N52

whiskeY11 · 07-15-2023, 05:36 PM

So, recently I started to notice that there is a small coolant leak on my BMW. I immediately thought: "okay, probably some crappy plastic coolant hose is gone, easy job".
Today, I laid under the car to inspect the hoses and found nothing. Radiator and all plastic hoses are perfectly fine. Then, as a last resort, I looked to the only NON-PLASTIC hose in the engine, which goes from water pump to engine block. And there I saw this:

Does this mean that this whole pipe assembly has to be replaced? If you look closely, you can see blue stains of coolant. From what I have read, there are almost no issues with this pipe so I must be special lol

chilledn52 · 07-15-2023, 05:42 PM

Would expect it to the gasket for it.. 11537534880 OEM number.
EDIT: and possibly this o-ring too 11517514942

StradaRedlands · 07-15-2023, 07:36 PM

The O-ring and gasket on that pipe can potentially let go. I've pulled a few of them at the wrecker, and they were all flattened and disintegrating when I pulled them.

whiskeY11 · 07-16-2023, 03:33 AM

I was thinking about these gaskets as well, but the coolant seems to be sipping from the welds of the pipe. I dont know if its possible for that pipe to crack or its just those gaskets.. One guy on Youtube had exact same symptoms and he replaced the whole pipe. It took him 3 days do its definetly not a job I want to do twice

07-15-2023, 05:36 PM	#1
whiskeY11 Registered 0 Rep 4 Posts Drives: BMW E90 325i N52B25 Join Date: Jun 2023 Location: Europe iTrader: (0)	N52 - Is my engine coolant inlet pipe cracked? So, recently I started to notice that there is a small coolant leak on my BMW. I immediately thought: "okay, probably some crappy plastic coolant hose is gone, easy job". Today, I laid under the car to inspect the hoses and found nothing. Radiator and all plastic hoses are perfectly fine. Then, as a last resort, I looked to the only NON-PLASTIC hose in the engine, which goes from water pump to engine block. And there I saw this: Does this mean that this whole pipe assembly has to be replaced? If you look closely, you can see blue stains of coolant. From what I have read, there are almost no issues with this pipe so I must be special lol
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07-15-2023, 05:42 PM	#2
chilledn52 Parts Pro 144 Rep 176 Posts Drives: 2007 BMW 328xi 6MT Join Date: Sep 2022 Location: Alberta iTrader: (0) Garage List 2007 BMW 328xi [10.00]	Would expect it to the gasket for it.. 11537534880 OEM number. EDIT: and possibly this o-ring too 11517514942 __________________ E90 328xi 6MT \| Intake Scoops \| K&N + Charcoal Filter Delete \| DIY Dinan 3in \| 3.25in + 3.5in piping \| N54 Manifold \| MILVS \| Ceramic Coated Headers \| Secondary Cat Delete \| Xdelete \| 3.91 Diffs \| 22RPD Tune
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07-15-2023, 07:36 PM	#3
StradaRedlands Brigadier General 6568 Rep 3,915 Posts Drives: 2006 BMW 330i MT Join Date: Dec 2021 Location: SoCal iTrader: (3) Garage List 2006 BMW 330i [8.45] 2009 BMW 328i Touri ... [8.00] 2013 BMW X5 35i [7.80] 2011 BMW 528i [8.70] 2006 Mazda3 [5.50]	The O-ring and gasket on that pipe can potentially let go. I've pulled a few of them at the wrecker, and they were all flattened and disintegrating when I pulled them.
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07-16-2023, 03:33 AM	#4
whiskeY11 Registered 0 Rep 4 Posts Drives: BMW E90 325i N52B25 Join Date: Jun 2023 Location: Europe iTrader: (0)	I was thinking about these gaskets as well, but the coolant seems to be sipping from the welds of the pipe. I dont know if its possible for that pipe to crack or its just those gaskets.. One guy on Youtube had exact same symptoms and he replaced the whole pipe. It took him 3 days do its definetly not a job I want to do twice
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