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Old 05-16-2007, 07:28 PM   #1
DustenT
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Default IMPORTANT: Two plastic cooling system parts that WILL break.

I've seen way too many threads asking about these parts, so I'll create a new thread and make it a sticky.

Please note: If you haven't replaced these parts, they will crack and blow coolant everywhere. If you drive your car while this is happening, you will overheat it and warp the head. If you car overheats, DON'T DRIVE IT. PERIOD!!

#9 in this picture: http://www.realoem.com/bmw/showparts...61&hg=11&fg=15

#1 in this picture: http://www.realoem.com/bmw/showparts...58&hg=11&fg=10
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Old 05-16-2007, 07:49 PM   #2
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I'm bored.. Parts are highlighted in Red
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Old 08-22-2007, 04:53 PM   #3
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Just to add: the M42 engine only needs the part labeled as #1. The part labeled as #9 is not on the M42 as the hose goes directly into the head.
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Old 08-24-2007, 01:26 AM   #4
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Here's pictures of the connector for the back of the head:


--



And the side of the block:


--
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Old 11-06-2007, 07:03 AM   #5
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I've had to replace both of those on my 96'. Number 1 just popped lately, and overheated.

Had to have the warped head machined and the valves reseated.
Part: 10$
Head job: 2,500$
Lesson: Priceless. :]
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Old 11-15-2007, 11:02 PM   #6
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Are there metal replacements for these?
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Old 11-15-2007, 11:14 PM   #7
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Nope. And I've still not found anybody with an M42 that had the longer pipe break. The really common failure is the Y shaped pipe on the M44. It breaks at the Y. Doesn't seem like the other one is as flimsy.. Needless to say, I still keep one in my box of spares..

But if you have an M44 you should replace both if you are going to do it.
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Old 11-16-2007, 09:39 PM   #8
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Quote:
Originally Posted by mohaughn View Post
Nope. And I've still not found anybody with an M42 that had the longer pipe break. The really common failure is the Y shaped pipe on the M44. It breaks at the Y. Doesn't seem like the other one is as flimsy.. Needless to say, I still keep one in my box of spares..

But if you have an M44 you should replace both if you are going to do it.
Mohaughn, I just recently had the longer one break. The nipple sticking straight up completely broke off at the bottom ridge. As well as the Y shaped one broke off in the same manor nearly a year ago.

The upper intake manifold had to be removed to get to the the long one.

The Y shaped piece can be got to from the bottom of the car, but its pretty much working blind as theres not much room back there to see what your hand is doing.
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Old 09-17-2008, 01:26 AM   #9
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this is great!!!

how do we go about replacing these? i know where to buy them, but what do we needa remove to get to these parts? is it easy? or am i removing alot of parts?

i was considering flushing my coolant soon, so i might as well do it then.
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Old 09-17-2008, 03:20 AM   #10
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Well, I'm pretty sure that the longer of the two plastic pieces is the easier to put in. It sit on the driver side of the motor and I believe can be replaced if you remove the intake manifold....I did mine when I installed my super so I'm not 100% sure on this. The second smaller piece would be a ROYAL pain in the a** to replace because it sits on the back of the engine between the firewall. So if you dont have midjet hands I'm not sure how you could possibly replace it without some serious tear down.

I will be getting my head gasket seal replaced and I will be getting this smaller piece replaced aswell. Once it gets installed I'll ask my mechanic how you could do it yourself. I'm guessing that you would need to remove the top head of your engine just to fit any tools into the small space to remove and tighten the bolts. I'll let ya know in a few weeks once it gets done.
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Old 09-17-2008, 03:55 AM   #11
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yeah it would be great to know how to do yourself. that parts are like $30, but labor would be alot if u didnt do it yourself.. im getting alot done to my car right now, so might as well put that on the list if its easy to do. i work at sears, so my friends at the autocenter will lift it up when they arent busy, and they work on it under the table for $30 an hour (im giving them 3 times as much as there hourly wage, but its still cheaper then $100 an hour at the 2 places in this area that will even touch my car)
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Old 12-23-2008, 11:06 PM   #12
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He is 100% right about replacing that thing from experience mine cracked then some valve problem in the I-10 freeway while in traffic 2 years ago. I had to replace the whole radiator cause of this small problem.
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Old 12-27-2008, 02:42 PM   #13
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I have a E46 Australian model ,318ti 2003 2Lt engine ,67,000kms.
Is this applicable ?
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Old 12-31-2008, 12:08 AM   #14
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if i have a 98 ti wat model motor do i have?
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Old 12-31-2008, 01:09 AM   #15
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Noga, you should have the m44.
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