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Old 06-25-2007, 01:30 PM   #1
tim330i
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Join Date: Dec 1969
Location: Boston
Posts: 11,167
My Ride: 03 Ti Silver M3
UUC Under Drive Pulley Set DIY (instructions & pictures)

Here is the install of my UUC Under Drive Pulley Set (details here). UUC includes a set of instructions that are rather good but not perfect.

** Use this at your own risk **
There are several different variations depending on what tensioner you have, if you have manual or auto, etc. This is a general GUIDELINE, you will probably have some differences for your own install. For reference I have an 01/01 production 2001 330i sport manual.

1. Find the torque screw on the left side of the radiator and remove it. - I have an aftermarket intake so I don't have any of the standard air box ducts on the front. If you have this in place you need to remove that first.


2. Remove the plastic pin from the other side of the radiator. I have a cool screwdriver pry tool that I used.


3. Remove the wiring connectors and slip the wires out of the holder on the fan.


4. Pull the fan up and out.


5. Loosen the 4 10mm bolts on the water pump (while the belt is still on).


6. Loosen the 3 13mm bolts on the power steering pump (while the belt is still on).


7. Remove the cap on the A/C belt tensioner.


8. Use a torque socket to twist the tensioner to relieve tension on the belt. While the tension is off the belt slip it over the pulleys and remove it.


9. Remove the cap on the main belt tensioner.


10. Use an 8mm allen socket to twist the tensioner to relieve tension on the belt. This takes a lot more force than expected. I had to use a pipe on the end of the ratchet. While the tension is off the belt slip it over the pulleys and remove it.
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