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Jerry, Master Mechanic
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Experience:  ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
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1997 s320: the allen bolt on the clutch..threads..reverse

Resolved Question:

to remove the allen bolt on the center of a 1997 s320 fan clutch are the threads reverse or standard?
Submitted: 7 years ago.
Category: Car
Expert:  Jerry replied 7 years ago.

Hello and welcome to Just, Super mechanic here. About your vehicle.


You will want to turn it to the left to take it out. Here are the steps.


NOTE: Numbers in parentheses ( ) indicate a component or tool in the associated illustration.


  1. Remove fan shroud.





  1. Fit on wrench (7) 120 58914 07 00, or equivalent, at bolt of viscous fan clutch.
  2. Fit on torque wrench (8) 001 589 72 21 00, or equivalent, with head in wrench (7) removed.
  3. Fit on counter-holder (1) 120 589 02 01 00, or equivalent.
  4. Slacken bolt (4) of viscous fan clutch (3).
  5. Turn wrench (7) with handle (a).
  6. Unscrew bolt (4).
  7. Remove viscous fan clutch (3) together with fan (2) and bolt (4).
  8. Unbolt viscous fan clutch (3) and fan (2).
  9. Reverse procedure to install, noting the following:
    • As a result of cast rib, fan (2) can only be installed on one side.
    • Tighten the fan to viscous fan clutch bolts to 10 Nm .
    • Tighten the viscous fan clutch bolt (4) to bearing body to 45 Nm



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