macreel

Guy deterrents:

Hairy warts, just about anywhere;
Beer bellies (a 'unisex' deterrent);
Unshaven body hair (an 'old fuds' deterrent);
$3 a gallon perfume;

Just for starters, Thom1.

Nicole

Well, Beth, it souonds like that makes replacing the belly pan a "pain in the forehead" then... Just kidding!

Thanks all for the good advice on visiting Harbor Freight. The tobacco sounds even too gross for me, so that might not work. Warts and bellies don't grow and go fast enough. Hunchback walk, blackened tooth, and cheap perfume might be options - I assume I'd have to use that whole gallon at once to make this work, right?

The only disadvantate is that this would eat up all the savings I'd make at this place. Maybe I'd better drive to Pep Boys in one of the neighboring towns instead. There I could study the art of ricing and get a free summer fashion show by the rice owners' girlfriends.

OK, serious again:

Bill came over tonight, and used a hose to isolate the noise. We found the clicking to come from the AC clutch, when the clutch is not engaged. No noise from the air pump.

So, the question is whether that clutch and its bearings can be replaced whtout removing the compressor, or at least without evacuating and refilling the system. Any ideas?

Bill Ball

Nicole:

It appears this should be a pretty easy job:

http://www.nichols.nu/tip738.htm

John Struthers

Hmmmm,
Well Nicole, battle of the insensitve sexes aside...
I have a similar complaint and still can't isolate the sounds -2 each- one is no rmp sensitve the other is.
I figured with all of the suspension front end, brake work I did a couple of month ago along with a TB retension that I had:
1. Clicking sound; Should have taken EVERYBODY's advice and rebuilt the
TB tensioner. Though I can't isolate the sound to the tensioner proper???
2. The light metallic scraping sound; Possibly bent the rotor shield?
Checked, O.K. Rust on rotors? Nope. repacked wheelbearings loose or tight, or not seated properly? Nope. Wheel out of round? Nope.
Bleed the brakes again too, no joy and it's not a lifter or, injector.
I guess I'll wander down to the A/C clutch compressor area since I was assuming the A/C had to be on to develope a sensor click -I never use mine-.
Nicole, in your case... when was the last time the system was serviced/charged?
I realize that with the noise present (A/C off) the servicing should not be an issue but I'm just curious.
BTW Were you implying that your sHARK was GREASY?

Nicole

I believe I have a different AC compressor than John Pitman's 83 Euro, and my understanding is that the bearings are not available as a Porsche spare part. They'd have to be sourced from a different vendor. The shop manual shows the components of the compressor, but is not specific to the specs of any of these parts.

John:

The system was serviced about two years ago and works perfectly, except for the noise. That's why I'd hate to evacuate and recharge it.

I use my AC all the time. In fact, I rarely drive with the windows or even the sunroof open! It would not make a difference for me, whether the car has a sunroof or not! I set the AC to work as an air curtain as it was designed to be used, and get very little draft but a very comfortable climate. I love the system - when it works!

To locate the noise, Bill used the flexible hose from my shop vac, and stuffed the one end down to where the AC compressor is. Once he got it close, we could hear an almost hammering noise. Of course, we did this with the car idleing in the garage - it's a lot harder to do with noises that only appear while one is driving...

rob rossitto

if it's a bearing, the belt might jump a bit or a pulley might wobble, so run the motor w/the hood open (be careful) and watch for erratic belt/pulley activity...

could just be a loose/bent cover or fan shroud...might be worth putting on some rubber gloves (to keep clean hands) and try moving stuff around (motor off 1st, of course)...

guy turn-off? just go into harbor w/your arm over another gal and give all the guys dirty looks, like SHE"S MINE AHOLE!! should keep'em in line for a while...

have fun!

Nicole

Fellow rennlister tuk_928 alerted me of the following from the June 2004 Panorama Magazine, page 93 (Tech Q&A). While the answer does not apply in my case, it might be helpful for someone else trying to track down clicking / ticking noises:

928 1987-1995 ticking noise: The car starts and runs fine but it makes a sound from the engine compartment like that of a diesel. This seems to have started after a trip to FL and back. All the fluids are fine and it doesn't seem to lack any performance, it just sounds bad. Any suggestions?
JOHN VENINGER (928 tech committee replies): I'm guessing you're having something of a loud clicking noise. Many problems can cause this type of noise --- lifters, valves, injectors, and even and exhaust leak. The more common cause of the sound is the hydraulic lifters. Your injectors also click, but not usually at the level (dB) which you describe. Make sure your oil level is good and that you're running good quality oil in the 5w50 or 15w50 range.
The oil check valve in one or both cylinder heads might be clogged. This will cause tapping when the car is first started. You will need to remove the cam covers and clean these check valves. Once you remove the cam cover, the cleaning is a fairly simple process.

Garth S

As an 'addendum' to the clicking/tapping noises arising from lifters, that is why a liter of one's favourite solvent or oil additive is sometimes added to the oil for an interval prior to changeout. ATF, Rislone, kerosene, ..., can serve to soften or dissolve the crud that can accumulate in orfices and check valves: If that doesn't work, out with the wrenches and into the valve covers.

John Veninger

Hi Nicole,

I finally replaced the A/C bearing on my 90 this past winter. It would "scratch" while the car warmed up.
My bearing was a bit loose, but the other cause may be a build up on the A/C clutch surface.

You can remove the clutch and bearing while the compressor is in the car. Clean the surface of the clutch and pulley and slide in a new bearing. I listed the new bearing number on the forum a few months back. It's less than $20.00.
Total time to do the job is about an hour, including the belly pans.
An air ratchet or impact is helpful to remove the clutch nut. You'll also need a snap ring plier to remove the bearing.

Want to try a quick test? Spray some water on the A/C clutch while its running to see if the noise changes.

MikeN

John -

Could you please post the number / source of the A/C clutch bearing you speak of? Tried the search, but did not find it. I have the same symptom you had on your car.......a slight scratch until it warms up.......coming from either the A/C clutch or air pump.......now I'm thinking more towards the A/C clutch. Going to tackle it soon!

John Veninger

https://rennlist.com/forums/showthre...hreadid=109664

MikeN

Thanks John.......