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Cooling Fan Belt Replacement
 
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Pelican Technical Article:

Cooling Fan Belt Replacement

Steve Vernon

Time:

30 minutes30 mins

Tab:

$5 to $15

Talent:

**

Tools:

5mm Allen

Applicable Models:

Porsche 993 Carrera (1995-98)
Porsche 993 Carrera 4 (1995-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)

Parts Required:

Belt

Hot Tip:

Make note of the washer placement

Performance Gain:

Proper cooling of the engine

Complementary Modification:

Change the other belts

The 993 is the last of the great air cooled 911's. The older Porsche's use a single belt to run both the cooling fan and the alternator. As displacement increased and there became higher demands on the electronic systems, Porsche designed an independent pulley system for the 993 alternator and cooling fan. The alternator fan pulley is smaller; meaning it will spin faster at idle to provide for the demands of the electrical system while the cooling fan pulley is designed to place the correct volume of air over the motor for the entire RPM range.

There are three belts on the 993 engine that drive the A/C compressor, the alternator and the cooling fan. The A/C compressor belt is the outer most belt and needs to be removed to replace the other belts. These belts like any belt will wear out over time. You should inspect all of your belts every six months for signs of drying out, glazing, cracking or separation and replace them at the first signs of deterioration.

Over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please leave your vehicle information.

There are three belts on the 993 engine that drive the A/C compressor (blue arrow), the alternator (red arrow) and the cooling fan (yellow arrow).
Figure 1

There are three belts on the 993 engine that drive the A/C compressor (blue arrow), the alternator (red arrow) and the cooling fan (yellow arrow).

You will need to remove the A/C belt to replace the alternator belt so please see our article on A/C belt replacement for additional assistance.
Figure 2

You will need to remove the A/C belt to replace the alternator belt so please see our article on A/C belt replacement for additional assistance.

Next you will need to remove the alternator belt so please see our article on that procedure.
Figure 3

Next you will need to remove the alternator belt so please see our article on that procedure.

With the other two belts removed you can remove the cooling fan belt.
Figure 4

With the other two belts removed you can remove the cooling fan belt. Use a 5mm Allen and remove the three bolts holding the outside pulley (red arrows).

Remove the bolts and count the shims.
Figure 5

Remove the bolts and count the shims.

Slide the outer pulley half off.
Figure 6

Slide the outer pulley half off.

Count and remove the shims (red arrow) between the pulleys.
Figure 7

Count and remove the shims (red arrow) between the pulleys. There should be seven shims total

Remove the belt off the upper pulley and then remove the inner pulley to clean and inspect it.
Figure 8

Remove the belt off the upper pulley and then remove the inner pulley to clean and inspect it.

There will be a cooling belt sensor on the bottom left side of the fan, this sensor tells you if the cooling fan belt lets go.
Figure 9

There will be a cooling belt sensor on the bottom left side of the fan, this sensor tells you if the cooling fan belt lets go. Simply slide the wheel (red arrow) back towards the housing and slip the belt off the crank pulley. If the sensor is broken please see our article on cooling belt sensor replacement. Installation is the reverse of removal. Begin by placing the shims in the same amount and places they were when you remove the belt, tighten everything up and run the engine for a few minutes. Check the tension and there should be 5mm deflection and the midway point using finger pressure. If you need to adjust the tension add or subtract shims from between the pulleys.

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