Check/face-grind cylinder head contact surfaces · ar0130d7162b · Mercedes-Benz WIS

AR01.30-D-7162B

Check/face-grind cylinder head contact surfaces

10.11.11

ENGINES 601.943 in MODEL 901, 902, 903, 904

Check/face-grind cylinder head contact surfaces

D01.30-0019-06

a Valve setback with new valves and valve seat rings

B Projection of prechamber

H Height of cylinder head

 	Remove/install
	Only face cylinder head contact surface if porous or damaged points are present. It is not necessary to rework minor variations in the flatness in the longitudinal direction. These are evened out again when the cylinder head is tightened
1	Remove cylinder head		AR01.30-D-5800B
2	Remove valve springs and valve stem seals		AR05.30-D-3510-02A
			*111589256100
			*601589015900
			*606589003700
3	Remove valves
4	Remove prechamber		AR01.30-S-5402A
5	Inspect cylinder head contact surface for flatness, porous or damaged points		*BE01.30-N-1002-02D
		Steel rule
6	Inspect hardness of cylinder head contact surface	 If a cylinder head has been overheated, this can result in a change in the microstructure. Facing only produces a leaktight bond between cylinder head-cylinder head gasket-crankcase if a certain minimum hardness is achieved	AR01.30-D-7162-02A
			*BE01.30-N-1008-02D
		Impact hardness tester, poldi system
7	Measure height of cylinder head (inspection dimension H)	 Note measurement obtained	*BE01.30-N-1001-02D
8	Face contact surface of cylinder head		*BE01.30-N-1004-02D
		 The stock removal at the cylinder head and at the crankcase together must not be more than 0.5 mm. If the cylinder crankcase has already been remachined, the material removed on the cylinder head separation surface should not exceed of maximum of 0.3 mm. Never machine the upper separation surface of the cylinder head, otherwise the basic bore for the camshaft bearing would be changed.
		Old stock - surface grinding machine (cylinder head) gotis://A_01_14.0
9	Once again measure height of cylinder head (inspection dimension H)	Measure stock removal	*BE01.30-N-1001-02D
10	Measure valve setback (inspection dimension a)		AR05.30-D-4100-01A
			*BE01.30-N-1006-02D
			*BE01.30-N-1010-02D
			*001589532100
			*343589004000
		Depth gage
11	Re-work valve seats to match stock removal at cylinder head		AR05.30-D-4511B
12	Install prechamber		AR01.30-S-5402A
		 Pay attention to projection of prechamber "B", compensate if necessary with a spacer ring. Spacer rings are available in the thicknesses of 0.3 mm, 0.6 mm and 1.0 mm	*BE01.30-N-1003-03A
13	Install in the reverse order

Check values for cylinder head

Number	Designation			Engine 601.943


BE01.30-N-1001-02D	Height of cylinder head (H)	New	mm	142.9 to 143.1
		Wear limit after machining (stock removal max. 0.5 mm)	mm	142.4 to 142.6
		See picture		AR01.30-D-7162B
BE01.30-N-1002-02D	Unevenness of contact surface	Longitudinal direction	mm	0.08
		Transverse direction	mm	0.0
BE01.30-N-1004-02D	Peak-to-valley height		mm	0.006
BE01.30-N-1006-02D	Valve setback (a) with new valves and new valve seat rings	Exhaust valve	mm	0.1 to 0.7
		Intake valve	mm	0.1 to 0.7
		See picture		AR01.30-D-7162B
BE01.30-N-1008-02D	Hardness of cylinder head contact surface in area of sealing bead of cylinder head gasket		HB	>70
		See picture		AR01.30-D-7162-02A
BE01.30-N-1010-02D	Distance from end of valve stem to base of camshaft bearing (T)		mm	20.4 to 21.4
		See picture		AR05.30-D-4100-01A