Installing the crankshaft (B48 technical update 0/1)
CAUTION:
Heavy component.
Heavy components can lead to injury or damage.
Heavy components can lead to injury or damage.
- Remove and install heavy components with the aid of another person/other persons.
- Insert and install the 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. - Observe numbering on the main bearing cap.
- Position the main bearing cap.
- Tighten the screws in the sequence (1) - (10).
TIGHTEN TORQUES SPECIFICATION
| 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.
TECHNICAL DATA SPECIFICATION
| Axial play of crankshaft | |
| Min. Max. |
0.060 mm 0.250 mm |
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.
- 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).
- 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.
- Rotate the crankshaft to the TDC of the first cylinder.
- Mount the special tool 2 288 054
and abut the screws (1).NOTE: The description is for one component only. The procedure is identical for all further 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.
- Tighten special tool 2 288 054
.TIGHTEN TORQUES SPECIFICATION
Special tool 2 288 054 to crankshaft Tightening torque 20 Nm - Tighten the screw (1) of the counterbalance shaft for the intake side.TIGHTEN TORQUES SPECIFICATION
Drive wheel to counterbalance shafts Screw
Replace screws.Tightening torque 20 Nm Angle of rotation 180° - Loosen screws (1).
- Guide the special tool 2 288 054
out and remove.
- Vehicles up to year of manufacture 07/16
- Feed in and install the idler gear (1).
- 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.
- Vehicles from year of manufacture 07/16
- Feed in and install the idler gear (1).
- 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.
- Bring the idler gear (1) into contact with the gear (2) of the crankshaft in arrow direction .
- Tighten nut (3).TIGHTEN TORQUES SPECIFICATION
Idler gear to crankcase M12X1.5 Tightening torque 10 Nm Angle of rotation 45° - 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).