M62 Dead Engine

[Tatch]

Has anyone come across any terminal overpressure problems with the M62 V8 engine from the e39 540?
I know about the nikasil lining/ high sulpher petrol problem with the m60 engine, but have not read anything about its replacement.
The engine has been stripped down to the cylinder head which has been pressure tested and is fine but when rebuilt the coolant system still pressurises.

[billB]

Originally posted by Tatch@Jan 5 2005, 02:51 PM
Has anyone come across any terminal overpressure problems with the M62 V8 engine from the e39 540?
I know about the nikasil lining/ high sulpher petrol problem with the m60 engine, but have not read anything about its replacement.
The engine has been stripped down to the cylinder head which has been pressure tested and is fine but when rebuilt the coolant system still pressurises.

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I am thinking in terms of the head itself; did you replace/shave the old one or used a rebuilt ? when reinstalled was it torqued properly? Last year I went through a similar ordeal on an inline 6 after a catastrophic overheat which required replacing the whole head; and when a smart mechanic installed it he over torqued it only to give a tiny crack right next to the spark plug hole (last hole by the fire wall). Sure enough she pressurized again thus overheating. In short I had to buy him a second head plus a second head gasket to get it fixed right after a tow. Yes he paid for the antifreeze but destroyed my O2 sensors with it!

My 2 cents!