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#1
11-02-2009, 03:54 PM
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Exhaust Gases in Coolant
I'm wondering if there is any way to narrow the problem down between the gasket/head/block without doing a teardown? I don't have the typical signs of a head gasket (oil in the coolant, water in the oil or white smoke on startup) - just an ongoing problem with air in the cooling system and over-pressurization. I'm wondering if I should just assume its a cracked head or is it more likely to be a gasket or the block? The engine was mildly overheated when a hose popped of but afterwards runs absolutely fine except for the cooling system problem - it doesn't use coolant or oil and doesn't appear to contaiminate the oil with coolant.  Advice appreciated.. Also my local shop claims that the engine has to come out for a head gasket replacement, but can anyone confirm?? 
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#2
11-02-2009, 08:45 PM
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had this problem on a 318i , it was caused by a small O-ring seal on the intake manifold .
problem was diagnosed by an independent motor engineer because bmw technicians generally can`t find such problems . i do not know if 3.0i manifold has coolant chambers but if it does then this could be the problem .
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#3
11-02-2009, 09:05 PM
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The 3.0i engine has a bad habit when overheated of pulling threads on head bolts in the middle cylinders of the block... Caused by the expansion rate of the aluminum head vs the steel bolts. I wouldn't count out a head gasket as I've seen the gaskets blow in many ways, they don't always blow the same. A leakdown test would tell you which cylinder's exhaust gasses are getting in there, then just pull the valve cover and try re-torquing the head bolts around that cylinder. If they tighten properly the threads are fine, if they keep turning and don't reach proper torque the threads are pulled. In this case I've seen people including my shop foreman have good results with helicoiling the block.
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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is 
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#4
11-03-2009, 01:42 PM
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Quote:
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#5
11-03-2009, 01:45 PM
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Quote:
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#6
11-03-2009, 02:44 PM
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That is right at the labor charge of the dealer for R&I cylinder head, but it doesn't need engine removal... Just remove the intake and exhaust manifolds, the vanos and camshafts, then the head.
__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is
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#7
11-03-2009, 08:51 PM
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the 318i was sold 2 years ago to a very happy family .
bmw dealer tried 2 or 3 times to find leak but failed . a local engineer tested coolant for gasses and found very small amounts which suggested the manifold seal so he replaced the seal and the car never used any more coolant thereafter . i do not know exact location of the seal but if your car has one then it will be obvious when the manifold is removed .
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