bearing noise s70

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CarGuru > Volvo > bearing noise s70 18 April 2005 17:50:11

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bearing noise s70
My_roller2000 18 April 2005 16:23:16
	Hello, I am hearing a knocking - tapping noise that sounds like it is coming from one of the accessory items. The AC compressor, alternator, PS pump, are my primary suspects. I have tried touching these items while the engine is running to see if I can narrow it down and I can not reach the AC compressor and can not distinguish between the others. These parts are so close to each other and are mechanically bolted to virtually the same place it is hard to tell where the sound is coming from by feel. The idler and tensioner are possible too, but the noise seems to be more forward than those parts. The car has about 130K miles on it and this is the first of any these parts to give any trouble. It is a 98 model year. My question is what are the best ways to narrow down the problem ? I don't want to guess or use the shotgun method and replace them all, as all the parts seem pretty expensive and it is a tight place to work. To get to the alternator out, for instance, looks like the PS pump must be removed from the car to get to the alternator, hope there is an easier way if the alternator has to be replaced. I would guess the AC compressor might be possible to access from below? Funny thing is that, for now, everything seems to be working fine. I don't want to let this go and have it strand me at the side of the road. Thanks for all suggestions and help.
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Michael Pardee 18 April 2005 16:37:58 [ permanent link ]
	"My_roller2000" <My_roller2000@yahoo.com> wrote in message news:4263A6B4.D4208074@yahoo.com...> Hello,> I am hearing a knocking - tapping noise that sounds like it is coming> from one of the accessory items. The AC compressor, alternator, PS pump,> are my primary suspects. I have tried touching these items while the> engine is running to see if I can narrow it down and I can not reach the> AC compressor and can not distinguish between the others. These parts> are so close to each other and are mechanically bolted to virtually the> same place it is hard to tell where the sound is coming from by feel.> The idler and tensioner are possible too, but the noise seems to be more> forward than those parts. The car has about 130K miles on it and this is> the first of any these parts to give any trouble. It is a 98 model year.> My question is what are the best ways to narrow down the problem ? I> don't want to guess or use the shotgun method and replace them all, as> all the parts seem pretty expensive and it is a tight place to work. To> get to the alternator out, for instance, looks like the PS pump must be> removed from the car to get to the alternator, hope there is an easier> way if the alternator has to be replaced. I would guess the AC> compressor might be possible to access from below?> Funny thing is that, for now, everything seems to be working fine. I> don't want to let this go and have it strand me at the side of the road.> Thanks for all suggestions and help.> I am dubious it is coming from any of those items, although the PS pump is a possibility. The A/C compressor is actually a very strong suspect except for something you didn't mention: does the tapping go away when the A/C is off? If so, you've found the source, otherwise, look farther. When disengaged the A/C compressor just presents a bearing to the rotation. The bearing could have a broken ball, but those usually result in intermittent jamming of the bearing. Just about the same with the alternator; knocking-tapping doesn't square well with the mechanics of it. The P/S pump could certainly do it, but I'd be reluctant to shotgun it. Auto parts stores (and Sears) sell a "mechanic's stethoscope" that fits a metal rod to a stethoscope earset to help in finding noises like this. My experience is that metallic sounds seem to be everywhere, but at $20 US or so it might be your wisest approach at this point. Mike
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Mike F 18 April 2005 17:50:11 [ permanent link ]
	My_roller2000 wrote:> Hello,> I am hearing a knocking - tapping noise that sounds like it is coming> from one of the accessory items. The AC compressor, alternator, PS pump,> are my primary suspects. I have tried touching these items while the> engine is running to see if I can narrow it down and I can not reach the> AC compressor and can not distinguish between the others. These parts> are so close to each other and are mechanically bolted to virtually the> same place it is hard to tell where the sound is coming from by feel.> The idler and tensioner are possible too, but the noise seems to be more> forward than those parts. The car has about 130K miles on it and this is> the first of any these parts to give any trouble. It is a 98 model year.> My question is what are the best ways to narrow down the problem ? I> don't want to guess or use the shotgun method and replace them all, as> all the parts seem pretty expensive and it is a tight place to work. To> get to the alternator out, for instance, looks like the PS pump must be> removed from the car to get to the alternator, hope there is an easier> way if the alternator has to be replaced. I would guess the AC> compressor might be possible to access from below?> Funny thing is that, for now, everything seems to be working fine. I> don't want to let this go and have it strand me at the side of the road.> Thanks for all suggestions and help. Remove the accessory belt, start the car and see if the noise has gone away. If it has, manually spinning the accessories, idler and tensioner may indicate which one is bad. -- Mike F. Thornhill (near Toronto), Ont. Replace tt with t (twice!) and remove parentheses to email me directly. (But I check the newsgroup more often than this email address.)
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CarGuru > Volvo > bearing noise s70 18 April 2005 17:50:11

	see also: effects of late timing ? Strange tire wear		pass tests:		see also: 1997 HONDA ACCORD ENGINE MISFIRE ON 1… 99 jeep grand cherokee just won't start BMW 325ic convertible top re-engage…

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bearing noise s70

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