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

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ENGINE 152, 157, 276, 278

ENGINE 157

CRANKSHAFT BEARING CAP

Number	Designation				Engine 152	Engine 157
BA03.20-P-1001-01D	Bolt for crankshaft bearing cap	M8	Stage 1	Nm	20	20
BA03.20-P-1001-01D	Bolt for crankshaft bearing cap	M8	Stage 2	∠°	90	90

CRANKSHAFT BEARING CAP

Number	Designation				Engine 276	Engine 278
BA03.20-P-1001-01D	Bolt for crankshaft bearing cap	M8	Stage 1	Nm	20	20
BA03.20-P-1001-01D	Bolt for crankshaft bearing cap	M8	Stage 2	∠°	90	90

CRANKSHAFT BEARING CAP

Number	Designation				Engine 152	Engine 157
BA03.20-P-1002-01D	Side crankshaft bearing cap bolt	M8	Stage 1	Nm	20	20
BA03.20-P-1002-01D	Side crankshaft bearing cap bolt	M8	Stage 2	∠°	90	90

CRANKSHAFT BEARING CAP

Number	Designation				Engine 276	Engine 278
BA03.20-P-1002-01D	Side crankshaft bearing cap bolt	M8	Stage 1	Nm	20	20
BA03.20-P-1002-01D	Side crankshaft bearing cap bolt	M8	Stage 2	∠°	90	90

CRANKSHAFT BEARING CAP

Number	Designation				Engine 152	Engine 157
BA03.20-P-1003-01D	Bolt, crankshaft bearing cap	M10	Stage 1	Nm	5	5
			Stage 2	Nm	30	30
			Stage 3	∠°	90	90

CRANKSHAFT BEARING CAP

Number	Designation				Engine 276	Engine 278
BA03.20-P-1003-01D	Bolt, crankshaft bearing cap	M10	Stage 1	Nm	5	5
			Stage 2	Nm	30	30
			Stage 3	∠°	90	90

Tightening sequence of crankshaft main bearing cap (1a) and the crankshaft bearing cap (2a, 3a, 4a) on engine 276

Tighten crankshaft fitted bearing cap (1a) and crankshaft bearing cap (2a, 3a, 4a, a) individually in numerical sequence.
Do not use an impact wrench/driver or compressed air tool to screw in the screw/bolts (1 to 6).

The threaded holes are damaged otherwise.

The arrow points in the direction of travel. If no angle tightener is available at the final tightening stage, the screw/bolts can be turned further using a socket wrench and locking handle all in a single operation. Do not use a bending rod torque wrench for tightening in order to avoid any angular errors.

Fig 1: Crankshaft Fitted Bearing Cap And Crankshaft Bearing Caps Tightening Sequence - Shown On Engine 276
Courtesy of MERCEDES-BENZ USA
Tighten screw/bolts (1 to 6) of the crankshaft bearing cap (1a to 4a) to stage 1 in numerical sequence.
Tighten screw/bolts (1 to 6) of the crankshaft bearing cap (1a to 4a) to stage 2 in numerical sequence.
Tighten screw/bolts (1 to 2) of the crankshaft bearing cap (1a to 4a) to stage 3.

Fig 2: Tightening Crankshaft Bearing Cap Screw/Bolts
Courtesy of MERCEDES-BENZ USA

Tightening sequence of crankshaft main bearing cap (1a) and the crankshaft bearing cap (2a, 3a, 4s, 5a) on engine 152, 157, 278
Tighten crankshaft fitted bearing cap (3a) and crankshaft bearing cap (1a, 2a, 4a, 5a) individually in numerical sequence.
Do not use an impact wrench/driver or compressed air tool to screw in the screw/bolts (1 to 6).

The threaded holes are damaged otherwise.

The arrow points in the direction of travel. If no angle tightener is available at the final tightening stage, the screw/bolts can be turned further using a socket wrench and locking handle all in a single operation. Do not use a bending rod torque wrench for tightening in order to avoid any angular errors.

Fig 3: Crankshaft Fitted Bearing Cap And Crankshaft Bearing Cap Tightening Sequence - Shown on Engine 152, 157, 278
Courtesy of MERCEDES-BENZ USA
Tighten screw/bolts (1 to 6) of the crankshaft bearing cap (1a to 5a) to stage 1 in numerical sequence.
Tighten screw/bolts (1 to 6) of the crankshaft bearing cap (1a to 5a) to stage 2 in numerical sequence.
Tighten screw/bolts (1 to 2) of the crankshaft bearing cap (1a to 5a) to stage 3.

Fig 4: Tightening Crankshaft Bearing Cap Screw/Bolts
Courtesy of MERCEDES-BENZ USA