Early Production car P/S tension pulley diameter

[m3s65b4.x]

2 BMW E9X M3 A/C Belt Tensioner Pulley Only = INA 5320557100
2 BMW E9X M3 Alternator Belt Tensioner Pulley Only = INA 5320342100

Checked engine belts @87.000km and replaced P/S route deflection pulley (worn out) and tension pulley (too much side play) so 2 of 2.
ALT pulley was in good condition.
Tension pulley diameter is 70mm, exactly same as Alternator tension pulley, when all sources indicate P/S must be 65mm.
Is it really came this way from factory. I don't know, no reason previous owners mess with this as mileage was only 40.000 miles (67.000km)

Installed 70mm pulley but probably better replace 65mm and maybe tensioner itself stays in better position. If all 3 pulleys are original and ALT pulley ok, but P/S pulleys not, there something little bit off.

Next time w'll drain coolant and remove some pipes to help pull out fan+shroud easily. Can't squeeze enough that hose between oil filter case and fan.

[nick3753]

Early production pulleys were both 70mm.

Read through this thread for more info:


https://www.bimmerpost.com/forums/sh...php?p=27883249

Edit: maybe I’m wrong.

From FCP euro:

https://www.fcpeuro.com/blog/how-to-...sioner-pulleys

“BMW E90 M3 Belt Tensioner Assembly & Replacement Pulleys

Power steering and A/C compressor tensioner pulley - p/n 11287838196 (Up to 5/15/2008) - Use INA 5320557100 (OE# 059903341G) - 65mm x 26mm
Power steering and A/C compressor tensioner pulley - p/n 11287838194 (From 5/15/2008) - Use INA 5320342100 (OE #11281440237) - 70mm x 26mm
Alternator and water pump tensioner pulley - p/n 11287841527 (Used on all E9X M3's) - Use INA 5320342100 (OE #11281440237) - 70mm x 26mm”