Tightening diagram for cylinder head bolts - AR01.30-P-5800-01PI

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CYLINDER HEAD

Number	Designation			Engine 642
BA01.30-P-1001-01S	Bolt for cylinder head on crankcase	M8x35	Nm	20
BA01.30-P-1002-01S	Bolt for cylinder head on crankcase M12	1st stage	Nm	10
		2nd stage	Nm	60
		Step 3	∠°	90
		4th stage	∠°	90
		Step 5	∠°	90

Tightening pattern with bolt assignment, shown on the left and right cylinder head

Fig 1: Identifying Tightening Pattern & Bolt Assignment

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The order of tightening for the left and the right cylinder head given below must be followed in order to avoid any consequent damages.

Tighten bolts (10) according to stage 1 .
Tighten bolts (11) .
Tighten bolts (10) according to stage 2 .
Retighten bolts (11) .
Tighten bolts (10) according to stage 3 .
Retighten bolts (11) .
Tighten bolts (10) according to stage 4 .
Retighten bolts (11) .
Tighten bolts (10) according to stage 5 .
Retighten bolts (11) .
Use the reverse sequence to loosen the bolts (10 to 11).