Arrangement of the piston rings

CAUTION: Component with heavy weight.
Injury hazard!

Note component's center of gravity.
Support component using a jack.
Secure component against falling off the jack.

Preliminary work

Refer to DISCONNECT THE WIRING HARNESS FROM THE TRANSMISSION .
Refer to RELEASE CONVERTER BOLTING .
Refer to DISCONNECTING TRANSMISSION FROM ENGINE .
Refer to RELEASE THE ENGINE MOUNT .
Refer to LOOSEN THE SCREW CONNECTION ON THE LEFT OF THE ENGINE MOUNT .
Refer to LIFT OUT THE ENGINE WITH THE WORKSHOP CRANE .
Refer to INSTALLING THE ENGINE ON THE ASSEMBLY JIG .
Refer to ENGINE ON ASSEMBLY JIG .
Refer to ATTACHING THE ENGINE WITH THE SPECIAL TOOL
Refer to REMOVE ENGINE VENTILATION LINE .
Refer to REMOVING THE LAMBDA OXYGEN SENSOR AND THE MONITORING OXYGEN SENSOR FOR CYLINDERS 1 TO 4 .
Refer to REMOVE THE LAMBDA OXYGEN SENSOR AND THE MONITORING OXYGEN SENSOR FOR CYLINDERS 5 TO 8 .
Refer to REMOVE UPPER HEAT SHIELD
Refer to REMOVE RIGHT HEAT SHIELD .
Refer to REMOVING THE LEFT HEAT SHIELD .
Refer to RELEASE SCREW BETWEEN THE LEFT AND RIGHT HEAT SHIELD .
Refer to REMOVE RIGHT HEAT SHIELD .
Refer to RELEASE SCREW BETWEEN THE LEFT AND RIGHT HEAT SHIELD .
Refer to REMOVE RIGHT CHARGE AIR COOLER .
Refer to REMOVE LEFT CHARGE AIR COOLER .
Refer to PARTLY LOOSENING THE WIRING HARNESS FROM THE CYLINDER HEAD COVER ON THE LEFT
Refer to PARTIALLY UNDOING WIRING HARNESS FROM RIGHT CYLINDER HEAD COVER .
Refer to REMOVING ALL IGNITION COILS ON THE RIGHT .
Refer to REMOVE ALL LEFT IGNITION COILS .
Refer to REMOVE THE HIGH-PRESSURE RAIL ON THE LEFT .
Refer to REMOVE RIGHT RAIL .
Refer to REMOVE INJECTORS .
Refer to RELEASE THE COOLANT EXPANSION TANK FROM THE HOLDERS .
Refer to BLOCK THE BELT TENSIONER WITH THE SPECIAL TOOL .
Refer to REMOVING DRIVE BELT .
Refer to REMOVE THE TENSIONING PULLEY .
Refer to REMOVING THE ALTERNATOR .
Refer to REMOVE THE HEAT SHIELD OF THE HIGH-PRESSURE PUMP OF THE CYLINDER HEAD COVER ON THE RIGHT, CYLINDERS 1 TO 4 .
Refer to REMOVING THE HEAT SHIELD OF THE HIGH-PRESSURE PUMP CYLINDER HEAD COVER ON THE LEFT, CYLINDERS 5 TO 8 .
Refer to REMOVING FUEL DELIVERY LINE .
Refer to REMOVE THE HIGH-PRESSURE RAIL ON THE LEFT .
Refer to REMOVE RIGHT RAIL .
Refer to REMOVE INJECTORS .
Refer to REMOVE LEFT HIGH PRESSURE PUMP .
Refer to REMOVE RIGHT HIGH-PRESSURE PUMP .
Refer to REMOVE HEAT SHIELD ON THE CYLINDER HEAD COVER ON LEFT AT CYLINDERS 5 TO 8 .
Refer to REMOVE THE HEAT SHIELD ON THE CYLINDER HEAD COVER ON THE RIGHT AT CYLINDERS 1 TO 4 .
Refer to RELEASING PLUG CONNECTION ON VANOS CENTRAL VALVE INTAKE SIDE CYLINDERS 1 TO 4 .
Refer to REMOVING THE VANOS CENTRAL VALVE .
Refer to SCREW CONNECTION OF CYLINDER HEAD COVER, LEFT CYLINDERS 5 TO 8 .
Refer to LEFT CYLINDER HEAD COVER SCREW CONNECTION, CYLINDER 1-4 .
Refer to REMOVE THE OIL RETURN LINE FROM THE OIL RETURN COVER OF CYLINDERS 1 TO 4 .
Refer to RELEASING THE OIL FEED LINE FROM THE EXHAUST TURBOCHARGER OF THE CYLINDERS 1 TO 4 .
Refer to LOOSEN OIL FEED LINE ON EXHAUST TURBOCHARGER OF CYLINDERS 1 TO 4 .
Refer to RELEASE THE BANJO BOLT FOR THE COOLANT LINE FEED LINE AT THE EXHAUST TURBOCHARGER OF CYLINDERS 1 TO 4 .
Refer to LOOSEN THE BANJO BOLT FOR THE COOLANT RETURN LINE AT THE EXHAUST TURBOCHARGER FOR CYLINDERS 1 TO 4 .
Refer to REMOVE THE EXHAUST TURBOCHARGER FOR THE CYLINDERS 1 TO 4 .
Refer to DETACH OIL RETURN LINE FROM THE OIL RETURN COVER OF CYLINDERS 5 TO 8 .
Refer to RELEASING THE OIL FEED LINE FROM THE EXHAUST TURBOCHARGER OF CYLINDERS 5 TO 8 .
Refer to REMOVE EXHAUST TURBOCHARGER FOR CYLINDERS 5 TO 8 .
Refer to REMOVING THE HEAT SHIELD AT THE CYLINDERS 1 TO 4 .
Refer to REMOVING THE HEAT SHIELD AT CYLINDERS 5 TO 8 .
Refer to LOOSENING THE TOP LEFT TIMING CASE COVER .
Refer to LOOSENING THE TOP RIGHT TIMING CASE COVER .
Refer to MOUNTING THE SPECIAL TOOL ON THE PROCESSED SURFACE OF THE CAMSHAFT .
Refer to MOUNTING THE SPECIAL TOOL ON THE INTAKE CAMSHAFT FOR CYLINDERS 1 THROUGH 4 .
Refer to MOUNTING THE SPECIAL TOOL ON THE EXHAUST CAMSHAFT FOR CYLINDERS 1 THROUGH 4 .
Refer to MOUNTING THE SPECIAL TOOL ON THE INTAKE CAMSHAFT FOR CYLINDERS 5 THROUGH 8 .
Refer to MOUNTING THE SPECIAL TOOL ON THE EXHAUST CAMSHAFT FOR CYLINDERS 5 THROUGH 8 .
Refer to RELEASE THE SLIDE RAIL OF THE UPPER CAMSHAFT CYLINDERS 1 TO 4 .
Refer to RELEASING THE SLIDE RAIL OF THE UPPER CAMSHAFT CYLINDERS 5 TO 8 .
Refer to REMOVING THE VANOS CENTRAL VALVES 5 TO 8 INTAKE .
Refer to REMOVING THE VANOS CENTRAL VALVE 5 TO 8 FOR THE EXHAUST .
Refer to REMOVING THE VANOS CENTRAL VALVES 1 TO 4, INTAKE .
Refer to REMOVING THE VANOS CENTRAL VALVES 1 TO 4 EXHAUST .
Refer to CHECK THE VANOS CENTRAL VALVE .
Refer to DETACH THE COOLANT HOSES ON CYLINDER HEAD 1 TO 4 AND 5 TO 8 .
Refer to RELEASE THE CYLINDER HEAD BOLTS OF THE CYLINDERS 5 TO 8 AT THE TIMING CASE COVER .
Refer to UNSCREW CYLINDER HEAD BOLTS FOR CYLINDERS 5 TO 8 .
Refer to LIFT CYLINDER HEAD 5 TO 8 WITH LIFTING DEVICE .
Refer to REMOVING CYLINDER HEAD 5 TO 8 USING LIFTING GEAR .
Refer to DISCONNECT THE PLUG CONNECTION AT CYLINDER HEAD 5-8 .
Refer to RELEASE THE GUIDE RAIL OF THE CYLINDERS 1 TO 4 .
Refer to RELEASE THE CYLINDER HEAD BOLT AT THE TIMING CASE COVER .
Refer to REMOVING THE CONNECTING BRACKET TOWARDS THE RADIATOR .
Refer to RELEASE THE COOLANT PIPE AT THE CYLINDER HEADS 5 TO 8 .
Refer to TWIST THE INTAKE CAMSHAFT BY 180° .
Refer to REMOVE CYLINDER HEAD CYLINDER 1 TO 4 .
Refer to INSTALLING THE SPECIAL TOOL FOR CYLINDER HEAD 1-4 .
Refer to INSTALLING THE SPECIAL TOOL FOR CYLINDER HEAD 1-4 .
Refer to RAISE CYLINDER HEAD 1 TO 4 WITH LIFTING GEAR .
Refer to RELEASING THE OIL DRAIN PLUG .
Refer to RELEASE THE CONNECTOR OF THE OIL PAN'S OIL LEVEL SENSOR .
Refer to RELEASE THE OIL PAN SCREW CONNECTION OF THE LOWER OIL PAN .
Refer to REMOVE AIR CONDITIONING COMPRESSOR .
Refer to DISCONNECT THE COOLANT PUMP COOLANT HOSE .
Unlock and disconnect the coolant hose (1). Unlock and disconnect the plug connection (2) on the thermostat.

