Question about 1999 Mercury Mountaineer

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1999 merc mountaineer,

Upper idler pulley was replaced and squeals now

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Check if there is any obstruction in the path of the pulley or the belt is too tight or this may not be correct one get it fixed by using a correct belt.............

Posted on May 29, 2008


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Tensioner bolt bottoms out on idler pulley (belt for Poly-V A/C & Idler) on 2000 Nissan Pathfinder SE

Pulleys also wear.
You've changed the belts - a workshop would then change that particular pulley, if asked to do so.

Start your engine, then put a few drops of water onto that pulley. Does the squealing noise disappear? If so, the pulley is slightly worn in the groove - and this happens to all vehicles.

Your option is to either replace that pulley or use a spray-on anti squeal compound.

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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.

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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).

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Major electrical problems, and then some...

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