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

Engine 254.9, 256.9

Topical note

Notes on threaded connections fastened using a tightening angle-based tightening process

MODIFICATION NOTES

27.02.2020	Screw, cylinder head to crankcase/timing case		BA01.30-P-1004-01MRT
15.05.2020	Operation steps added.	Operation steps 7-13
16.07.2020	Screw, cylinder head to crankcase/timing case		BA01.30-P-1003-01EA

CYLINDER HEAD

Number	Designation				Engine 254
BA01.30-P-1003-01EA	Screw, cylinder head to crankcase/timing case	M8		Nm	20
		M11	Stage 1	Nm	10
			Stage 2	Nm	50
			Stage 3	∠°	90
			Stage 4	∠°	90
			Stage 5	∠°	90
			Stage 6	∠°	90

CYLINDER HEAD

Number	Designation				Engine 256.9
BA01.30-P-1004-01MRT	Screw, cylinder head to crankcase/timing case	M8		Nm	20
		M11	Stage 1	Nm	10
			Stage 2	Nm	40
			Stage 3	∠°	90
			Stage 4	∠°	90
			Stage 5	∠°	90

Courtesy of MERCEDES-BENZ USA

Engine 256.9

Tighten screws (1-14) in ascending numerical order to stage 1 Engine 256.9 .
Tighten screws (1-14) in ascending numerical order to stage 2 Engine 256.9 .
Tighten screws (1-14) in ascending numerical order to stage 3 Engine 256.9 .
Tighten screws (1-14) in ascending numerical order to stage 4 Engine 256.9 .
Tighten screws (1-14) in ascending numerical order to stage 5 Engine 256.9 .
Tighten screws (15-19) in ascending numerical order Engine 256.9 .
Screws (1-14) = M11 Screws (15-19) = M8
Tighten screws (1-10) in ascending numerical order to stage 1 Engine 254.9 .
Tighten screws (1-10) in ascending numerical order to stage 2 Engine 254.9 .
Tighten screws (1-10) in ascending numerical order to stage 3 Engine 254.9 .
Tighten screws (1-10) in ascending numerical order to stage 4 Engine 254.9 .
Tighten screws (1-10) in ascending numerical order to stage 5 Engine 254.9 .
Tighten screws (1-10) in ascending numerical order to stage 6 Engine 254.9 .
Tighten screws (11-15) in ascending numerical order Engine 254.9 .
Engine 254.9

Screws (1-10) = M11 Screws (11-15) = M8

Courtesy of MERCEDES-BENZ USA