Removing the screw plug at the cylinder head

DANGER

High-voltage system.

The high-voltage system operates on the basis of hazardous, electrical voltage and high currents. Mortal hazard through electric shock!

All work on the high-voltage system may only be carried out by specially trained and technically experienced personnel.
For additional information see: 61 00... SAFETY INSTRUCTIONS ON HANDLING HYBRID CARS .
For additional information see: 61 25... NOTES ON REPAIR OF HIGH-VOLTAGE BATTERY UNIT .

WARNING: Hot surfaces.
Risk of burning!

Perform all work only on components that have cooled down.

NOTE: TECHNICAL INFORMATION
A hardening time of 24 h must be observed after wetting the screw with the screw locking agent.
During the hardening time, the engine must not be started.
Filling the coolant circuit is only permitted after the hardening time.

NOTE: TECHNICAL INFORMATION
The repair solution differs depending on the installed screw plug (different thread pitches).

NOTE: TECHNICAL INFORMATION
Collect and dispose of emerging fluids. Observe country-specific waste disposal regulations.

Preliminary work

Refer to BRINGING FRONT COMPARTMENT LID IN THE SERVICE POSITION .
Refer to REMOVING FLAP IN LUGGAGE COMPARTMENT TRIM PANEL ON RIGHT .
Refer to DE-ENERGIZING THE HIGH-VOLTAGE SYSTEM .
Refer to CHECKING THAT NO VOLTAGE IS APPLIED .
Refer to REMOVING THE ACOUSTIC COVER .
Refer to REMOVING THE COVER FOR THE CENTER ENGINE COMPARTMENT .
Refer to REMOVING BOTH FRONT-END STRUTS .
Refer to REMOVING FRONT CROSS CONNECTION (FRONT-END STRUT REMOVED) .
Refer to REMOVING THE REAR TOP CROSS CONNECTION .
Refer to REMOVING FAN COWL .
Refer to REMOVING THE INTAKE FILTER HOUSING (TENSION STRUT ON SHOCK TOWER REMOVED) .
Refer to REMOVING THE RESONATOR WITH THE TOP CLEAN AIR PIPE .
Refer to REMOVING BOTTOM CLEAN AIR PIPE .
Refer to REMOVING CHARGE AIR LINE .
Refer to REMOVING THE DRIVE BELT FOR COOLANT PUMP .
Refer to REMOVING THE LAMBDA OXYGEN SENSOR .
Refer to REMOVING THE OXYGEN SENSOR MONITOR .
Refer to REMOVING THE FRONT UNDERBODY PROTECTION OR FRONT THRUST FIELD .
Refer to REMOVING THE UNDERBODY PROTECTION OF THE STEERING GEAR AND THRUST FIELD RESPECTIVELY .
Refer to REMOVING THE FRONT THRUST FIELD .
Refer to REMOVING THE STIFFENING PLATE .
Refer to REMOVING REAR UNDERBODY PROTECTION .
Refer to REMOVING THE COVER OF THE STEERING ASSEMBLY .
Refer to DRAINING THE COOLANT FROM THE HIGH-TEMPERATURE COOLING SYSTEM .
Refer to CONNECTING THE COOLANT LINE OF HIGH-TEMPERATURE COOLANT CIRCUIT .
Refer to REMOVING THE COOLANT LINE BETWEEN THE COOLANT PUMP AND CYLINDER HEAD .
Refer to REMOVING THE CONNECTING SUPPORT FROM THE TUNNEL .
Refer to IF INSTALLED: REMOVING THE TORSION STRUT ON THE RIGHT AND LEFT WHERE REQUIRED .
Refer to REMOVING THE REAR AXLE COVER .
Refer to REMOVING THE REAR DIFFUSER .
Refer to REMOVING COMPLETE EXHAUST SYSTEM .
Refer to REMOVING CATALYTIC CONVERTER .
Refer to REMOVING THE OIL RETURN LINE FOR THE TURBOCHARGER .
Refer to REMOVING TURBOCHARGER .

Screw plug on cylinder head

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: TECHNICAL INFORMATION
The repair solution differs depending on the installed screw plug (different thread pitches).

Prepare the commercially available thread arrows (1) .

Courtesy of BMW OF NORTH AMERICA, INC.

Check
Check the thread pitch (B) with the thread arrows.

Courtesy of BMW OF NORTH AMERICA, INC.

Result

» Thread pitch = 1.0

Measure

Replace cylinder head.

Check

Check the thread pitch (A) with the thread arrows.

Courtesy of BMW OF NORTH AMERICA, INC.

Result

» Thread pitch = 1.5

Measure

Carry out the next step.

Release the screw plugs (1) .
Guide out and remove the screw plugs (1) .

Courtesy of BMW OF NORTH AMERICA, INC.