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kayzrx8 kayzrx8 is offline
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Default N54 water pump - 11-22-2016, 12:30 PM

Hi, I am new to the forum. I tried asking this over on the e90post forum and did not receive a response.

I have a 2008 335i with an N54 engine that has had the water pump replaced 2 times due to the impeller housing cracking and leaking coolant. I'm currently having the same issue again. Does anyone know if the water pump from the f32 435i , which has the same electrical plug from what I can tell and also has a metal impeller housing, will work as a replacement pump? I understand the fitment is different but I can fabricate another way of attaching it or even relocating it to get this to work. I am an engineering and have access to a machine shop.

I just need to know if the electrical specifications and pin-out of the connector is the same for both pumps or is the pump a completely different motor internally that this swap wont work.

The first time the pump failed it had me stranded on the turnpike for 4 hours. Second failure luckily was caught in my driveway. This failure now has my car stuck at work. I would hate to buy another n54 pump to have it fail again. Any suggestions would be appreciated.

Here is the 435i pump


https://www.ecstuning.com/b-genuine-...p/11518635090/

here is the one in the 335i n54


https://www.ecstuning.com/b-genuine-...p/11517632426/

Thanks,
Ken
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Nanometer Nanometer is offline
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Default 11-22-2016, 02:48 PM

Thousands of people on here use the stock n54 water pump. I Think someone looked into getting an improved version or something like that a while back, cant remember the resolution on that. But anyways, look for the root problem. I think think switching to a different part is going to fix your issue, even if it does fit. I have had my water pump for 91k, and have had no failures. whatever the failure is, its probably not the waterpump causing it, and i doubt a new rev of pump will fix it.


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suspenceful suspenceful is offline
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Default 11-22-2016, 03:02 PM

I'd be curious as well.

My 2nd pump with about 30-40k miles on it cracked the housing again. The pump itself worked fine too. Sucks.


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kayzrx8 kayzrx8 is offline
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Default 11-22-2016, 03:03 PM

The pump motor and impeller is completely fine. Its the housing of the pump impeller that is getting hairline cracks and leaking. this was the issue for the first and second failure. Replacing with a metal housing or a different pump with a metal housing will solve the problem. No codes are being triggered for the pump. My car has over 90,000. first pump went out at 56,000 second at 92000 and this one now at 110000. First pump was replaced under warranty. Second pump was a genuine oem bmw part purchased from ECS . I run BMW coolant and the thermostat radiator reservoir and all hoses were replaced at 92000. The car has never overheated and runs fine. So yes,changing out this weak point on the pump will help. Alot of these pump fail around 90,000. I do have a JB4 with an mhd backend flash.
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J.J4ck0wsk1 J.J4ck0wsk1 is offline
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Default 11-22-2016, 03:16 PM

Are they using the correct bolts? I heard this may happen if the wrong bolts are used. I believe they are longer or shorter on the newer revision, so reusing the old original bolts won't work. Doubt this is the issue, but may be a possibility.


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kayzrx8 kayzrx8 is offline
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Default 11-22-2016, 03:20 PM

The bolts were changed each time. They are one time use aluminium bolts. Im pretty sure its just from the heat degrading the composite housing. Same thing happened to my e46 coolant reservoir tank and radiator. That fiberglass plastic stuff doesn't hold up under pressure and heat.
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J.J4ck0wsk1 J.J4ck0wsk1 is offline
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Default 11-22-2016, 03:54 PM

Yeah strange my original pump made it about 60k and the one I have now has been on for about 30k and still doing fine it seems. What's your climate type like btw?


08 E92 335i Alpine White On Coral Red 6 Speed
BMS DCI+Aquamist METH Kit+MHD+VRSF+AR25 Resonators+HPF IC+AA CP+AA BOV+SSK+KWV1+Mfactory SMFW+550i/335is Clutch+BBS LM Reps+Diff Brace+M Performance Shift Knob+RB PCV+HPF OCC+NGK
Mustang Dyno: 426whp/484wtq on E30/Meth/Stock Inlets+Outlets/Procede Only @ 18psi
Current Estimate: 450/500 on E50 Custom EDC Tuning MHD Flash @ 21psi
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kayzrx8 kayzrx8 is offline
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Default 11-22-2016, 04:07 PM

Im in Orlando Florida. Hot and humid weather.
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J.J4ck0wsk1 J.J4ck0wsk1 is offline
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Default 11-22-2016, 04:17 PM

Well **** I'm out of ideas I'm on the east coast of Florida and by the looks of it if my pump doesn't make it to 120k at least I'll be disappointed, but I feel that it will..


