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#1
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Squeal under the hood
Hello
I have a 95 318ti and it has recently developed a squeal under the hood that only occurs after the engine has warmed up. I have about a 20 minute drive from work and it starts up quiet but by the time I get home it sounds like there is a flock of birds under the hood. I tried to find the source of the sound but I can't pinpoint since it seems to come from everywhere. I'm sure its either a belt or tensioner pully but which one would be silent when cold but start making noise when hot? Thanks Joe Fugazzi |
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#2
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Joe Fugazzi wrote: > > Hello > > I have a 95 318ti and it has recently developed a squeal under the hood that > only occurs after the engine has warmed up. I have about a 20 minute drive > from work and it starts up quiet but by the time I get home it sounds like > there is a flock of birds under the hood. I tried to find the source of the > sound but I can't pinpoint since it seems to come from everywhere. I'm sure > its either a belt or tensioner pully but which one would be silent when cold > but start making noise when hot? > > Thanks > > Joe Fugazzi Start by changing the belts and saving the used ones for an emergency, it cannot hurt and will illuminate one potential cause. You could try spraying some belt dressing, but if the belts have been polished, it is just better to change them out. As for an answer to your question, there is a list of things that may be causing the squeal, inclujdung bet not limited to: old/hard belts, bad tensioner, bad bearings in any of the belt accessories. bad water pump, cracked mounting plate on the alternator, airlock in the cooling system. JJ |
#3
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Of the two, I would suspect the idler pulley bearings getting hot.
Replace the belt, and while it is off, check the idler pulley, it should roll smoothly - if a little bit tight. It is rolls too easily, or has any roughness, it needs to be replaced. Of course, you can take the idler off too, and take it with you to the Parts Counter you like to visit, and compare the feel of the old one with the feel of a new one. I suspect that your '95 idler pulley is worn out by now. "Joe Fugazzi" > wrote in message ... > Hello > > I have a 95 318ti and it has recently developed a squeal under the hood > that > only occurs after the engine has warmed up. I have about a 20 minute drive > from work and it starts up quiet but by the time I get home it sounds like > there is a flock of birds under the hood. I tried to find the source of > the > sound but I can't pinpoint since it seems to come from everywhere. I'm > sure > its either a belt or tensioner pully but which one would be silent when > cold > but start making noise when hot? > > Thanks > > Joe Fugazzi > > > |
#4
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"CRWLR" > wrote:
>Of the two, I would suspect the idler pulley bearings getting hot. > >Replace the belt, and while it is off, check the idler pulley, it should >roll smoothly - if a little bit tight. It is rolls too easily, or has any >roughness, it needs to be replaced. Of course, you can take the idler off - snip defnitely an idler pulley or the like... symptoms exactly the same in my wifes car ( volvo, but pretty much the same when it comes to this) noise was so loud it was hard to pinpoint. if it was the water pump, that makes a lower grinding noise. keith |
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