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      09-19-2012, 10:48 PM   #1
RentonTDI
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Noob question on Water Pump

Quick question from a noob on water pump replacement:

I just bought a 2009 328i xDRIVE with semi-high mileage, and I'm going to be replacing the water pump, thermostat, radiator hoses, reservoir tank, and do a coolant flush.

BUT, I'm wondering if the e90 M3 water pump is compatible with this engine? And if so, is it worth purchasing over the stock water pump?


As background, I just noticed the M3 water pump on Turner's site, and it mentions an 'upgraded aluminum impeller' - I don't know if this would improve reliability...see links below.

M3 e9x water pump: http://www.turnermotorsport.com/p-55...-impeller.aspx

Regular e9x water pump: http://www.turnermotorsport.com/p-27...53-engine.aspx
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      09-20-2012, 12:42 AM   #2
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No they are not compatible. The M3 uses a mechanical water pump and the n52 uses an electrical one.
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      09-21-2012, 12:53 AM   #3
RentonTDI
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Johnny D - thanks.
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      09-21-2012, 01:36 AM   #4
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Minus the coolant flush, how much are you getting that deal for? No spark plug, coil pack change yet?
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      09-22-2012, 01:24 PM   #5
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Quote:
Originally Posted by RentonTDI View Post
Quick question from a noob on water pump replacement:

I just bought a 2009 328i xDRIVE with semi-high mileage, and I'm going to be replacing the water pump, thermostat, radiator hoses, reservoir tank, and do a coolant flush.

BUT, I'm wondering if the e90 M3 water pump is compatible with this engine? And if so, is it worth purchasing over the stock water pump?


As background, I just noticed the M3 water pump on Turner's site, and it mentions an 'upgraded aluminum impeller' - I don't know if this would improve reliability...see links below.

M3 e9x water pump: http://www.turnermotorsport.com/p-55...-impeller.aspx

Regular e9x water pump: http://www.turnermotorsport.com/p-27...53-engine.aspx
I have 140K on my vert and it runs like a top. No issues whatsoever. So far I put a set of tires and brakes on it with oil changes every 10K. I think you're blowing a huge nut for nothing.

I plan on doing a belt and plugs in the near future. Rear brakes are due again. That's about it.
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      09-22-2012, 02:49 PM   #6
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Quote:
Originally Posted by RentonTDI View Post
Quick question from a noob on water pump replacement:

I just bought a 2009 328i xDRIVE with semi-high mileage, and I'm going to be replacing the water pump, thermostat, radiator hoses, reservoir tank, and do a coolant flush.

BUT, I'm wondering if the e90 M3 water pump is compatible with this engine? And if so, is it worth purchasing over the stock water pump?


As background, I just noticed the M3 water pump on Turner's site, and it mentions an 'upgraded aluminum impeller' - I don't know if this would improve reliability...see links below.

M3 e9x water pump: http://www.turnermotorsport.com/p-55...-impeller.aspx

Regular e9x water pump: http://www.turnermotorsport.com/p-27...53-engine.aspx
Check Tischer's website. It's Getbmwparts.com. then look at their specials. I got a water pump T-Sat and the bolts for $478 shipped. There isn't really any need to replace the hoses and tank unless you see them cracking, and or leaking. If you have the extra cash and really want to go ahead, but it really isn't necessary. If you call turner with that special price they will match it. They are a great company and will help you with any thing, I didn't think of calling them before I bought mine. Hope this helps.
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      09-23-2012, 12:05 AM   #7
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Josephbet01 - I'm curious, what year is your car? Your experience is good to hear, in terms of how reliable your car has been.
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      09-23-2012, 12:06 AM   #8
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PTA85 - thanks! Good advice - good looking out.
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      09-23-2012, 09:05 AM   #9
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Route 16 - good point about plugs/coil packs. Added to my to-do list
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      09-23-2012, 12:14 PM   #10
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Quote:
Originally Posted by RentonTDI View Post
Josephbet01 - I'm curious, what year is your car? Your experience is good to hear, in terms of how reliable your car has been.
It's a 2007 328i convertible. Like I said, so far I've given it mid-grade fuel, a set of Continental DWS tires, dealer oil changes every 10k, replaced auto trans fluid, replaced rear diff fluid, replaced power steering fluid, replaced brake fluid, front brake pads and rotors and rear brake pads but reused the original rotors. Did most of that around 70k by myself just for piece of mind and changing fluids is easy. Probably overkill for sure. Wife has a 2000 corolla with 190k and never had any fluids changed - just walmart oil every 5k. Runs great.

Currently with about 140k miles I'm getting 28mpg hwy. It's ready for rear brakes again, brake fluid, spark plugs, auto trans fluid, belt, air filter, and diff fluid. I'll do the brakes and fluids myself and let the dealer monkey with the belt and plugs.

I commute 140 miles a day round trip from York PA to Columbia MD at roughly 75mph. Other than gas, tires, oil, fluids and brakes I don't put anything into it. No electrical issues. No mystery noises. I bought mine with 17k miles on it back in Aug 2009.

It's a solid car. Keep all your fluids fresh and you won't have any surprises.
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      09-23-2012, 06:34 PM   #11
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Josephbet01 - honestly, this is great to hear. I'm coming over from the WRX and VW TDI world, where maintenance and random check-engine-lights are common. I look forward to this car - with basic care/maintenance she should treat me well (minus the random stuff you can't predict).
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      09-30-2012, 07:26 AM   #12
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The electric water pump on the N52 fails because of the control electronics over heating, not the impeller. The impeller is ABS plastic (very tough) and is about the size of a half-dollar.

Read up in the maintenance section on the water pump. Find Eninty's post on it. He posted a lot of good info. The pump when it starts to fail will throw codes in the ECU. It's best you get a BMW scan tool to read codes rather than replace the pump and the entire cooling system based on a whim.
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      09-30-2012, 10:23 PM   #13
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Efthreeoh - thanks, very good guidance!

I followed your advice, and found a great thread from ENINTY, linked below. In short, if I get code "2E81 (Electrical Cooling Pump: Speed Deviation)", then replace the pump soon.

http://www.e90post.com/forums/showpo...8&postcount=40

So, I'm likely going to purchase the Bavarian Technic 'Enthusiast kit - option 1', found in link below. Although I do wonder if it will be useful for other tasks, like coding, registering a new battery, etc.

http://www.bavariantechnic.com/buy.aspx
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      10-06-2012, 09:33 PM   #14
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Efthreeoh et al,

Again, thanks for the guidance on the water pump.

As an update, I purchased the Bavarian Enthusiast Kit - Option 1, and took some readings on my Water Pump, which are shown in the screen shot below. I'm new with the tool, and basically started with:

1) Looking for any faults under "Engine" - I found no faults, which I think is a good sign. That is, I found no water pump faults such as "2E81 (Electrical Cooling Pump: Speed Deviation)".

2) Took some basic readings on the water pump while the car was idling, soon after I turned the car on (i.e., 2-4 minutes after start up). I'm not sure what to make of these readings, but I'll start tracking them and see if I can detect any sort of trend over time.

Hope to post updates over time



Last edited by RentonTDI; 10-06-2012 at 09:42 PM.
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