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How do you check if crankshaft pulley or idler pully is bad

Wobble from belt that goes from ac to idler pully to crankshaft pulley, how do I check which pully might be bad? belt is tight I can see wobble while running and noise

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: noise from front of motor

Yes the idler pulley can make noise, but not very common. It can do it though.

Posted on Jul 24, 2008

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ewashmidas
  • 362 Answers

SOURCE: Serpentine belt routing

Here you go.. I looked up the same belt you did, it should be right.

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Posted on Feb 09, 2009

  • 4088 Answers

SOURCE: 1999 dodge durango 5.9 v8 loud squealing noise

You didn't mention the alternator, power steering pump, or water pump. In fact, any pulley other than the crankshaft one can have a bad bearing or dry seal. Remove the belt and spin each pulley while listening for any rough noise or squeal. If it was the crankshaft, it might be time to check the oil. Start the engine with the belt off to see if it does squeal. Make sure the noise isn't coming from the radiator fan(s).

Posted on Nov 17, 2009

  • 454 Answers

SOURCE: On a 2002 Grand Prix, have a serpentine belt and

serpentione belt sounds as if it is stretched. first try to reseat serpentine belt. if still a problem then go buy new belt at autozone. also buy some belt dressing. this should fix the problem. if this doesnt solve then you need to buy a new idler arm. relatively easy fix.

Posted on Feb 01, 2010

ftw1952
  • 10319 Answers

SOURCE: I can't get the crankshaft damper pulley off.

Download this link and find your Service manual for your vehicle. It will serve you well and to keep for future reference

http://ezinearticles.com/?Find-the-Free-Auto-Repair-Manual-You-Need-Online&id=92717

Posted on May 02, 2010

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2 Answers

I have a 1989 jeep wrangler it does not have a serpentine belt but rather 3 belts i need a diagram showing how those belts are suposed to be routed


Check with Autozone and discuss your problem. They know what they are talking about and have always come up with the right parts or belts for me. I used to be a mechanic in my youth and I never go anywhere else.........

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Replaced alternator on 1993 Plymouth Grand Voyager with a 3.3 engine and AC. Within less than a hundred miles, the serpentine belt broke. Replaced the serpentine belt and now when I turn the car on and run...


The tensioner is the only thing that will make a clicking sound, caused by the spring in it. But this doesn't mean that it is bad. To check pullies , remove the belt and turn them. they should spin freely. Turn them slowly also, if you feel any roughness then they are worn out. Do this to everything the belt touches, Alternator, a/c , power steering. Also the pullies should not wobble.

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My 1998 Caravan has a bad squeek in the belt system. Have replaced tensioner pully twice, replaced idler pully and bearings, replaced cerpentine belt twice, replaced alternator twice, went back to...


Without the belt do all the pulleys turn easy. Power steering, water pump, alternator, and tensioner pulley. There is probably only one way the belt will stay on but make sure you have the smooth side to the smooth pulley and the grooved side to the grooved pulleys. See if any of the pulleys have and wiggle in them.

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What would make a Malibu's belt shred like to to the point where all the strands were not together?


something is not aligned correctly, or one of the pulleys have spurs/chipped. Hope this helped Tim

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


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.

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Jun 06, 2010 | 1996 Saturn SL

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Belt fell off?


chances are there is a pully lose and the belt walked off, what i would do is check all of the pullys and makes sure there is no movement on any of them.

Oct 30, 2009 | 1994 Dodge Caravan

1 Answer

Serpentine belt slips off idler pulley


The A/C pully is supposed to spin freely until the AC is activated to run.. The cranshaft pully does not. Replace the tensioner pully. The belt has to fit in between the grooves on the pullys.

Apr 05, 2009 | 1994 GMC Suburban

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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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