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

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ENGINE 642

MODIFICATION NOTES

28.4.10	Value changed: Crankshaft bearing cap bolt on crankshaft bearing body		*BA03.20-P-1001-01E
17.5.10	Altered tightening sequence for crankshaft bearing cap	Operation steps 2 to 6

CRANKSHAFT BEARING CAP

Number	Designation				Engine 642
BA03.20-P-1001-01E	Bolt, crankshaft bearing cap bolt to crankshaft bearing body	M10	Stage 1	Nm	5
			Stage 2	Nm	35
			Stage 3	∠°	95
			Stage 4	∠°	95
BA03.20-P-1002-01E	Lateral bolt connecting crankcase to crankcase bearing cap	M10	Stage 1	Nm	53
BA03.20-P-1002-01E	Lateral bolt connecting crankcase to crankcase bearing cap	M10	Stage 2	∠°	95

Always maintain work sequence to prevent damaging engine.

Moisten the thread and head contact surface of the bolts of the crankshaft bearing caps with oil.
Tighten crankshaft bearing cap bolts on crankshaft bearing block to first stage torque according to tightening instructions.
Tighten crankshaft housing side bolts on crankshaft bearing cap to first stage torque according to tightening instructions.
This centers the crankshaft bearing cap in the cylinder crankcase.

Fig 1: Crankshaft Bearing Cap Bolts Tightening Sequence - Shown On Engine 642
Courtesy of MERCEDES-BENZ USA
Completely tighten crankshaft bearing cap bolts on crankshaft block according to tightening instructions.
Loosen crankshaft bearing housing side bolts on crankshaft bearing cap again.
This releases any tension present.
Completely tighten side bolts of crankshaft housing on crankshaft bearing cap according to tightening torque.
Turn the crankshaft.
Check for unobstructed movement.

Fig 2: Turning Crankshaft
Courtesy of MERCEDES-BENZ USA