5 Series E61 523i (N52) TOUR
11 00 610
Repairing threads on magnesium engine
block
Important!
Any work on the magnesium that creates dust must not be
carried out without suitable dust extraction apparatus in place.
Magnesium and water can react by forming magnesium
hydroxide and hydrogen.
Do not use any emulsions containing water to lubricate the
magnesium material.
Only engine oil may be used for lubrication.
Important!
Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of
electrochemical corrosion.
A magnesium crankcase requires aluminium screws/bolts
exclusively.
Aluminium screws/bolts must be replaced each time they are
released.
The end faces of aluminium screws/bolts are painted blue for
the purposes of reliable identification.
Jointing torque and angle of rotation must be observed
without fail (risk of damage).
Tape off parts to be cleaned (3) cleanly and protect against
chips.
Use core drill bit (2) with hand drill (1).
Installation:
Ensure exact angularity to workpiece.
Blow out core bore cleanly.
No chips are permitted in the drilled hole.
RA Repairing threads on magnesium engine block
BMW AG - TIS
05.02.2013 01:20
Issue status (12/2007) Valid only until next DVD is issued
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