Install the piston rings
NOTE:
RISK OF DAMAGE
Very wide spreading of the piston rings during installation/removal.
Damage to the piston rings.
Very wide spreading of the piston rings during installation/removal.
Damage to the piston rings.
- Spread the piston rings only until the piston ring can just be slid over the piston.
- Use piston ring pliers to install and remove the piston rings.
NOTE:
TECHNICAL INFORMATION
Clean the used pistons carefully . Do not use a metal-cutting tool to avoid damaging the pistons.
Clean the used pistons carefully . Do not use a metal-cutting tool to avoid damaging the pistons.
NOTE:
TECHNICAL INFORMATION
Wear safety goggles.
Wear safety goggles.
NOTE:
The description is for one component only. The procedure is identical for all further components.
- Determining the correct set of the piston ring (1) (see applicable BMW parts catalogue):
| Engine | Set of piston rings | Pistons |
|---|---|---|
| B38M1 ECE | 8 693 017 | 8 678 931 |
| B38M1 ECE | 8 693 017 | 9 494 399 |
| B48M1 ECE | 8 693 017 | 8 678 931 |
| B48M1 ECE | 8 693 017 | 9 494 399 |
| B38M1 CN | 8 693 017 | 8 678 931 |
| B38M1 CN | 9 847 276 | 8 681 079 |
| B48M1 CN | 8 693 017 | 8 678 931 |
| B48M1 CN | 9 847 276 | 8 681 079 |
| B48O1 ECE+CN | 8 693 017 | 8 678 934 |
| B48T1 ECE+CN | 9 846 014 | 9 488 343 |
| B58M1 | 9 847 276 | 8 681 079 |
| B58O1 | 9 693 017 | 8 678 934 |
- Keep the standard piston ring pliers (1) ready.
- Correctly prepare the piston rings:
Upper piston ring (1): Plain rectangular compression ring (engraving must point upwards)
Center piston ring (2): Taper faced piston ring (engraving must point upwards)
Oil scraper ring (3): consists of 2 piston rings ((O1), (O3)) with a spring (O2) in the center.
- Make sure that the assembly mark TOP (1) points to the top to the combustion chamber.
- If there is no assembly mark TOP (1), then the piston ring with the writing must point to the top to the combustion chamber.
- Attach the oil scraper rings (1) and springs (2) manually (see following steps).
- Slide the spring (1) on to the piston (2) and install it.
- Slide the two oil scraper rings (1) on to the piston (2) and install them.
- Position the center piston ring (1) in the marked area
at the piston ring pliers (2).
- Clamp the piston ring pliers (1) in arrow direction and feed in the center piston ring (2) in the piston (3) and install it.
- Release the piston ring pliers (1) at the center piston ring (2).
- Feed out the piston ring pliers (1) at the center piston ring (2) and remove it.
- Position the upper piston ring (1) in the marked area
at the piston ring pliers (2).
- Clamp the piston ring pliers (1) in arrow direction and feed in the upper piston ring (2) in the piston (3) and install it.
- Release the piston ring pliers (1) at the upper piston ring (2).
- Feed out the piston ring pliers (1) at the upper piston ring (2) and remove it.
Follow-up work
- Refer to INSTALLING ALL PISTONS WITH CONNECTING ROD .
- Refer to INSTALLING THE OIL DEFLECTOR
- Refer to INSTALL THE OIL VACUUM PUMP .
- Refer to REFITTING ENGINE OIL PAN .
- Refer to INSTALLING STARTER MOTOR
- Refer to INSTALL THE ACOUSTIC COVER FOR THE OIL SUMP .
- Refer to SEAL THE OIL DUCT .
- Refer to CLEAN SEALING SURFACES .
- Refer to INSTALLING THE CYLINDER HEAD GASKET .
- Refer to BLOCKING THE CRANKSHAFT IN THE TDC FIRING POSITION OF CYLINDER 1 .
- Refer to INSTALLING THE CYLINDER HEAD .
- Refer to ADJUSTING THE CAMSHAFTS WITH THE SPECIAL TOOL .
- Refer to INSTALLING THE INTAKE ADJUSTER .
- Refer to INSTALLING THE VANOS CENTRAL VALVE OF THE INTAKE ADJUSTER .
- Refer to INSTALL EXHAUST CAMSHAFT ADJUSTER .
- Refer to INSTALLING THE VANOS CENTRAL VALVE OF THE EXHAUST CAMSHAFT ADJUSTER .
- Refer to PRE-TENSIONING THE TIMING CHAIN WITH THE SPECIAL TOOL .
- Refer to TIGHTENING THE VANOS CENTRAL VALVE OF THE EXHAUST CAMSHAFT ADJUSTER .
- Refer to TIGHTENING THE VANOS CENTRAL VALVE OF THE INTAKE ADJUSTER .
- Refer to DISASSEMBLING ALL SPECIAL TOOLS
- Refer to INSTALL CHAIN TENSIONER .
- Refer to CHECKING THE TIMINGS OF THE CAMSHAFT .
- Refer to INSTALLING THE COOLANT LINE BETWEEN THE CYLINDER HEAD AND THE COOLANT PUMP .
- Refer to INSTALLING THE OIL RETURN LINE FOR THE EXHAUST TURBOCHARGER .
- Refer to INSTALLING CYLINDER HEAD COVER .
- Refer to INSTALLING BOTH ACTUATORS .
- Refer to PREPARE THE INJECTORS FOR INSTALLATION .
- Refer to INSTALLING THE HIGH-PRESSURE RAIL WITH INJECTORS OF THE CYLINDERS 4 TO 6 .
- Refer to INSTALLING RAIL WITH INJECTORS OF CYLINDERS 1 TO 3 .
- Refer to INSTALLING THE HIGH-PRESSURE LINE BETWEEN THE HIGH-PRESSURE PUMP AND THE HIGH-PRESSURE RAIL .
- Refer to INSTALLING HIGH PRESSURE PUMP .
- Refer to INSTALLING FUEL DELIVERY LINE .
- Refer to REPLACE SPARK PLUGS (540i 2017-2020) , or REMOVING ALL SPARK PLUGS (540i 2021-2022) .
- Refer to INSTALL ALL IGNITION COILS .
- Refer to INSTALL CATALYTIC CONVERTER .
- Refer to INSTALLING THE OXYGEN SENSOR MONITOR .
- Refer to INSTALLING LAMBDA OXYGEN SENSOR .
- Refer to INSTALLING THE INTAKE PLENUM .
- Refer to INSTALLING THE TANK VENT VALVE .
- Refer to INSTALLING ACOUSTIC COVER AT REAR .
- Refer to FILLING ENGINE OIL .
- Refer to OPENING THE OIL FILLER CAP .
- Refer to REMOVING THE ENGINE FROM THE ASSEMBLY JIG .
- Refer to MOUNTING THE ENGINE ON THE FRONT AXLE .
- Refer to INSTALLING THE COMPLETE FRONT AXLE INCLUDING ENGINE AND TRANSMISSION .