Courtesy of BMW OF NORTH AMERICA, INC.
Refer to DISCONNECT THE COOLANT PUMP PLUG CONNECTION .
Refer to RELEASE THE SCREWS ON THE OIL PUMP DRIVE WHEEL .
Refer to REMOVING THE OIL INTAKE SNORKEL .
Refer to RELEASE THE SCREW CONNECTION OF THE OIL TUBE .
Refer to REMOVING THE OIL LINE FROM THE CRANKCASE .
Refer to LOOSENING AND SECURING THE OIL PUMP .
Refer to REMOVE OIL PUMP .
Refer to REMOVING THE OIL LINE (DOUBLE PIPE) FROM THE CRANKCASE .
Refer to UNSCREW SCREW CONNECTION OF THE UPPER OIL SUMP SECTION (ALL-WHEEL DRIVE) .
Refer to REMOVING THE CONNECTING ROD BOLTS AND CONNECTING ROD BEARING CAPS .
Refer to REMOVING THE PISTONS AT THE CYLINDERS 1 TO 4 WITH THE SPECIAL TOOL .
Refer to REMOVING THE PISTON AT CYLINDERS 5 TO 8 USING SPECIAL TOOL .
Refer to REMOVING THE PISTON PIN CIRCLIP .

Arrangement of piston rings.
Piston ring (1) Compression ring. (l) Compression ring.

Piston ring (2) taper faced piston ring

Piston ring (3) oil scraper ring with spiral expander.

Courtesy of BMW OF NORTH AMERICA, INC.