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      11-02-2012, 12:10 PM   #1
JaSSon
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Leaking water pump on 335i?

Has anyone ever seen the water pump leak on their 335?

I've got an '07 335i e92 6MT with 75k miles on it. Last weekend I: flushed coolant, changed oil, replaced leaking oil filter housing gaskets, and replaced my damaged OE FMIC with a VRSF part. At no point in time did I tinker in the area of the water pump. Thursday on my commute to work the low coolant light came on.

I've got it up on jack stands now, and the leak is at the pump, or one of the immediately attached hoses. I've removed the 3 visible worm gear clamps, repositioned, and tightened the F out of them, and it's been reduced to a slow trickle. Has anyone seen one of the hoses fail at the the water pump, or seen the water pump itself leak? My water pump works fine, and I can hear water flow thru system.
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      11-02-2012, 02:20 PM   #2
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Near as I can tell, the brown plastic section of my water pump has a hairline crack in it.

Damnit.
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      11-02-2012, 03:37 PM   #3
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The pumps are known to go out as low as few thousands miles to over 100K miles. Its random. I think there's an updated part out, but no history that it has solved the problem.
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      11-02-2012, 04:36 PM   #4
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Quote:
Originally Posted by blingman View Post
The pumps are known to go out as low as few thousands miles to over 100K miles. Its random. I think there's an updated part out, but no history that it has solved the problem.
I've read of them failing, but not of them leaking.
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      11-02-2012, 08:30 PM   #5
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Anyway to epoxy it or JBweld it? I mean you have nothing to lose.
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      11-03-2012, 01:28 AM   #6
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Mine leaked enough coolant out for the light to come on and 300 miles later bam water pump is toast.
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      11-03-2012, 02:21 PM   #7
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I ordered a water pump/thermostat/etc yesterday. I'll do the repair next weekend. I'll just keep a couple gallons distilled water in the trunk, it'll make the repair just that much cleaner
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      11-03-2012, 04:29 PM   #8
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its really not an extremely difficult repair. Someone one who has a general understanding of auto repair can tackle this I think I spent around 3-4 hours doing it. You do need a relatively uncommon tool you need inverted torx bits to get the 3 bolts that hold the WP in place. their is a DIY that is quite useful
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      11-08-2012, 06:45 PM   #9
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Everything was pretty straight forward except for the thermostat quick disconnects. Still cant get those to let go!
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      01-10-2013, 09:57 AM   #10
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Hey Jasson, Fennix - can you let us know how it turned out? Is this a fairly straightforward DIY? Where'd you get your DIY info?

I need to replace the WP and the OFHG - is it easier to do them both at once?

thx..
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      01-10-2013, 01:57 PM   #11
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Yes it's a pretty non complicated swap its a tight space and those quick release clamps can be a bitch to actually release but their is a written DIY just follow that.
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      01-10-2013, 01:58 PM   #12
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Oh and just replace them both once the wp is out the thermo is very accessible.
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      01-10-2013, 01:59 PM   #13
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You're going to have to do the water pump eventually. May as well address the leaking water pump with a new unit since it's bound to fail.
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      01-31-2013, 01:47 PM   #14
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OFHG? I worked on it here and there across two days. The only hard part are those damned thermostat hoses.

I replaced the water pump and thermostat at the same time. They're made of similar material, so should have similar life spans.
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