08 E92 335i Alpine White On Coral Red 6 Speed
BMS DCI+Aquamist METH Kit+MHD+VRSF+AR25 Resonators+HPF IC+AA CP+AA BOV+SSK+KWV1+Mfactory SMFW+550i/335is Clutch+BBS LM Reps+Diff Brace+M Performance Shift Knob+RB PCV+HPF OCC+NGK
Mustang Dyno: 426whp/484wtq on E30/Meth/Stock Inlets+Outlets/Procede Only @ 18psi
Current Estimate: 450/500 on E50 Custom EDC Tuning MHD Flash @ 21psi
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Default 11-22-2016, 05:03 PM

with my experience the clamps are being over tightened when installed, or there is excessive pressure building up in your cooling system.


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Aaron Aaron is offline
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Default 11-22-2016, 06:35 PM

The water pump is a known problem, and it is the crappy housing. I have no idea if the electronics are the same, but I'd encourage you to try it.
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vitan vitan is offline
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Default 11-23-2016, 04:27 AM

Quote:
Originally Posted by Aaron
The water pump is a known problem, and it is the crappy housing. I have no idea if the electronics are the same, but I'd encourage you to try it.
+1


07 335i
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Default 11-23-2016, 06:38 AM

The pumps are made by VDO. Changes and revisions have been made over the years, but they are still made of plastic housing. As coolant heats and cools it stresses the plastic. Usually it's the impeller inside that freezes or breaks. Electric motor.
In my experience they last around 80-90k miles. Swap when you get the yellow warning.
I am sure tunes shorten their life as they have to work harder to cool the engine, but I doubt there are any metal alternatives available. It's part of the TCO along with myriad other issues.


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kayzrx8 kayzrx8 is offline
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Default 11-28-2016, 09:24 PM

Thanks Guys for all the help, My radiator cap is new so I don't think the pressures are getting out of control. Im going to order a used 435i pump off eBay just to see if the internals and electrical specs are the same. Ill keep you guys posted.
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kayzrx8 kayzrx8 is offline
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Default 11-30-2016, 08:23 AM

Found out the pin out of the n54 pump. thanks to gatorb8 on another forum:

E9X N54 from 9/2007

Pin 1 OR - Power from Fuse F37 30Amp (Junction Box) (Relay trigger power)
Pin 2 VI - To DME Control Module Pin 26 (Relay trigger ground, ground provided by DME when pump on is requested)
Pin 3 RT - Power from Fuse F07 40Amp (Fuse carrier engine electronics) (Motor power)
Pin 4 BR - To Ground X6455 (Motor Ground)

Pin 2 is pwm to control pump speed. Waiting on the specs of the 435i pump to test out. Started drawing up a bracket on solidworks to get milled. If anyone knows the pinout of the 435i pump let me know, it would help out a lot. Thanks

Last edited by kayzrx8; 11-30-2016 at 08:27 AM.. Reason: missing info
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Ryno79 Ryno79 is offline
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Default 07-06-2019, 09:20 PM

Quote:
Originally Posted by kayzrx8
Found out the pin out of the n54 pump. thanks to gatorb8 on another forum:

E9X N54 from 9/2007

Pin 1 OR - Power from Fuse F37 30Amp (Junction Box) (Relay trigger power)
Pin 2 VI - To DME Control Module Pin 26 (Relay trigger ground, ground provided by DME when pump on is requested)
Pin 3 RT - Power from Fuse F07 40Amp (Fuse carrier engine electronics) (Motor power)
Pin 4 BR - To Ground X6455 (Motor Ground)

Pin 2 is pwm to control pump speed. Waiting on the specs of the 435i pump to test out. Started drawing up a bracket on solidworks to get milled. If anyone knows the pinout of the 435i pump let me know, it would help out a lot. Thanks
Just wondering how it all went im lookinf at doing the same with my car ive been through 5 waterpumps in 2 years
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kayzrx8 kayzrx8 is offline
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Default 07-07-2019, 08:23 AM

I had to take apart the pumps and swap the controllers . The 435i pump would run non stop on max speed . It's not a plug and play solution.
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