In Reply to: Big six Water Pump posted by Patrick F. on May 29, 1999 at 22:55:01:
: My fan is secured to the water pump with a single bolt through the center, NOT via the reverse threaded 32mm nut between the fan and the pulley. Does anyone know whether or not this 13mm bolt is reverse threaded into the pulley or not?? I am having some troubles breaking it loose...
I have not come across a fan on the e28 to be bolted direct to the waterpump.If it is,then your cooling system is overdoing it's job ie cooling when it is not necessary.There should be a viscous coupling between the fan and the waterpump.The fan should only pull air when the engine gets heated up enough,not all the time.
As for the 13 mm bolt,seeing that it is the one securing your fan to the waterpump,than it should be a left hand threaded bolt,designed not to unloosen itself as the fan rotates.