Installing piston with connecting rod

Aligning piston rings 

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• Align the contact points of all piston rings rotated by 120° each.

  Do not position contact points over axis of piston pin (A)  .

  Piston ring	Alignment
  Lower oil scraper ring (O3)	12 o'clock position (1)
  Spring (O2)	4 o'clock position (2)
  Upper oil scraper ring (O1)	8 o'clock position (3)
  Central piston ring (K2)	12 o'clock position (1)
  Upper piston ring (K1)	4 o'clock position (2)

• Make sure that the contact point on the oil scraper ring does not overlap.

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• For N63M3 installation is only permitted in the following combinations of connecting rod bearing shells (1)  .
  • Vehicles up to 03/31/2019 yellow - blue 
  • Vehicles up to 03/31/2019 green - red 
  • Vehicles up to 04/01/2019 green - red 
  • Vehicles up to 04/01/2019 blue - yellow 

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• For N63T3 installation is only permitted in the following combinations of connecting rod bearing shells (1)  .
  • Red - Blue 
  • Green - Yellow 
• For S63T4 installation is only permitted in the following combinations of connecting rod bearing shells (1)  .
  • Green - Brown 
• Insert the connecting rod bearing shell (1)  into the connecting rod bearing cap and secure it with the retaining lugs (see arrows).

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• Insert the Irox coated connecting rod bearings (1)  into the connecting rod bearing cap and secure it with the retaining lugs (see arrows).

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• Do not clean the crack surfaces (1)  with compressed air.
• Vacuum off any new connecting rods off prior to the installation. With a commercial vacuum (2)  .

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• Screw special tools 2 249 164  into the threading in area (1)  of the connecting rod.

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• Connecting rods and connecting rod bearing caps are denoted with the same pairing letters (1)  , do not mix them up.

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• Position the piston (1)  and connecting rod at the crankcase.

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• The arrows (1)  on the piston and connecting rod bearing cap must point in the driving direction to the timing chain (2)  .

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• Compress special tool 0 494 310 (11 7 280) (2)  until the piston (1)  can be installed into the crankcase.

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  Piston rings must not get caught  .

  Rotate crankshaft at central bolt if necessary  .

• Remove special tools 2 249 164  .

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• Position the crankshaft (2)  .

• Insert connecting rod bearing cap so that the matching letters (3)  are on the same side.
• Tighten connecting rod bolt using special tool  0 490 504 (00 9 120)  .

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Connecting rod bolts, for new connecting rod
M9x1.25 Screw. Suction off crack surfaces.	1. Joining torque	5 Nm
	2. Joining torque	20 Nm
	3. Joining torque	30 Nm
	4. Angle of rotation	75°

Screw connection, for new connecting rod bolts only
M9x1.25 Replace screws. Suction off crack surfaces.	1. Tightening torque	5 Nm
	2. Tightening torque	20 Nm
	3. Tightening torque	30 Nm
	4. Angle of rotation	75°
	5. Unscrew all bolts  .	180°
	6. Tightening torque	5 Nm
	7. Tightening torque	20 Nm
	8. Tightening torque	30 Nm
	9. Angle of rotation	75°
	10. Unscrew all bolts  .	180°
	11. Tightening torque	5 Nm
	12. Tightening torque	20 Nm
	13. Tightening torque	30 Nm
	14. Angle of rotation	75°

Checking the side clearance of the connecting rod bearing 

• Install special tool 0 493 143 (11 6 250)  on the crankcase.
• Press both connecting rods (1)  up to the stop.
• Set dial gauge 0 493 143 (11 6 250)  to 0.
• Press both connecting rods (1)  to the stop and read out the values.

