B m w 323 i 2000-01 noise from front of engine at tne top could this be the warter pump
Possibly, but water pumps on these cars generally leak for a long time before they get bad enough to make noise.
The more likely culprit is the pulley bearing on one of the tensioners or the idler on the serpentine belt. On the e46, BMW decided not to sell some of the pulleys as separate parts, They sell only the complete tensioner assembly.
If you do your own work, I suggest the following:
1) You will want to put on fresh serpentine belts while you are working on it, so go ahead and get some before you start. On-line will be a bit cheaper than the parts store and way cheaper than the dealer. Original belts were manufactured by Continental. You say the noise sounds like it is coming from the top and the idler pulley is the highest one, so I would buy the idler pulley at the same time, it might save you time and a trip later.
2) Put the front of the car up on ramps and remove the splash shield from beneath the engine. You probably want to remove the air filter box as well to give you another pathway where you can get your hands in there to work.
3) Make careful note of the belt routes. Perhaps take a picture.. It is physically possible to put the top one one wrong such that it spins the alternator backwards.
4) With Channel Lock pliers, pull back the tensioners so you can slip the serpentine belts off the pulleys.
5) Now you can spin all of the pulleys, including the water pump, to see which one(s) are noisy. If you are lucky, you will already have the only new pulley you need (but life is not like that).
If the pulley you need is not sold separately, you MIGHT be able to save $50 or so if you can find a parts person who is willing to compare your pulley to other pulleys in the parts bins to find a match. Fresh baked cookies are useful bribes for parts people. The pulley need not be an exact match so long as it fully supports the belt and does not touch any other part.
Jan 23, 2011 |
1999 BMW 323 Series