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I am completely flummoxed by this noise I am getting in my 2004 Turbo Cab.  A couple nights ago while driving home with the top down, I noticed a rattle different from the normal sound of the motor and not accelerating/decelerating with changes in engine RPM.  It occurred at 1800-2000 rpm and was most noticeable when decelerating in 2nd gear in my neighborhood at slow speeds (~20MPH)...  with a helper on the throttle and the engine compartment open, it sounds like it is coming from the right side-top of the engine, around the Hydraulic reservoir.  Putting a spanner/wrench on the component and up to the temple seems to have confirmed this as the source.  I checked my manual and the Pentosin level (mid range on the HOT side of the dipstick at operating temp)  I realize that Porsche recommends checking at 20C but I live in Texas now and that won't happen until November.  Just out of curiosity I looked at the clutch reservoir up front and after removing the gooey trim cover, found it leaking (Seeping) from the recently replaced cap and appearing to be overfilled.  The car has never really been operated in the 8 years I have had it in particularly high average temperatures, so I am hoping that the front is thermal expansion.  Any thoughts on this matter are greatly appreciated... Loren?  What Say You??


Thanks in advance,


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Could be worn out or the bearing got dry and then was likely damaged by running the pump dry.

I have seen a few of the PS units lose fluid and then seize up or worse start a fire.

best remove the belt and check for wobble and smoothness - of all pulleys.

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Fluid transfer and overflow to the front reservoir is typically a slave cylinder issue. 

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Take a turkey baster and suck  some of the brake/clutch fluid out of the reservoir to return it to a normal level....then keep an eye on it.

Agree with Loren completely.  If the power steering pump is making a rattle noise, remove the serpentine belt and check the pulley for play and smoothness.  Check all the other pulleys as well, including the water pump.  Good time to put on a new serpentine belt and replace the air filter.

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Agree with all.  Checked the Pentosin this morning and fluid level in the PS reservoir is spot on.  I'll pull some fluid out of the front reservoir and keep a closer eye on that.  I think I may be getting the start of a slave cylinder issue again (replaced at 30,000-ish miles, now have ~58K on the car) as I have a little creak that I can feel in the clutch pedal.  I'll pull the air box and check all the pulleys and advise with what I find.  Thanks everyone!

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Odd. A Porsche clutch slave cylinder should last a lot longer than 30,000 miles. Unless I'm misunderstanding, neither the clutch nor the power steering has anything to do with engine speed ... in 2nd gear.


With the car at a standstill and the engine running, do you hear anything when the steering wheel is turned full lock in both directions? Likewise, when depressing the clutch?



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To avoid confusion, I think there are two different issues... disregard my thoughts on the slave cylinder for now...  separate issue (if it even is an issue).  Drove the car a few miles at low RPM this morning and the clicking is most noticeable in 2nd gear when the clutch is engaged and the car is moving.  For whatever reason I think 2nd gear provides the right engine RPM and vehicle speed speed so the wind noise and engine noise are low enough to hear the clicking or rattle.  Even then it is very difficult to discern.  I have been able to recreate it while stopped with the clutch in (disengaged), but it appears to go away when the clutch is disengaged and the car is moving, like if I were stopping at a stop sign...  Got the air box off and am waiting for the compartment to cool down before I pull the belt and check the pulleys.

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