Installing the crankshaft (B48 setting with spring balance)

• Insert and install the crankshaft (1).

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  NOTE: TECHNICAL INFORMATION 
  The crankshaft bearing cap, main bearing shell and guide bearing shell are aligned with each other.
  Always install the crankshaft bearing cap, main bearing shells and guide bearing shells in the cylinder from which they were removed.

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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 clearance of the crankshaft B42/B46/B48

min. 0.060 mm

max. 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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• Move or adjust the crankshaft (2) to the TDC setting  .
• 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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  NOTE: The description is provided only at one component. The procedure is the same for all other components.
• Observe the correct fit of special tool 2 288 054  in the guides (1) of counterbalance shafts (2).
• If necessary, turn the crankshaft slightly.

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Check 

• Check whether the marks of the idler gear are positioned perpendicular  to the sealing surface (1) of the oil pan and position the idler correctly  , as required.

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  Result 

  » Marks are perpendicular to the sealing surface (1) of the oil pan.

  Measure 

  • Carry out the following step.
• Tighten special tool 2 288 054  .
  TIGHTENING TORQUE 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.
  TIGHTENING TORQUE SPECIFICATION
  
  

  Drive wheel to counterbalance shafts
  Screw Replace screws.	1. Tightening torque	20 Nm
  	2. Angle of rotation	180°

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• Replace the idler gear (1).

  Parts:  Intermediate wheel

• Feed in and install the idler gear (1).
• Mount the idler gear (1) so that the QR code and the mark is perpendicular  to the sealing surface of the oil pan (upwards).

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• Tighten the nut (1) hand-tight.
• Release the nut (1) until the idler gear can be moved.

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Check 

• Check whether the marks of the driving gear are positioned perpendicular  to the sealing surface (1) of the oil pan and position the driving gears correctly  , as required.

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  Result 

  » Marks are perpendicular to the sealing surface (1) of the oil pan.

  Measure 

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

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• Prepare a commercially available spring balance (1).

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  NOTE: TECHNICAL INFORMATION 
  Complete the following steps with the help of a support person.
• Fit the wrench (1) on the screw of the counterbalance shaft on the exhaust side.
• Fasten the spring balance (2) with a cable strap (3) onto the wrench (1).

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• Pretension the spring balance in the arrow direction.
  TIGHTENING TORQUE SPECIFICATION
  
  

  Preloading the spring balance to tighten the idler gear
  Spring balance	Preload	30-40N

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• Move the idler gear (1) onto the driving gear of the counterbalance shaft and the crankshaft in the arrow direction up to the stop.
• Tighten the idler gear (1).
  TIGHTENING TORQUE SPECIFICATION
  
  

  Idler gear to crankcase
  M12X1.5	1. Tightening torque	10 Nm
  	2. Angle of rotation	45°

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• Turn the crankshaft using special tool 0 493 380 (11 6 480) by 90 degrees in the arrow direction. 

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• Move the driving gear of counterbalance shaft on the intake side  back and forth in the arrow direction.

  The backlash between the gears must be audible and perceptible.

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• Move the idler gear of the counterbalance shaft on the exhaust side  back and forth in the arrow direction.

  The backlash between the gears must be audible and perceptible.

  The backlash on the exhaust side should be similar to the backlash on the intake side. 

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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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