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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 06-02-2008, 09:32 AM
NFS NFS is offline
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Mein Auto: E39 540I
How long does a water pump last? Normally!

I replaced my water pump around 45K miles ago. Now I have a small leak with the water pump gasket. Since I have to remove the water pump in order to replace the gasket, should also replace my water pump at the same time?
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  #2  
Old 06-02-2008, 09:45 AM
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ChileBeem ChileBeem is offline
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Mein Auto: 2002 540ia MSport Tsilver
yes, get the one with the metal impeller, not plastic. the factory gaskets have a bead of silicone that seals better, and get all surfaces perfect. I use a small fine oil stone (like 3x1x0.5") to true up the pump surface before mounting. They can get dinged a little during shipping.
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  #3  
Old 06-02-2008, 09:53 AM
NFS NFS is offline
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Well, I replaced the water pump with the metal impller 45K miles ago. So you still recommend me to replace the water pump anyway.
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  #4  
Old 06-02-2008, 11:29 AM
branndon_b branndon_b is offline
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i think i would. since these cars are notorious for having cooling system gremlins, i'd just go ahead and do it. you're already gonna have to dig in to get it off anyway, hate to see you button it all back up and in another 10, 15k mi. have to do it all over again anyway. change it now or change it later, either way it's inevitable. just decide if you feel like tackling all this possibly in another 15k mi. if you could've just done it now. just my 2 cents. branndon
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  #5  
Old 06-02-2008, 11:50 AM
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Fudman Fudman is offline
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Mein Auto: '02 530i Sport auto
+1. Replace the pump since you're already in there. Your labor saves a good portion of the part cost (~$100). If it ever fails, you have a backup. It's worth the peace of mind.
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  #6  
Old 06-02-2008, 11:50 AM
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Dudesky_E36 Dudesky_E36 is offline
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I'm pretty sure they're meant to normally last 60k (yea right!), so you may as well replace it again while you're at it.
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Old 06-02-2008, 11:56 AM
Max_VQ Max_VQ is offline
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If the leak is between the water pump and gasket AND not the shaft (@ the weep hole) then change the gasket.

Once the pump is out, check the condition of the bearings (smoothness and side to side play) and re-evaluate.
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Old 06-02-2008, 12:02 PM
KTrostel KTrostel is offline
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If you get 65K to 85K out of a normal water pump you are average.

Should you replace the pump in your BMW? That depends on what your time and piece of mind are worth. What does a wpump cost - $125?? How long will it take you to replace this pump even if it lasts another year (~15K miles) vs doing the job now? If it is more than two hours, I would replace the pump now.
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  #9  
Old 06-02-2008, 12:13 PM
NFS NFS is offline
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Thanks all the for advices. I'll change the thermostat and the water pump. I guess I value my time more. Beside I am planning on keeping the car for awhile.
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Old 06-02-2008, 04:07 PM
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FJ540 FJ540 is offline
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Mein Auto: 97 540iA
Just use high tack gasket sealer when you put the new one in (use the sealer on the gasket, not in place of one). It's almost like using silicon, but it comes off easier when you need to swap the part down the road.

What I really like about it, is that you never have to mess with pinching the gasket when putting the new pump in. I bet your pump is fine, but the gasket was kinked when it was installed.

A can of it is about $3 and will last you a long time.
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  #11  
Old 06-02-2008, 09:54 PM
BBMW528i BBMW528i is offline
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Mein Auto: 09' BMW 328i; 04' BMW X5
In my experience ABOUT every 50k was normal.
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