Repairing Threads on Magnesium Engine Block

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.
Aluminium screws/bolts are permitted with and without
color coding (blue).
For reliable identification:
Aluminium screws/bolts are not magnetic.
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 Note:
Ensure exact angularity to workpiece.

Blow out core bore cleanly.
No chips are permitted in the drilled hole.





Screw in Helicoil drill bit (2) with die (1).

Installation Note:
Ensure exact angularity to workpiece.





Important!
Do not allow chips (1) to come into contact with water.
Danger of fire and explosion.





Screw in aluminium Helicoil (1) by hand in direction of arrow as far as it will go.
Adjust spacer (2) approx. 1 mm.
Secure spacer (2) with lock nut (3).





Screw in Helicoil-Plus (1) with preassembled aluminium Helicoil.





Screw aluminium Helicoil into workpiece (1) as far as it will go.
Remove Helicoil-Plus (2) again after screwing in.

Installation Note:
Aluminium Helicoil remains in workpiece (1).





Break mounting hook off with mounting mandrel (1).

Note:
Blow mounting hook out of pocket hole with compressed air.





Assemble engine.