be the problem. 
Spray some water on the fan belt whale the engine is running and see if the noise goes away and comes back as the water dry's. If the noise goes away then it's just a worn belt and need to be changed or you may want to do the quick fix and buy Fan belt dressing. 
Good luck and hope this helps

Apr 09, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Cant put on belt right


from front of engine looking back,belt around bottom of crank pully,water pump is just above,left side of belt comes around water pump going counter clock wise,put belt over alternator,then straight across to a/c compressor,(make sure belt goes under any idler pullies,smooth side of belt to smooth side of pully)find your belt tensioner,pry back on tensioner(be carefull)and carefully place belt under roller pully of the tensioner,release and check allignment of belt prior to starting.oh ya make sure belt is in good condition.

Mar 01, 2009 | 1991 Chevrolet C1500

2 Answers

How do i change the fan belt


well has soon as you loosen and take out the alt the belt will become loose then put alt on it will slide down to put belt around and then pull up on alt and tighten it up

Jan 25, 2009 | 1988 Mazda B2200

2 Answers

Serpentine belt installation


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} 1 To replace a worn belt, locate the idler or generator pulley.
2 Loosen the hold-down fastener for the idler or generator pulley.
3 Pry the idler or generator pulley inward to release the belt tension and remove the belt.
4 Match the old belt up for size with the new replacement belt.
5 Observe the belt routing diagram in the engine compartment.
6 Install the new belt over each of the drive pulleys. Often the manufacturer recommends a sequence for feeding the belt around the pulleys.
7 Pry out the idler or generator pulley to put tension on the belt.
8 Pry out the idler or generator pulley to put tension on the belt.
9 Install the belt squarely in the grooves of each pulley.
10 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.”
11 Pry the idler or generator pulley to adjust the belt to specifications.
12 Tighten the idler or generator pulley fastener.
13 Start the engine and check the belt for proper operation.

Jan 10, 2009 | 1998 Ford Escort

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