Tightening Procedure For Crankshaft Bearing Caps - AR03.20-P-4351-02MNA

Engine 176, 177, 178

CRANKSHAFT

Number	Designation				Engine 176	Engine 177
BA03.20-P-1001-01N	Side bolt to crankshaft bearing cap	M8x35	Stage 1	Nm	20	20
		M8x35	Stage 2	∠°	90	90
		M8x50	Stage 1	Nm	25	25
		M8x50	Stage 2	∠°	90	90

CRANKSHAFT

Number	Designation				Engine 178
BA03.20-P-1001-01N	Side bolt to crankshaft bearing cap	M8x35	Stage 1	Nm	20
		M8x35	Stage 2	∠°	90
		M8x50	Stage 1	Nm	25
		M8x50	Stage 2	∠°	90

CRANKSHAFT

Number	Designation				Engine 176	Engine 177
BA03.20-P-1002-01N	Bolt, crankshaft bearing cap to crankcase	M9	Stage 1	Nm	25	25
		M9	Stage 2	∠°	90	90
		M10	Stage 1	Nm	5	5
			Stage 2	Nm	35	35
			Stage 3	∠°	90	90

CRANKSHAFT

Number	Designation				Engine 178
BA03.20-P-1002-01N	Bolt, crankshaft bearing cap to crankcase	M9	Stage 1	Nm	25
		M9	Stage 2	∠°	90
		M10	Stage 1	Nm	5
			Stage 2	Nm	35
			Stage 3	∠°	90

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.

Courtesy of MERCEDES-BENZ USA
Tighten screw/bolts (1 to 6) of the bearing cap (1a to 5a) to stage 1 in numerical sequence Engine 176, 177.980, 178.9
Engine 176, 177.980, 178.9
Tighten screw/bolts (1 to 6) of the bearing cap (1a to 5a) to stage 2 in numerical sequence Engine 176, 177.980, 178.9
Engine 176, 177.980, 178.9
Tighten screw/bolts (1 to 6) of the bearing cap (1a to 5a) to stage 3 in numerical sequence Engine 176, 177.980, 178.9

Engine 176, 177.980, 178.9

Courtesy of MERCEDES-BENZ USA