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Follow-up work 

• Refer to INSTALLING THE UPPER OIL SUMP SECTION .
• Refer to INSTALLING FRONT AXLE DIFFERENTIAL .
• Refer to INSTALLING OIL PUMP .
• Refer to INSTALLING THE LOWER OIL PAN SECTION .
• Refer to INSTALLING THE RIGHT CYLINDER HEAD .
• Refer to INSTALLING BOTH RIGHT VANOS ADJUSTERS .
• Refer to REMOVING THE SPECIAL TOOL TO PRETENSION THE TIMING CHAIN AT CYLINDER BANK 1 .
• Refer to INSTALLING THE HYDRAULIC CHAIN TENSIONER OF CYLINDER BANK 1 .
• Refer to INSTALLING THE SEALING CAP ON THE CYLINDER HEAD OF CYLINDER BANK 1 .
• Refer to INSTALLING THE CYLINDER HEAD COVER ON THE RIGHT .
• Refer to INSTALLING VANOS SOLENOID ACTUATOR, EXHAUST OF CYLINDER BANK 1 .
• Refer to INSTALLING THE VANOS SOLENOID ACTUATOR INTAKE OF CYLINDER BANK 1 .
• Refer to INSTALLING THE INJECTORS FOR THE CYLINDERS 1 TO 4 .
• Refer to SECURING THE WIRING HARNESS SECTION OF THE CYLINDER HEAD COVER ON THE RIGHT .
• Refer to INSTALLING RIGHT HIGH PRESSURE PUMP .
• Refer to INSTALLING FUEL DELIVERY LINE .
• Refer to INSTALLING THE RIGHT HIGH-PRESSURE RAIL .
• Refer to INSTALLING THE GUIDE TUBE FOR THE OIL DIPSTICK .
• Refer to INSTALLING THE OIL FILLER CAP .
• Refer to INSTALLING IGNITION COILS OF CYLINDER BANK 1 .
• Refer to INSTALLING THE ENGINE VENTILATION LINE OF CYLINDERS 1 TO 4 .
• Refer to INSTALLING THE LEFT CYLINDER HEAD .
• Refer to INSTALLING BOTH LEFT VANOS ADJUSTERS .
• Refer to REMOVING SPECIAL TOOL TO PRETENSION TIMING CHAIN ON CYLINDER BANK 2 .
• Refer to INSTALLING THE HYDRAULIC CHAIN TENSIONER OF CYLINDER BANK 2 .
• Refer to INSTALLING THE SEALING CAP ON THE CYLINDER HEAD OF CYLINDER BANK 2 .
• Refer to INSTALLING THE LEFT CYLINDER HEAD COVER .
• Refer to INSTALLING THE VANOS SOLENOID ACTUATOR EXHAUST OF CYLINDER BANK 2 .
• Refer to INSTALLING VANOS SOLENOID ACTUATOR, INTAKE OF CYLINDER BANK 2 .
• Refer to INSTALLING FUEL DELIVERY LINE .
• Refer to SECURING THE WIRING HARNESS SECTION FROM THE CYLINDER HEAD COVER ON THE LEFT .
• Refer to INSERTING THE EXHAUST TURBOCHARGER FOR THE CYLINDERS 5 TO 8 .
• Refer to INSTALLING THE ENGINE VENTILATION LINE OF CYLINDERS 5 TO 8 .
• Refer to INSTALLING THE INTAKE PIPE OF THE ENGINE VENTILATION LINE .
• Refer to INSTALLING RIGHT CLEAN AIR PIPE .
• Refer to INSTALLING LEFT CLEAN AIR PIPE .
• Refer to INSTALLING THE LEFT ENGINE VENTILATION LINE (PARTIALLY REMOVED) .
• Refer to INSTALLING THE RIGHT-HAND CHARGE AIR COOLER .
• Refer to INSTALLING THE LEFT-HAND CHARGE AIR COOLER .
• Refer to CONNECTING THE LEFT CHARGE AIR LINE TO THE EXHAUST TURBOCHARGER .
• Refer to CONNECTING THE RIGHT CHARGE AIR LINE TO THE EXHAUST TURBOCHARGER .
• Refer to INSTALLING THE CARRIER PLATE .
• Refer to PREPARING THE INJECTORS FOR INSTALLATION .
• Refer to INSTALLING THE INJECTORS FOR THE CYLINDERS 5 TO 8 .
• Refer to CONNECTING THE CONNECTOR OF THE INJECTORS OF CYLINDER BANK 2 .
• Refer to INSTALLING THE LEFT HIGH PRESSURE PUMP .
• Refer to INSTALLING THE HIGH-PRESSURE RAIL ON THE LEFT .
• Refer to INSTALLING THE SOUND INSULATION OF THE INJECTORS, LEFT .
• Refer to INSTALLING THE IGNITION COILS OF CYLINDER BANK 2 .
• Refer to INSTALLING IGNITION COIL ON CYLINDER 1 .
• Refer to REMOVING THE ENGINE FROM THE ENGINE SUPPORT BRACKET .
• Refer to INSTALLING THE COMPLETE FRONT AXLE WITH THE ENGINE AND TRANSMISSION .
• Refer to CLEANING THE OIL FILTER ELEMENT AND OIL FILTER HOUSING .
• Refer to INSTALLING THE OIL FILTER ELEMENT .
• Refer to TIGHTENING THE OIL DRAIN PLUG .
• Refer to FILLING ENGINE OIL .