In Reply to: Big six Water Pump posted by Patrick F. on May 29, 1999 at 22:55:01:
That 13mm head bolt is regular right hand threads.
Hold the water pump pulley with LARGE channel lock type pliers and use the longest 13mm wrench you have to crack it loose.
Once you get the bolt off you have to deal with 4 small bolts holding the water pump nose assembly together.
Usually small allen bolts, 5mm I think.
Welcome to what all E-23 seven series owners who haven't upgraded their water pump and fan clutches go through when changing the water pump.
Most 5&6 series cars didn't get this style. Is the car an older 533i model?
Put anti-seize on everything, plan on those little allen bolts being seized and use a chisel or vise-grip pliers to remove any bad ones.
Be really CAREFUL about lining the drive tang of the nose pc up with the fan clutchs' mating tang.
If you don't get this right you will only think the assembly is tight and it falls off into the radiator going down the road since the tang and corresponding slot weren't put together.
Use a good light and look forward of the fan clutch to see if the inner sleeve is sticking out.
If it is you didn't the fan clutch sleeve into the water pump nose pc.
you can practice with the feel and look of a correctly assembled fan clutch when you have all the parts out of the car.
You will see what the correct position of the parts are this way instead of just hoping.
Take your time and use the anti-seize, once you do this right it's almost as fast as the 32mm left hand fan clutch assembly.
OK, maybe not that fast.