Tightening procedure for crankcase bottom section - AR03.20-P-4351-05AMG

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ENGINE 156

CRANKSHAFT BEARING CAP

Number	Designation				Engine 156
BA03.20-P-1001-01J	Crankshaft bearing cap bolt (lower section of crankcase/main bearing threaded connection)	M9	Stage 1	Nm	20
			Stage 2	Nm	32
			Stage 3	∠°	90
			Stage 4	∠°	90
			Stage 5		Releasing
			Stage 6	Nm	20
			Stage 7	Nm	32
			Stage 8	∠°	90
			Stage 9	∠°	90
		M10	Stage 1	Nm	20
			Stage 2	Nm	40
			Stage 3	∠°	90
			Stage 4	∠°	90
			Stage 5		Releasing
			Stage 6	Nm	20
			Stage 7	Nm	40
			Stage 8	∠°	90
			Stage 9	∠°	90

Oil bolts of bearing caps on threads and bolt head contact surfaces.
Always replace bolts.
Tighten bolts of bearing caps.
Observe tightening specification and tightening torque.

If an angle tightener is not available, continue turning bolts with a socket wrench and breaker bar by the specified angle in one pull. Do not use a flexi-rod torque wrench for tightening in order to avoid any angle errors.

Tightening procedure for lower crankcase section

Fig 1: Lower Crankcase Section Bolts Tightening Sequence - Shown On Engine 156

Courtesy of MERCEDES-BENZ USA

Tightening specification		Stage (per bolt)
1	Alternate pre-tightening of bolts	Stage 1
2	Alternate continued tightening of bolts	Stage 2
3	Alternate angle of rotation tightening of bolts	Stage 3
4	Alternate angle of rotation tightening of bolts	Stage 4
5	Alternate loosening of bolts	Stage 5
6	Alternate pre-tightening of bolts	Stage 6
7	Alternate continued tightening of bolts	Stage 7
8	Alternate angle of rotation tightening of bolts	Stage 8
9	Alternate angle of rotation tightening of bolts	Stage 9