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BMW 3-Series (E90 E92) Forum
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Water Pump Survey - Died or Not?
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View Poll Results: Is your original water pump dead or alive? at what mileage? | |||
Still working; < 60,000 miles | 188 | 27.53% | |
Replaced with least than 60,000 miles | 73 | 10.69% | |
Still working; 60-75,000 miles | 88 | 12.88% | |
Replaced between 60-75,000 miles | 49 | 7.17% | |
Still working; 75-90,000 miles | 85 | 12.45% | |
Replaced between 75-90,000 miles | 45 | 6.59% | |
Still working; 90-105,000 miles | 54 | 7.91% | |
Replaced between 90-105,000 miles | 17 | 2.49% | |
Still working; 105-120,000 miles | 28 | 4.10% | |
Replaced between 105-120,000 miles | 18 | 2.64% | |
Still working; 120,000+ miles | 21 | 3.07% | |
Replaced with greater than 120,000 miles | 17 | 2.49% | |
Voters: 683. You may not vote on this poll |
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03-11-2013, 03:34 PM | #89 | |
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BTW the pumps for the N52 and N54 are different parts. The P/Ns are: 11517586925 (N52) and 11517563659 (N54). Just for the record. Last edited by Efthreeoh; 03-12-2013 at 06:17 AM.. |
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03-11-2013, 07:24 PM | #90 |
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Does having the additional BMW water cooler installed affect the pump's performance at all.
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03-11-2013, 07:30 PM | #91 |
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basically what your graph is saying.. as your drive more (higher mileage) equal higher probability of Water pump failure.. but what about the people who flushed their coolant did that make any difference?
What can prevent the water pump failure? What about the replacement pumps are they any better? Also what about the reliability of the t-stat (did people only saw WP failure only)? <= this is important because folks tend to change t-stat at the same time (to save future labor cost) but is it really required?
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03-11-2013, 07:58 PM | #92 | ||
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The second plot give the probability of failing before a particular mileage is reached. There is still a lot of error, but obviously your chance of having a failure increases the more miles you drive. Some people have had their pumps last well over 120k miles, but not many... Quote:
Once you pass 60,000 miles, it's probably best to make sure you have money stashed away in case you need to replace. (of course, always the case with any car) The vast majority of people have the WP fail before the t-stat, and as you said, replace the t-stat. They do occasionally fail, and do you really want to spend money and time tearing down again for what is a relatively cheap part relative to the labor required? I will personally replace it when the time comes.
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03-12-2013, 06:16 AM | #95 | |
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03-12-2013, 04:11 PM | #96 | |
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Good to know. Will an inefficient cooling system or "old" coolant result in more heat load on the pump electronics? Or does the heat originate externally from the engine block/exhaust and not from the coolant fluid?
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03-16-2013, 11:22 AM | #97 |
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Updated stats
I have compiled initial statistics based on 210 responses so far.
This gives the failure probability and the +/- 95% confidence intervals for that failure rate. Obviously, we need more data points to get more confidence, especially at higher mileages. Keep voting! Also, there will likely be a skew towards more failures given that many people with healthy water pumps may not check out the thread. Plot of estimated failure rate during specific mileage intervals: Plot of estimated failure rate before a specific mileage (perhaps more interesting to some of us): (I didn't really propagate the uncertainty correctly, so the uncertainty is probably larger at higher mileages)
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03-20-2013, 11:55 AM | #98 |
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bump
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03-20-2013, 01:19 PM | #99 |
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To be honest, even though I appreciate the effort here, I don't understand what the point is..
Second chart says that, as the part gets more use, the probability of it failing increases. Well we know that. Also, there is major 'undetermined' bias in the population of the data, where we don't know who we are not hearing from and who we really are hearing from (driver/maintenance etc habits, part specifics such as which cnc it was built in - long story there but I have seen failures of identical parts being produced in multiple cnc's and having different life due to placement of the cnc in the factory (i.e. exposed to afternoon sun or not). So no offense or anything but unless the sample size is near 1% of N52s I would not draw any conclusions. Btw, I am at 113k and no failure yet. Cheers. |
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03-20-2013, 02:39 PM | #101 |
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I think there is a simple conclusion and you do what you want with it;
There is a high level of probability to have a water pump failure after 70-100 k and the impact is very important. So, spending 350-400$ and a few hr to change the pump as prevention is not a bad idea. At the end, you decide if you want to take the risk.. |
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03-20-2013, 09:33 PM | #102 | ||
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It is unfortunate that there is some population bias, as in the people most likely to view the thread are ones searching for "water pump". There is also the so-called enthusiast bias, but whether that has a significant effect on pump life is questionable. But it is what it is, and it is about the best we can do in such a setting as this. I agree that we are likely getting over-estimates of the failure rate in the bins where we have a reasonable amount of data. I view this more of an educational exercise and a curiosity for these very reasons. Regardless, it is interesting to know that I may only have a 30-40% chance of getting more than 100k miles on my water pump. Knowing this, I should reasonably expect a failure and should have educated myself on the warning signs/what to do (and educated my wife who often drives the car). I would have liked to design the survey with many factors, but it is hard enough to get a reasonable number of response as is... What can I say, I'm a data person, even if it is flawed. Althought flawed data in the wrong hands can be more dangerous than anecdotal evidence, I still prefer it. Quote:
Ultimately, it sucks that there is a reasonably chance of getting stranded by a failure like this during the normal ownership period.
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03-21-2013, 11:12 AM | #103 |
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Agreed. Now what would be cool is if you were able to collect some data besides mileage and try and build a predictive model. I am a data person as well. I appreciate the effort.
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03-21-2013, 11:44 AM | #104 | |
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03-25-2013, 10:16 AM | #107 |
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111,000 and still working as of last Wednesday.
It's being replaced now as a preventive measure. |
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03-25-2013, 11:25 AM | #108 |
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03-25-2013, 11:36 AM | #109 |
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me too... the more i read the more paranoid I get lol
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