Tightening procedure for crankshaft bearing caps - AR03.20-P-4351-02VA

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ENGINE 272

MODIFICATION NOTES

10.2.10	Value modified: Side crankshaft bearing cap bolt, Stage 1		*BA03.20-P-1002-01D
	Value modified: Side crankshaft bearing cap bolt, Stage 2		*BA03.20-P-1002-01D

CRANKSHAFT BEARING CAP

Number	Designation				Engine 272
BA03.20-P-1001-01D	Bolt for crankshaft bearing cap	M8	Stage 1	Nm	20
BA03.20-P-1001-01D	Bolt for crankshaft bearing cap	M8	Stage 2	∠°	90
BA03.20-P-1002-01D	Side crankshaft bearing cap bolt	M8	Stage 1	Nm	20
BA03.20-P-1002-01D	Side crankshaft bearing cap bolt	M8	Stage 2	∠°	90
BA03.20-P-1003-01D	Bolt for crankshaft bearing cap	M10	Stage 1	Nm	5
			Stage 2	Nm	30
			Stage 3	∠°	90

Tightening sequence for the crankshaft bearing cap and the crankshaft fitted bearing cap

Tighten crankshaft bearing cap (2, 3, 4) and the crankshaft fitted bearing cap (1) individually in numerical sequence. The arrow identifies direction of travel.

Fig 1: Crankshaft Bearing Cap And Fitted Bearing Cap Tightening Sequence - Engine 272

Courtesy of MERCEDES-BENZ USA

Tightening sequence for the bolts for the crankshaft bearing cap and the crankshaft fitted bearing cap

Lubricate bolts for bearing cap at thread and bolt head contact surfaces.
Tighten bolts for bearing cap in the specified sequence.
If no torquing angle wrench is available for the final tightening, the bearing cap bolts can be torqued further by the specified angle in a single operation using a wrench and locking handle. Do not use a flexi-rod torque wrench for tightening in order to avoid any angle errors.
Tighten the screws:
- Tighten bolt 1 (M10) to stage 1.
- Tighten bolt 2 (M10) to stage 1.
- Tighten bolt 3 (M8) to stage 1.
- Tighten bolt 4 (M8) to stage 1.
- Tighten side bolt 5 (final tightening).
- Tighten side bolt 6 (final tightening).
- Tighten bolt 1 (M10) to stage 2.
- Tighten bolt 2 (M10) to stage 2.
- Tighten bolt 3 (M8) to the stage 2 tightening angle (final tightening).
- Tighten bolt 4 (M8) to the stage 2 tightening angle (final tightening).
- Tighten bolt 1 (M10) to the stage 3 tightening angle (final tightening).
- Tighten bolt 2 (M10) to the stage 3 tightening angle (final tightening).
  
  Fig 2: Crankshaft Bearing Cap And Bolts
  Courtesy of MERCEDES-BENZ USA