912 Manual Replace Cooling Blower

Parts List

fan_pn Parts diagram of the fan and associated plates.

Remove and Installing Cooling Blower

The detachable generator carrier permits withdrawal of the generator and blower impeller assembly without removal of the entire air blower housing. The work procedure is as follows:


912_fig_62 Remove the strap and bolts holding the fan to the shroud.
912_fig_63 Remove the generator from the stand.


The installation is accomplished in reversed order of the above by noting the following points:

  1. Properly connect generator cables (brown cable to Terminal D-, black cable to Terminal DF, red cable to Terminal D+).
  2. Insert new gasket between the generator carrier and timing gear cover.
  3. Check for proper V-belt alignment between the generator and crankshaft pulleys and correct be repositioning the generator in its cradle; however, make certain that no tension is created between the blower housing cover and the blower housing when the retaining screws are tightened.

Removal and Installation of the Cooling Blower Fan

Special Tools

P 42 Torque wrench, or

VW 118 Torque wrench

P 44 Hex socket. 36 mm, for P 42,


912_fig_64 Diagram of the fan installation to the generator shaft.

  1. Remove air blower.
  2. Mount generator in a vice by fastening it by the pulley spindle through plastic or aluminum grip protectors.
  3. Unscrew the special impeller nut and withdraw impeller together with its back shield.


  1. Note the proper arrangement of spacers.
  2. Position impeller shield.
  3. Tighten the special impeller nut to 10 mkp (72. 3 lbs/ft).
  4. The clearance between the blower housing cover and impeller should be approximately 3 mm (1/8 in.).
  5. When turning, the impeller should not strike the housing cover.
Last modified: Mon, 17 Jan 2005


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