Check/face-grind cylinder head contact surfaces

AR01.30-W-7162C

10.11.11

ENGINES 457.9 in MODEL 375, 944
Cylinder head without inductive hardening

Check/face-grind cylinder head contact surfaces

W01.30-1073-06

1 Cylinder head

2 Inlet valves

3 Exhaust valves

4 Constant throttle valve

5  Dial indicator

6  Dial indicator holder

B Valve setback

H Height of cylinder head

Modification notes

18.7.06

Work procedure revised.

	Removing
1	Remove cylinder head (1)		AR01.30-W-5800C
2	Remove nozzle holder combination		AR07.03-W-6831D
3	Clean cylinder head (1)	 Only clean cylinder head sealing surface by scraping.
	Check
4	Measure height of cylinder head (H) with vernier caliper	 If the permissible height of the cylinder head (H) is not reached: 	*BE01.30-N-1001-02Q
		Install new cylinder head (1) with inductive hardening.
5	Measure valve setback (B) at both intake valves (2) and at exhaust valve (3) and note		AR05.30-W-4100-01D
			*BE05.30-N-1003-01Q
			*001589532100
			*541589004000
		 If read off test value before and after possible face machining is not within permissible tolerance: 
		Install new cylinder head (1) with inductive hardening.
6	Inspect flatness of cylinder head contact surface (combustion chamber side)		*BE01.30-N-1002-02Q
		Straightedge
	Machining
7	Remove intake valves (2) and exhaust valves (3)	 If intake valves (2) and exhaust valves (3) are used again, mark installation location relative to the intake valves (2) and exhaust valves (3).	AR05.30-W-3511C
8	Remove constant throttle valve (4)		AR01.50-W-1000C
9	Machine cylinder head contact surface (on the combustion chamber side) by face grinding it flat	 The height of cylinder head (H) must not be less than smallest permissible height after stock removal.	*BE01.30-N-1001-02Q
		The surface quality of the cylinder head contact surface must be maintained.	*BE01.30-N-1003-02Q
10	Clean cylinder head (1)	 No dirt should find its way into the bores for engine oil, coolant, push rods and cylinder head bolts otherwise engine damage can occur.
	Install
11	Install intake valves (2) and exhaust valves (3)	 Observe identification of intake valves (2) and exhaust valves (3).	AR05.30-W-3511C
12	Measure valve setback (B) at both inlet valves (2) and at exhaust valves (3)	 If measurement obtained is not within permissible tolerance: 	AR05.30-W-4100-01D
		Install new cylinder head (1) with inductive hardening.
			*BE05.30-N-1003-01Q
			*001589532100
			*541589004000
13	Install constant throttle (4)		AR01.50-W-1000C
14	Install nozzle holder combination		AR07.03-W-6831D
15	Install cylinder head (1)		AR01.30-W-5800C

Check values for cylinder head

Number	Designation			Engine 457.9 without inductive hardening on the cylinder head


BE01.30-N-1001-02Q	Height of cylinder head	New	mm	113.85 to 114.15
		after stock removal	mm	113.5
BE01.30-N-1002-02Q	Permissible variation of flatness of lower contact surface	Wear dimension	mm	0.1
BE01.30-N-1003-02Q	Peak-to-valley height (Rz) of cylinder head contact surface	Peak-to-valley height Rz	μm	8
		Wave depth Wt	μm	10

Check values for valves

Number	Designation			Engine 457.9


BE05.30-N-1003-01Q	Valve setback relative to cylinder head contact surface	New	mm	0.7 to 1.1
		permissible value	mm	1.6

541 589 00 40 00

Dial gauge holder

Dial indicator

001 589 53 21 00

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