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In Reply to: Re: Striped engine block thread after overheating posted by Stepan on April 02, 2000 at 10:00:42:
: : My Bmw E39(528i ,Yr 1996) overheated again after an engine top overhaul was done,on investigating,found that coolant was seeping between block & head.After removing the head,found that thread from most of the holes has been stripped,However,tightning sequence & torque/angle we set to specification on installation of the head. The question on my mind is.....could the first experience of overheating cause the aluminum alloy block to have weaken thus causing the thread to loose it's form & strenght (ie as aluminum has a lower melting poit than cast iron).....Hope you guys out there are able to throw some light on this & tell me the best cost of action..... to rethread the block or change a new blockthat will cost lots of $$$$. Thanks
: Correct me if I am wrong but it is my beleive that I6s have iron block and V8, V12 have aluminum block. If I am wrong and your I6 does have aluminum block the best solution is to rethread it. You should have no problem with it. Most probably you lost threads because you did not put untiseizure lubricant on head bolts last time and took the thread with them out this time.
: I hope it helps.
:
: Stepan
Aluminum block in the e39 six and eight cyl.
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