Thread: 525i Head
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  #19  
Old 01-31-2011, 10:01 AM
injunmort injunmort is offline
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Location: sugarloaf ny
 
Join Date: Aug 2009
Posts: 621
Mein Auto: 1990 525, 1991 535
cracked heads are not that common. when you remove it, take it to a machine shop and have them hot tank it. it will come out nice and clean, inspect it for cracks. the head gasket failing is a common problem on these cars. i would check that head has not warped by using a strait edge and if it is not, adjust the valve lash, replace stock head gasket replace head bolts and torque to spec from bentley. you will need a protractor wrench for the final tocquing. replace your water pump and hoses, change cps and you should be good to go. do the thermostat and housing as well, even if it is aluminum because they corrode and fail. rebuilding the head is a ton of work and you need special tools to remove the cam without breaking it. remanufacured heads are not cheap and not cheap to ship. you can do this for about $300.00 with no machine work or it could cost 1500-2000 if you go with the remaned head. fwiw.
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