Check/face-grind cylinder head contact surfaces

AR01.30-D-7162AD

10.11.11

ENGINES 900.917 /918 /919 in MODELS 668, 670

Check/face-grind cylinder head contact surfaces

W01.30-1086-09

1 Cylinder head

2 Inlet valves

3 Outlet valve

H Height

J Difference between both inlet valve stem ends

K Valve setback relative to cylinder head contact surface

4 Constant throttle valve

5  Dial indicator

6  Dial indicator holder

	Removing
1	Remove cylinder head (1)		AR01.30-D-5800AD
2	Remove nozzle holder combination		AR07.03-D-6831AD
3	Clean cylinder head (1)
	Checking
4	Measure height (H) of cylinder head (1)	 If the permissible dimension is not reached then the cylinder head (1) must be replaced.
		Height of the cylinder head (1)	*BE01.30-N-1001-02B
5	Inspect sealing surface of cylinder head (1) for porous or damaged points	 If there are porous or damaged locations, face-grind cylinder head separating surface.
6	Inspect flatness of cylinder head (1)	Straightedge	AR01.30-D-5800-12AD
		Permissible variation in flatness of lower separating surface in a longitudinal direction	*BE01.30-N-1002-02B
	Machining
7	Remove intake valves (2) and exhaust valve (3)	 Mark intake valves (2) and exhaust valve (3) relative to installation location.	AR05.30-D-3511AD
8	Remove constant throttle valves (4)		AR01.50-D-1000AD
9	Machine cylinder head contact surface on the combustion chamber side by face grinding it flat	 After stock removal the height of the cylinder head (1) must not be less than the permissible height (H) otherwise replace the cylinder head (1).
		Height of the cylinder head (1)	*BE01.30-N-1001-02B
10	Clean cylinder head (1)
	Measure
11	Insert intake valves (2) and exhaust valve (3) into cylinder head (1)	 Observe marking on intake valves (2) and on exhaust valve (3) relative to the installation location.
12	Measure valve setback to cylinder head contact surface (K) and difference between both inlet valve shaft ends (J) using a dial indicator (5) and dial indicator holder (6)	 The valve setback to cylinder head contact surface (K) and the difference between both intake valve shaft ends (J) must lie within the permissible tolerance.	AR05.30-D-4100-01AD
		Valve setback to cylinder head contact surface (K)	*BE05.30-N-1001-01B
		Permissible difference of intake valves (2) measured between the cylinder head (1) and valve stem end	*BE05.30-N-1014-01B
			*001589532100
			*366589002105
			*343589004000
			*363589022100
		 If the read off test specifications are outside the permissible tolerance, machine or replace the respective valve seat ring.
	Install
13	Install constant throttle valves (4)		AR01.50-D-1000AD
14	Install intake valves (2) and exhaust valve (3)	 Observe marking on the intake valves (2) and on exhaust valve (3) relative to the installation location. If the valve seat ring was machined or replaced, install new intake valves (2) or exhaust valve (3).	AR05.30-D-3511AD
15	Install nozzle holder combination		AR07.03-D-6831AD
16	Install cylinder head (1)		AR01.30-D-5800AD

Check values for cylinder head

Number	Designation			Engine 900.9, 904.9


BE01.30-N-1001-02B	Height of cylinder head	New	mm	107.9...108.1
		after stock removal	mm	106.9
BE01.30-N-1002-02B	Permissible variation in flatness of lower separating surface in a longitudinal direction	over the entire length	mm	0.05
		over a length of 150 mm	mm	0.02

Check values for valves

Number	Designation			Engine 900.9, 924.9, 925.9, 926.9, engine 902.9 without code MS8


BE05.30-N-1001-01B	Valve setback relative to cylinder head contact surface	Inlet	mm	1.1 to 1.5
		Outlet	mm	1.1 to 1.5
BE05.30-N-1014-01B	Permissible difference of intake valves measured between cylinder head and valve stem end		mm	0.3

343 589 00 40 00

Dial indicator holder

Dial indicator

Extension

001 589 53 21 00

363 589 02 21 00

366 589 00 21 05

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