These next few pages attempt to graphically demonstrate the Plumley Procedure for
rehabbing Porsche 928 mechanical fan clutches. The one shown below is from my
1979 and it typical of the earlier model fan clutches. Keep in mind this fan clutch is
slightly different from the one described in the Plumley Procedure. However the basic
principles of the repair procedure still apply. A write up of this procedure is in the new
928 International catalogue or on the Greg Nicols 928 Maintenance & Tip Site
The fan/clutch assembly from my 1979 928
The first thing I did is remove the air intake tubes from the upper
fan shroud and then unbolt the (2) 10 mm
bolts holding the upper fan shroud to the radiator shell and lower
fan shroud
I lift straight up and out
Next, I removed the (3) 13 mm bolts holding the fan bracket to the motor.
There are (2)
on top and (1) below hidden from view by the bracket. You may want
to use a 13 mm open
end wrench because there isn't much clearance between the pulley and
the ratchet with the
socket attached. I was able to get it with a 1/4 ratchet w/13 mm socket.
I then removed the
fan belt belt off the pulley and lifted the fan out of the engine compartment
I took approximately 10 minutes to do all this.
Wow! Look at all that room
Good time to try out my new Jay Kempf timing belt tension check tool.
I can even tighten the oil pan bolts I could not reach when I did the oil change.