Replace valve stem seals.

AR05.30-W-3510J

23.11.10

ENGINES 900.9 in MODELS 375.1, 970, 972, 975, 976

ENGINES 902.9 in MODEL 375.3, 950.5 /6, 952.5 /6, 953.6, 954.5

ENGINES 902.9 in MODEL 957 except CODE (MS8) Natural gas engine

ENGINES 902.9 in MODELS 375.1, 970, 972, 974, 975, 976

ENGINES 924.9 in MODELS 958.0, 970, 972, 974, 975, 976

ENGINES 925.9 in MODELS 970, 972, 974

ENGINES 926.9 in MODEL 958.0

ENGINES 926.9 in MODEL 950.5 /6, 952.5 /6, 953.6, 954.5, 957, 958.2

W05.30-1105-08

1 Valve stem seal

2 Valve guide

5 Valve spring

6  Assembly cartridge guide

3 Conical piece

4 Valve spring retainer

W05.30-1098-11

2 Valve guide

7  Drift

8  Cylinder brush

W05.30-1107-11

9 Outlet valve

10 Inlet valves

	Removing
1	Remove nozzle holder combination		AR07.03-W-6831J
2	Remove cylinder head	Model 375, 950, 952, 953, 954, 958, 970, 972, 974, 975, 976	AR01.30-W-5800J
		Model 957	AR01.30-W-5800JB
3	Remove valve springs (5) and valve stem seals (1)		AR05.30-W-3510-02J
		 Magnetic pin	*210589004000
		 Valve tool kit	*541589006100
		 Pliers	*606589003700
4	Mark intake valves (10) and exhaust valve (9) and remove upwards out of cylinder head
5	Clean valve guides (2) using cylinder brush (8)	 Cylinder brush	*000589106800
	Checking
6	Check whether intake valves (10) and exhaust valve (9) can continue to be used.	 The valve stems must have no surface damage. The grooves in valve locks (3) must not be worn and the chrome layer on valve stems must not be damaged.
		The valve seat must not be burnt; replace valve concerned if necessary.
	Exhaust valve spring, exhaust valve and exhaust valve seat ring modified		BT05.30-N-0004-01RH
7	Check inside diameter of valve guides (2) in cylinder head		*BE05.30-N-1003-02B
		 Drift	*102589002300
		 If it is possible to insert side of  drift (7) marked with "+" into valve guide (2): 
		Replace corresponding valve guide (2).	AR05.30-W-3731J
	Install
8	Insert intake valves (10) and exhaust valve (9) into cylinder head	 Coat valve stems with engine oil. If used valve are reinstalled observe the attached markings.
	Exhaust valve spring, exhaust valve and exhaust valve seat ring modified		BT05.30-N-0004-01RH
9	Insert valve springs (5) and new valve stem seals (1)		AR05.30-W-3510-02J
		 Magnetic pin	*210589004000
		 Valve tool kit	*541589006100
		 Pliers	*606589003700
10	Install cylinder head	Model 375, 950, 952, 953, 954, 958, 970, 972, 974, 975, 976	AR01.30-W-5800J
		Model 957	AR01.30-W-5800JB
11	Install nozzle holder combination		AR07.03-W-6831J