Tightening Procedure For Cylinder Head Bolts - AR01.30-P-5800-01MNA

Engine 176, 177, 178

CYLINDER HEAD

Number	Designation				Engine 176	Engine 177
BA01.30-P-1001-01N	Bolt, cylinder head to crankcase	M7		Nm	15	15
		M11	Stage 1	Nm	40	40
			Stage 2	∠°	90	90
			Stage 3	∠°	90	90
			Stage 4	∠°	90	90

CYLINDER HEAD

Number	Designation				Engine 178
BA01.30-P-1001-01N	Bolt, cylinder head to crankcase	M7		Nm	15
		M11	Stage 1	Nm	40
			Stage 2	∠°	90
			Stage 3	∠°	90
			Stage 4	∠°	90

Tightening sequence indicated for left and right cylinder head must be adhered to under all circumstances.

Damage will occur otherwise.

To remove the cylinder head bolts (1 to 11), use the reverse tightening order.

Tighten cylinder head bolts (1 to 10) to stage 1. .
Tighten cylinder head bolts (1 to 10) to stage 2 .
Tighten cylinder head bolts (1 to 10) to stage 3 .
Tighten cylinder head bolts (1 to 10) to stage 4. .
Tighten cylinder head bolts (11). .

Courtesy of MERCEDES-BENZ USA