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      04-10-2019, 12:40 PM   #1
DarthColin
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Water Pump

Hi everyone, my 1M left me on the side of the road for the first time two days ago, due to water pump failure.
I was 2 km from home when the amber engine overheat warning appeared. While wondering if I could limp the rest of the way home, the red warning came on five seconds later. I promptly pulled over and shut down. There was coolant in expansion tank area, and in right front wheel well.
I had it flat decked home, then flat decked to the dealer the next day.
When the codes and faults were checked, there was "coolant pump sticking" and "coolant pump shut down" faults. The pump is worth $800 Canadian in case you're wondering. Yikes.
Here's a few pictures:
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      04-10-2019, 04:15 PM   #2
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How many miles?

I have seen 60k as a recommended replacement mileage even with no problems for this very reason. I will likely do it next winter when I expect to be close to 55k since I track the car.
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      04-10-2019, 04:49 PM   #3
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Yeah common issue. We don't see it as much because we don't drive as much but e90s, 135 and 128s get it. You might as well replace radiator hoses and thermostat as you do that too.
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      04-10-2019, 05:36 PM   #4
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My car has north of 143000 km. Service adviser said very common. He said common pump assembly for N54, N55 engines. I suspect other engines as well. Had the pump in stock, and mentioned that's because they frequently pack it in at this age, or earlier.
The impeller and housing are made of plastic, hence why it wears. I kept the old pump. Maybe I'll make a disassembly video.
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      04-10-2019, 08:49 PM   #5
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Quote:
Originally Posted by CarJunkie View Post
How many miles?

I have seen 60k as a recommended replacement mileage even with no problems for this very reason. I will likely do it next winter when I expect to be close to 55k since I track the car.
5 or 6 years of 60k miles. it's an electric water pump so it just has a certain lifespan.
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      04-11-2019, 11:34 AM   #6
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Quote:
Originally Posted by 10" View Post
Quote:
Originally Posted by CarJunkie View Post
How many miles?

I have seen 60k as a recommended replacement mileage even with no problems for this very reason. I will likely do it next winter when I expect to be close to 55k since I track the car.
5 or 6 years of 60k miles. it's an electric water pump so it just has a certain lifespan.
Yep, normal wear item. Preemptively replaced my at around 60k. Should be considered routine maintenance.
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      04-11-2019, 04:32 PM   #7
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Mine lasted 166,000 miles before giving it up.
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      04-11-2019, 06:53 PM   #8
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Mine only lasted about 55,000 kilometres
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      04-11-2019, 08:36 PM   #9
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Quote:
Originally Posted by Yellowceta View Post
Mine lasted 166,000 miles before giving it up.
You need to post up in the "Most Miles" thread with a pic of the odometer!
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      04-12-2019, 09:18 PM   #10
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On my N55 135i, the water pump, OFHG and charge pipe all went out between 40k-44k miles. Bring on the HPFP!

On my Porsche 996, the water pump went out at about the same mileage, too!
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      04-15-2019, 01:58 PM   #11
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Quote:
Originally Posted by duder13 View Post
On my N55 135i, the water pump, OFHG and charge pipe all went out between 40k-44k miles. Bring on the HPFP!

On my Porsche 996, the water pump went out at about the same mileage, too!
Sometimes I think Germany should've stuck with air cooled!

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