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      11-03-2018, 03:18 PM   #1
First Lieutenant

Drives: E36 M3
Join Date: Aug 2014
Location: Phila

iTrader: (0)

Idler Pulley Replacement - Tip

I mentioned this in the other post, however if you don't read until the end of the post, you may miss it. Hopefully it helps someone....

The idler pulley near the water pump with either the offset or centered hole (depending on build date), that is rather inexpensive at $25-$30. However, the two tensioner pulleys are hella expensive because they don't sell the pulley separately ($160 & $185). I did manage to pull those two apart afterwards. Each tensioner uses the same pulley.

Measured Pulley Dimensions -

1. OD - 70mm
2. ID - 16.95mm
3. Width - 26mm

Dayco has two pulleys listed -

Pulley #89144 -
OD - 70mm
ID - 17mm
Width - 25mm


Pulley #89133
OD - 70mm
ID - 17mm
Width - 24.5mm

Both said they can be used for 6 rib belts. They list for ~$25 on Amazon. This may be a cheap alternative than replacing the entire assembly which isn't needed.

Appreciate 0