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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 11-01-2009, 01:30 AM   #1
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Location: Buffalo, NY
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My Ride: 2002 330ci
Question water pump replacement, please help!!!

Okay, I know there are a lot of threads on here about replacing water pumps but I canít find one on how to replace it on a 330ci 2002. If Iím going to replace the water pump what else do I need to replace while Iím in there and what tools will I need? I have a noise coming from under my hood that after multiple responses people say I need to replace the idler pulley and the tensioner. I donít know what these are and how to find them on my car to know if I need hydraulic tensioners or not. If anyone can point me in the right direction that would be great. I would like to do all the upgrades I can at one time with in this system because Iím sure the parts are the original. I know that I have to upgrade and Iím willing to do that but I just need some help on how and what to do it. This car is my dream car and I want it to last. Please help!!!
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Old 11-01-2009, 07:36 AM   #2
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How many miles you've got should determine how much of your cooling system you change out. If you're approaching 100k I'd recommend changing it all.

Water pump replacement: http://www.bmw330ci.net/maintenance/completecoolant.php

Tensioner etc replacement: http://forum.e46fanatics.com/showthread.php?t=439006
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Old 11-01-2009, 12:03 PM   #3
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if you are doing the water pump you should replace hoses and sensor and expansions tank. getbmwparts.com has a kit fro $300

the tensioner and pullies is also a upgrade kit to the hydraulic for around $150 add a couple of belts and you'll be set for the rest of the cars natural life. You'll spend about $500 but I bet you'll be saving more than $1000 over what the dealership would charge.
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Old 11-01-2009, 11:28 PM   #4
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Thanks for the help. I went to the bmw330ci.net site for the water pump but they dont have directions for automatic trans. Does anyone know of a site I can use to remove a water pump for an auto trans?
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Old 11-02-2009, 12:46 AM   #5
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water pump is the same regardless of the transmission. Autos just have a mechanical fan instead of an electric one that you have to remove from the water pump first. It takes a 32mm wrench and is reverse threaded.
--1995 E36 M3--2001 E46 325i--2008 E90 335i--

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