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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 08-07-2015, 04:06 PM   #1
swiftwill
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e46 n42 b20 engine lack of power !!

hi guys first post so be gentle . my timing chain jumped and it knocked out all the timking luckily it never damaged any valves. but the engine did overheat, I got a new timing chain fitted, a full service done. turned her over and everything seemed fine. the engine reached normal temp, then the red oil warning light starts to flash, then after about 30 seconds stayed on. I turned engine off looked at oil cap and milky coloured. my question is , cylinder head???? I was thinking of a replacement engine, but should I get the head skimmed, as a first option?

any ideas would be fantastic.

thanks
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Old 08-07-2015, 04:51 PM   #2
BaliDawg
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Head Gasket Failure symptoms and tests

Cooling system pressure test
Cylinder leakdown test
Loss of coolant with no leak
Exhaust gases in coolant sniffer check
Pressurized cooling system after running less than a minute
Sweet antifreeze smell or steam from exhaust
Coolant leaking from the head/block joint
Bubbles in the radiator or expansion tank
Oil in the coolant
Coolant in the oil
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Old 08-07-2015, 05:13 PM   #3
swiftwill
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thanks for the reply. there is coolant in the oil, would skimming the head sort this, the temp gauge dosent go past normal, but wont drive and goes into safe mode?

thanks
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Old 08-07-2015, 05:14 PM   #4
swiftwill
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would a damaged oil pump cause this?

thanks
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Old 08-07-2015, 05:48 PM   #5
BaliDawg
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If you have coolant in the oil it is most likely a blown head gasket, but there may be other places where a coolant passage could leak into the oil and vice versa. This is a serious problem. Do some checks I listed in the last post to narrow down what the problem really is.
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