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Old Thu, Jul-24-2008, 08:49:13 PM   #1
ccM3zcp
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Default E46 M3 Engine Block Failure

I've got an '05 M3 with 21k miles, otherwise in mint condition except for the inspection 1 service tech found a severe coolant leak out of the side of the engine block (left side), not leaking from a gasket or hose. They called it a porous hole. Of the three master techs at my svc center, none have ever seen a bmw with this problem. Here's the kicker: The BMW field tech said they have seen this problem once or twice and they fixed it by adding something to the coolant that flushes through and fills in the porous holes to clog the leak. The svc manager at the dealership didn't even want to call me to tell me this was what BMW was reccomending as a fix. If I make enough noise I can probably get a new engine out of it under warranty for a faulty casting. My question is has anybody out there seen this or heard of this happening? and what was the resolution in your situations?
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Old Thu, Jul-24-2008, 09:48:57 PM   #2
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if u let them just seal the hole, push for a longer engine warranty for free
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Old Fri, Aug-08-2008, 04:04:22 PM   #3
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If you can get them using the description, "porous hole in the engine block", in the service write up, you have a strong legal case for a brand new engine. This terminology to me indicates a faulty engine block from the factory.
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Old Fri, Aug-08-2008, 04:26:26 PM   #4
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get them to replace your engine because you don't want your car to
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Old Fri, Aug-08-2008, 06:30:11 PM   #5
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"The BMW field tech said they have seen this problem once or twice and they fixed it by adding something to the coolant that flushes through and fills in the porous holes to clog the leak."

are you serious??????
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Old Fri, Aug-08-2008, 07:03:51 PM   #6
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Sounds like a bad engine casting plain and simple. I'm surprised they didn't recomend a bottle of BARS LEAK from the sound of them! Morons! I'd either A. push for a new engine or B tell them you want it sealed and an extended warrenty with this SERIOUS issue noted free of charge.

PS by sealed tell them to use a product such as MARINETEX a seriously strong 2 part epoxy that I've used to fix cracked engine blocks of 18 wheelers before. And yes the stuff holds!
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Old Fri, Aug-08-2008, 07:05:15 PM   #7
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replace the engine wtf
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Old Wed, Aug-13-2008, 06:55:25 PM   #8
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WTF engine block failure on an 05 with JUST 21k miles?? get them to a) give you extended warranty or b) replace engine...

if they don't do either, call BMWNA...
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Old Thu, Aug-14-2008, 07:09:13 AM   #9
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I guess I owe you all an update... BMW is covering the repair, giving me a new (remanufactured) short block and rebuilding the engine that way. Nobody at BMW NA customer service has ever heard of an M3 like mine with a cracked block...so the good news for you all is that your cars should all be fine in this respect. I just happened to draw the 1 in 500,000 cracked block.
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Old Mon, May-10-2010, 01:30:17 AM   #10
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I guess I got the second failed block. Mine is leaking coolant as well.
My car is also a 2005 M3 ZCP (ZCP probably doesn't matter), 40,000 miles. Production date: 12/1/2004.
Maybe it was a bad day?? Certainly looks like a manufacturing defect.

Right now BMW is deciding to cover it or not. Car is out of warranty.
Who could have thought that the "bulletproof" cast iron block could be leaking.
Not sure if it's a crack or a porosity issue.

Car was a Performance Center car. So, it was driven hard early on, and this may have contributed to the issue.
I don't know if it has anything to do with it, but the M badge on the engine was warped when I bought the car.
Maybe a sign of overheating in Spartanburg. Engine never burned a drop of oil and ran like a champ... still does except for the leak (doesn't overheat however).

Leak is visible under the intake area.

Did this happen to anyone else? What's the production date?

Thanks.

Last edited by keca10; Mon, May-10-2010 at 01:35:09 AM.
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Discussing E46 M3 Engine Block Failure in the General BMW Discussion Forum - Place to discuss all things BMW. And a place for E30, E36, and E46 owners to get to know each other! BMW News at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)