Installing the crankshaft (B48 technical update 0/1)

CAUTION: Heavy component.
Heavy components can lead to injury or damage.

Remove and install heavy components with the aid of another person/other persons.

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Guide in and install crankshaft (1).

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.

Fig 1: Main Bearing Caps Screws Tightening Sequence

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

TIGHTENING TORQUES SPECIFICATION

Main bearing cap to crankcase
M10x1.5 Replace screws.	1. Jointing 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.

TECHNICAL DATA - AXIAL PLAY OF CRANKSHAFT SPECIFICATION

Axial play of crankshaft
	min. 0.060 mm
	max. 0.250 mm

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Result

» The side clearance has been exceeded.

Measure

Replace worn components.

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

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Bring or adjust crankshaft (2) to the TDC position .
Position counterbalance shaft (1) on the intake side in the direction of the arrow on crankshaft (2).
The mark on gear (1) on the intake side of the counterbalance shaft must point upwards, perpendicular to the sealing surface of oil sump (3).

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Replace the screw (1).
Parts : Screw
Screw, screw (1) into the counterbalance shafts on the intake side.
Do not tighten screw (1) since otherwise the counterbalance shafts can no longer be positioned 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 bolts (1).

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NOTE: The description is for one component only. The procedure is identical for all further components.

Make sure the special tool 2 288 054 is correctly fitted in the guides (1) of the counterbalance shafts (2).
If necessary, turn the crankshaft slightly.
Tighten special tool 2 288 054 .

TIGHTENING TORQUES SPECIFICATION

Special tool 2 288 054 to crankshaft
Tightening torque	20 Nm

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

TIGHTENING TORQUES SPECIFICATION

Drive wheel to counterbalance shafts
Screw Replace screws.	1. Tightening torque	20 Nm
	2. 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
Guide in and install intermediate wheel (1).

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Vehicles up to year of manufacture 07/16
The marks on gear (1) and also on intermediate wheel (2) must point upwards, perpendicular to the oil sump sealing surface (3).
Marking on intermediate wheel (2) of the counterbalance shaft at exhaust side: a square.
Marking on the gear (1) of the counterbalance shaft, exhaust side: two squares.

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Vehicles from year of manufacture 07/16
Guide in and install intermediate wheel (1).

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Vehicles from year of manufacture 07/16
The marks on gear (1) and also on intermediate wheel (2) must point upwards, perpendicular to the sealing surface of oil sump (3).
Marking on intermediate wheel (2) of the counterbalance shaft at exhaust side: a square.
Marking on gear (1) on counterbalance shaft, exhaust side: a triangle.

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Move intermediate wheel (1) in the direction of the arrow to gear (2) of the crankshaft.
Tighten nut (3).

TIGHTENING TORQUES SPECIFICATION

Idler gear to crankcase
M12X1.5	1. Tightening torque	10 Nm
	2. 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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