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Old 08-11-2009, 05:59 PM   #1
Maineiac
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Default OK to run motor without serpentine belt...

...briefly, for the purpose of diagnosing a bearing (?) noise??

My Z06 makes a whining noise once the motor warms up. At first I thought it was the alternator bearing, but I had it rebuilt, and it still makes the noise. So now I am thinking power steering pump, water pump, or perhaps the bearing on the belt tensioner.

Can I run the motor briefly without the belt to see if it's the power steering pump or belt tensioner???

Any other ideas to diagnose what could be causing the noise?

TIA...
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Old 08-11-2009, 06:20 PM   #2
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No problem!! You will get DTCs and DIC Messages but you can just clear them... You can use a mechanics stethoscope to track down the noise. A length of 5/16" rubber hose with a metal rod in one end will work just as well as a store bought stethoscope Just place the metal rod on the part that you want to examine and the rubber hose in your ear. If theres an abnormal noise,,,you will hear it!!

Last edited by Bill Curlee; 08-11-2009 at 06:39 PM.
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Old 08-11-2009, 06:32 PM   #3
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describe briefly.
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Old 08-11-2009, 06:39 PM   #4
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Quote:
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describe briefly.
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Old 08-11-2009, 06:39 PM   #5
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describe briefly.
Describe WHAT briefly?????????????
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Old 08-11-2009, 06:55 PM   #6
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???? What do you want more explanation on?????????
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Old 08-11-2009, 07:20 PM   #7
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If you set the metal rod on the noise--It will blow your eardrum out-kinda--likely the tensioner went bad
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Old 08-11-2009, 07:29 PM   #8
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I think the cars needs a good beating on the track, it must miss those days and is whining like a baby. ( or is that you crying like a baby )
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Old 08-11-2009, 07:31 PM   #9
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Quote:
Originally Posted by bobby777 View Post
If you set the metal rod on the noise--It will blow your eardrum out-kinda--likely the tensioner went bad
No frigging way. I do this all the time. You dont need to cram the hose inside your ear. Just hold the hose up to your ear and listen to the hose.

You can use this method to pin point the noise down to an exact area. If you just use an OPEN ENDED hose, you can use it to narrow down noises like squeeks and vacuum leaks. It works very well.

BC
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Old 08-11-2009, 07:34 PM   #10
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To help shorten the diagnosis, run it first without the lower A/C belt.
IF there is a squeak you know it is on the main serpentine system.

IF the squeak is gone, then the issue is on the A/C belt system.
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Old 08-12-2009, 12:05 AM   #11
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I did the same thing, I didnt get any codes, lucky i guess. Didnt hurt anything. Good Luck finding that noise, i replaced every pulley, it was a pain and drove me crazy!
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Old 08-12-2009, 03:33 PM   #12
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Quote:
Originally Posted by Bill Curlee View Post
Describe WHAT briefly?????????????
i think they meant ie how long can he run it briefly - before it overheats ect from pump not spinning.
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Old 08-12-2009, 03:45 PM   #13
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Quote:
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i think they meant ie how long can he run it briefly - before it overheats ect from pump not spinning.
That depends on how quickly the car is heating up, the outside air and the temperature of the motor before startup... I'd say 15 max for a cold motor, and 5-10 minutes if the outside temps are above 70*
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Old 08-12-2009, 04:17 PM   #14
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Thanks for the input guys...I'll let ya know what I find.
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Old 08-14-2009, 03:06 PM   #15
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OK fellas....the noise is coming from the power steering pump/pulley. How do I get the pulley off...or is it part of the pump itself?

Please advise....
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Old 08-14-2009, 06:19 PM   #16
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The pulley by itself should not be making any noises unless it is not aligned with the belt.
Did you check the fluid level in the power steering reservoir?
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Old 08-14-2009, 07:19 PM   #17
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Quote:
Originally Posted by TEXHAWK0 View Post
The pulley by itself should not be making any noises unless it is not aligned with the belt.
Did you check the fluid level in the power steering reservoir?
With the belt off...I can't rotate the pulley by hand...and it is noisy..makes clicking type noise. Also has some play in it front to back.

Fluid level is fine.....


Hmmmmm......
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Old 08-14-2009, 07:22 PM   #18
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Sounds like a few dollars for a new pump to me.
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Old 08-14-2009, 07:34 PM   #19
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Sounds like a few dollars for a new pump to me.
That pump if taking a dump and will soon fail. Time for a new one.

The pully takes a special puller/installer. Its plastic and it you dont do it with the correct puller, it will break. Kent/Moore makes the one that works well.

BC
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Old 08-15-2009, 07:40 AM   #20
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Quote:
Originally Posted by Bill Curlee View Post
That pump if taking a dump and will soon fail. Time for a new one.

The pully takes a special puller/installer. Its plastic and it you dont do it with the correct puller, it will break. Kent/Moore makes the one that works well.

BC
Thanks Bill... where can I get the Kent/Moore puller? Also, does the new pump come with the pulley...or should I upgrade it to the C6 pulley, that I read is metal with holes in it to get to the pump bolts?
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