Installing piston with connecting rod

Aligning piston rings 

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
• For N63T3 installation is only permitted in the following combinations of connecting rod bearing shells (1). 

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  • 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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  NOTE: TECHNICAL INFORMATION 
  Maintain conditions of absolute cleanliness.
• 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.
• 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.

  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)  .

Connecting rod bolts, for new connecting rod

M9x1.25 Screw. Suction off crack surfaces.

Joining torque  5 Nm Joining torque  20 Nm Joining torque  30 Nm Angle of rotation  75°

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Screw connection, for new connecting rod bolts only
M9x1.25 Replace screws. Suction off crack surfaces.	Tightening torque  5 Nm Tightening torque  20 Nm Tightening torque  30 Nm Angle of rotation  75° Unscrew all bolts.  180° Tightening torque  5 Nm Tightening torque  20 Nm Tightening torque  30 Nm Angle of rotation  75° Unscrew all bolts.  180° Tightening torque  5 Nm Tightening torque  20 Nm Tightening torque  30 Nm 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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