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Check Flatness (archive)
[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]
Posted by JakeS on December 18, 2000 at 07:50:21:

In Reply to: Common causes are: use of incorrect antifreeze, posted by Bill R. on December 17, 2000 at 19:28:51:

If blown gasket is due to overheating then the head will be warped. Warping in what lets the gasket get loose, which causes the blowout. If it has warped, you will need it milled flat at a minimum.

My guess is that wrong antifreeze causes passage blockage and then overheating. Else it is etching of surfaces and thus channel formation. Either way, milling is again the only solution.

Of course I have also seen overtorquing of head bolts result in crushing and displacement of seal ring of head gasket. If this is the case, then you can usually get away with just replacing the gasket.

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