Installing the crankshaft (B48 technical update 0/1)

• Insert and install the crankshaft (1).

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• Observe numbering on the main bearing cap.
• Position the main bearing cap.
• Tighten the screws in the sequence (1) - (10).

Main bearing cap to crankcase
M10x1.5 Replace screws.	1. Joining torque	25 Nm
	2. Angle of rotation	60°
	3. Angle of rotation	60°

Checking the crankshaft side clearance 

Check 

• Attach the dial gauge 0 493 144 (11 6 251)  with the tripod 0 493 145 (11 6 252)  to the engine and measure the side clearance of the crankshaft.

Axial play of crankshaft
Min.  Max	0.060 mm 0.250 mm

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Result 

» The side clearance is exceeded.

Measure 

• Replace worn components.

• Feed out a lint-free cleaning cloth (1) between the counterbalance shaft (2) on the intake side and crankcase (3) and remove it.
• Make sure that the needle bearing (4) is not damaged.

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• Put crankshaft (2) in OT position  or adjust.
• Position counterbalance shaft (1) of inlet side on the crankshaft (2) in arrow direction. 

• The mark on the gear (1) of the intake for the counterbalance shaft must point upwards, vertical  to the oil sump sealing surface (3).

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• Replace the screw (1).

  Parts:  Screw

• Screw the screw (1) into the counterbalance shafts of the inlet side.
• Do not  tighten screw (1) as otherwise it may not be possible to position the counterbalance shafts in the next step.

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• Rotate the crankshaft to the TDC of the first cylinder. 
• Mount the special tool 2 288 054  and abut the screws (1).

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• Observe the correct fit of special tool 2 288 054  in the guides (1) of counterbalance shafts (2).
• If necessary, turn the crankshaft slightly.

• Tighten special tool 2 288 054  .
  TIGHTEN TORQUES SPECIFICATION
  
  

  Special tool 2 288 054 to crankshaft
  	Tightening torque	20 Nm

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• Tighten the screw (1) of the counterbalance shaft for the intake side.

Drive wheel to counterbalance shafts
Screw Replace screws.	Tightening torque	20 Nm
	Angle of rotation	180°

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• Loosen screws (1).
• Guide the special tool 2 288 054  out and remove.

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• Vehicles up to year of manufacture 07/16 
• Feed in and install the idler gear (1).

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• Vehicles up to year of manufacture 07/16 
• The marks on gear (1) and on idler gear (2) must point upwards, perpendicular  to the oil pan sealing surface (3).
• Marking on idler gear (2) of the counterbalance shaft at exhaust side: one rectangle.
• Marking on the gear (1) of the counterbalance shaft at exhaust side: two rectangles.

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• Vehicles from year of manufacture 07/16 
• Feed in and install the idler gear (1).

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• Vehicles from year of manufacture 07/16 
• The marks on the gear (1) the idler gear (2) must point upwards, vertical  to the oil sump sealing surface (3).
• Marking on idler gear (2) of the counterbalance shaft at exhaust side: one rectangle.
• Marking on gear (1) on counterbalance shaft at exhaust side: a triangle.

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• Bring the idler gear (1) into contact with the gear (2) of the crankshaft in arrow direction. 
• Tighten nut (3).

Idler gear to crankcase
M12X1.5	Tightening torque	10 Nm
	Angle of rotation	45°

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• Replace the sealing cap (1).

  Parts:  Sealing cap

• Make sure the O-rings of the sealing cap (1) are fitted correctly.
• Mount both sealing caps (1).

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