bearing noise s70 - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > PAG Vehicle Discussion > Volvo
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 04-18-2005, 07:01   #1 (permalink)
My_roller2000
Guest
 
Posts: n/a
bearing noise s70

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.

  Reply With Quote
Sponsored Links
Advertisement
 
Old 04-18-2005, 07:01   #2 (permalink)
Michael Pardee
Guest
 
Posts: n/a
Re: bearing noise s70

"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


  Reply With Quote
Old 04-18-2005, 07:01   #3 (permalink)
jr
Guest
 
Posts: n/a
Re: bearing noise s70

Michael Pardee wrote:

> "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
>
>

The noise is present with the ac off, I actally did not try listening
with the ac on as I figured the bearing was in motion even with it off
as the belt is turning the pully on the ac, I realize the ac clutch is
not engaged so other ac internal parts are not turning.

I will look into the "mechanic's stethoscope" and see if that helps.

thanks for the suggestion and quick reply too.
I look forward to other suggestions also.
  Reply With Quote
Old 04-18-2005, 09:02   #4 (permalink)
Mike F
Guest
 
Posts: n/a
Re: bearing noise s70

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.)
  Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > PAG Vehicle Discussion > Volvo



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 23:56.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.