Cool Down Pulley Particulars. (archive)

I did a little bit of research and determined that a smaller diameter pulley would do the trick for me. I installed a '92 M5 pulley on my E28 and it works very well. The E32 735i has the same M30 motor as an e28 535i so it should work for you as well. I got the pulley from the bimmer dealer for about $55.00 with BMW CCA discount.

Here's the pulley part number: 11 51 1 315 202
Belt Number: Dayco, Top Cog, Gold Label # 17395 (in other words, its 39.5 inches in circumference)

Dallas summmers are so damned hot that $55 for the pulley and $10 for a new belt are a steal for the peace of mind I get from knowing that my motor isn't likely to turn to toast. However, I'd keep an ear tuned toward the water pump. If its not been replaced in the last 30,000 miles, I'd consider doing so while you have it apart. The increased RPMs could prematurely wear out the pump and if its an old pump , probably hasten its demise. Just a thought.

Also, if you have over-heating problems, you might consider replacing the thermostat and flushing the cooling system while you're at it.

Good Luck!

Dave in Dallas
'88 535is

I would like to know can I install the M5 water pulley as it is smaller than the E32 735i, so it spins the pump faster.

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