Remove/install valves

AR05.30-D-3511AD

22.6.10

ENGINES 900.917 /918 /919 in MODELS 668, 670

W05.30-1097-09

1 Inlet valves

2 Outlet valve

3 Cylinder head

J Difference between both inlet valve stem ends

K Valve setback relative to cylinder head contact surface

4  Dial indicator

5  Dial indicator holder

W05.30-1115-06

2 Outlet valve

3 Cylinder head

6 Valve guides

7 Valve stem seal

8 Valve spring

9 Valve spring retainer

10 valve locks

11  Drift

12  Cylinder brush

 	Remove/install
1	Remove nozzle holder combination		AR07.03-D-6831AD
2	Remove cylinder head (3)		AR01.30-D-5800AD
3	Measure valve setback to cylinder head contact surface (K) and difference between both inlet valve shaft ends (J) using a dial indicator (4) and dial indicator holder (5)	 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
		Machine or replace the relevant valve seat ring if the read off test specifications are outside the permissible tolerance.
		Valve setback to cylinder head contact surface (K)	*BE05.30-N-1001-01B
		Permissible difference of intake valves (1) measured between the cylinder head (3) and valve stem end	*BE05.30-N-1014-01B
			*001589532100
			*366589002105
			*343589004000
			*363589022100
4	Remove valve springs (8) and valve stem seals (7)	 Installation: Use new valve stem seals (7).	AR05.30-D-3510-02AD
		Ensure correct seating of the valve locks (10) in the valve spring retainer (9) and in grooves on the valve stem.
			*210589004000
			*541589006100
			*606589003700
5	Mark intake valves (1) and exhaust valve (2) relative to cylinder head (3)
6	Remove intake valves (1) and exhaust valve (2) from cylinder head (3)
7	Clean valve guides (6) using cylinder brush (12)		*000589106800
	Checking
8	Check inside diameter of the valve guides (6) with drift (11) for wear.	Inside diameter (machining dimension)	*BE05.30-N-1003-02B
			*102589002300
		 If the side marked "+" of drift (11) can be inserted in valve guide (6): 
		Replace corresponding valve guide (6).	AR05.30-D-3731AD
9	Check valve seat rings in cylinder head (3)	 The valve seat rings must not have any surface damage and must not be burnt; machine or replace valve seat rings if necessary.
10	Check intake valves (1) and exhaust valve (2) for wear	 The valve stems must have no surface damage. The grooves in valve locks (10) must not be worn and the chrome layer on valve stems must not be damaged. The valve seats must not be burnt; replace the respective intake valves (1) or respective exhaust valve (2) if necessary.
11	Install in the reverse order

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