Check/face-grind cylinder head contact surfaces

AR01.30-W-7162A

Check/face-grind cylinder head contact surfaces

09.01.2014

ENGINE

904.9 in MODEL 375, 673, 674, 676, 970, 972, 975, 976

ENGINE

904.904 in MODEL 670

ENGINE

904.908/914/923/936 in MODEL 668, 670

ENGINE

906.9 in MODEL 374, 375, 950, 952, 953, 954

ENGINE

906.9 in MODEL 957

without CODE MS8 (Natural gas engine)

ENGINE

906.9 in MODEL 970, 972, 974, 975, 976

1

Intake valves

2

Exhaust valve

3

Constant throttle valve

4

Mount dial indicator

5

Dial indicator holder

6

Guide pins

A

Protrusion of guide pin from cylinder head

B

Valve setback

C

Difference between both inlet valve stem ends

H

Height of cylinder head



Remove

1

Remove cylinder head

MODELS 374, 375, 673, 674, 675, 950, 952, 953, 954, 957, 970, 972,974, 975, 976

AR01.30-W-5800A

Model 668, 670

AR01.30-D-5800D

2

Remove nozzle holder combinations

Engine 904.9 up to engine end no. 040487

AR07.03-W-6831A

Engine 904.9 as of engine end no. 040488, engine 906.9

AR07.03-W-6831C

3

Remove intake valves (1) and exhaust valve (2)

ENGINE 904.9 in MODEL 375, 673, 674, 676, 970, 972, 975, 976
ENGINE 904.904 in MODEL 670
ENGINE 904.908/914/923/936 in MODEL 668, 670
ENGINE 906.9 in MODEL 374, 375, 950, 952, 953, 954
ENGINE 906.9 in MODEL 957
without CODE MS8 (Natural gas engine)
ENGINE 906.9 in MODEL 970, 972, 974, 975, 976

AR05.30-W-3511A

4

Remove constant throttle valve (3)

ENGINE 904.9 in MODEL 375, 673, 674, 676, 970, 972, 975, 976
ENGINE 904.904 in MODEL 670
ENGINE 904.908/914/923/936 in MODEL 668, 670
ENGINE 906.9 in MODEL 374, 375, 950, 952, 953, 954
ENGINE 906.9 in MODEL 957
without CODE MS8 (Natural gas engine)
ENGINE 906.9 in MODEL 970, 972, 974, 975, 976

AR01.50-W-1000A

 Only on engine brake with constant throttle.



Check

5

Measure height (H) of cylinder head

 Replace cylinder head if necessary.

Height of cylinder head

*BE01.30-N-1001-02B

6

Check permissible variation of flatness of lower contact surface

Permissible variation in flatness of lower separating surface in a longitudinal direction

*BE01.30-N-1002-02B

Face-grinding

7

Machine cylinder head separating surface (on side of combustion chamber) until flat


For processing the required surface quality of the cylinder head contact surface must be achieved and the height of the cylinder head (H) must be reached after stock removal.
Leaks or damage can occur to the mechanical components otherwise.

 Only machine the cylinder head separating surface flat if there are porous or damaged locations present and the height of the cylinder head (H) is adequate.

Peak-to-valley height (Rz) of cylinder head contact surface

*BE01.30-N-1003-02B

Permissible variation in flatness of lower separating surface in a longitudinal direction

*BE01.30-N-1002-02B

Height of cylinder head

*BE01.30-N-1001-02B

8

Clean cylinder head



Measure

9

Insert intake valves (1) and exhaust valve (2) into cylinder head

10

Measure valve setback (B) to cylinder head, and permissible difference between intake valves (1) and note

ENGINE 904.9 in MODEL 375, 673, 674, 676, 970, 972, 975, 976
ENGINE 904.904 in MODEL 670
ENGINE 904.908/914/923/936 in MODEL 668, 670
ENGINE 906.9 in MODEL 374, 375, 950, 952, 953, 954
ENGINE 906.9 in MODEL 957
without CODE MS8 (Natural gas engine)
ENGINE 906.9 in MODEL 970, 972, 974, 975, 976

AR05.30-W-4100-01C

 Replace cylinder head if necessary.

Permissible difference of intake valves measured between cylinder head and valve stem end

*BE05.30-N-1014-01B

Valve setback relative to cylinder head contact surface

*BE05.30-N-1001-01B

 Dial gage

*001589532100

 Dial indicator holder

*363589022100

 Dial indicator holder

*343589004000

11

Measure protrusion of guide pin starting at cylinder head (A)

 Replace guide pins (6) if necessary.

Valve bridge guide pin projection from cylinder head (A)

*BE05.30-N-1003-04B



Install

12

Install constant throttle valve (3)

ENGINE 904.9 in MODEL 375, 673, 674, 676, 970, 972, 975, 976
ENGINE 904.904 in MODEL 670
ENGINE 904.908/914/923/936 in MODEL 668, 670
ENGINE 906.9 in MODEL 374, 375, 950, 952, 953, 954
ENGINE 906.9 in MODEL 957
without CODE MS8 (Natural gas engine)
ENGINE 906.9 in MODEL 970, 972, 974, 975, 976

AR01.50-W-1000A

 Only on engine brake with constant throttle.

13

Install intake valves (1) and the exhaust valve (2)

ENGINE 904.9 in MODEL 375, 673, 674, 676, 970, 972, 975, 976
ENGINE 904.904 in MODEL 670
ENGINE 904.908/914/923/936 in MODEL 668, 670
ENGINE 906.9 in MODEL 374, 375, 950, 952, 953, 954
ENGINE 906.9 in MODEL 957
without CODE MS8 (Natural gas engine)
ENGINE 906.9 in MODEL 970, 972, 974, 975, 976

AR05.30-W-3511A

14

Install nozzle holder combinations

Engine 904.9 up to engine end no. 040487

AR07.03-W-6831A

Engine 904.9 as of engine end no. 040488, engine 906.9

AR07.03-W-6831C

15

Install cylinder head

MODELS 374, 375, 673, 674, 675, 950, 952, 953, 954, 957, 970, 972,974, 975, 976

AR01.30-W-5800A

Model 668, 670

AR01.30-D-5800D

Check values for cylinder head

Number

Designation

ENGINE 900.9, 904.9

ENGINE 902.9, 906.9

BE01.30-N-1001-02B

Height of cylinder head

New

mm

107,9...108,1

107,9...108,1

after stock removal

mm

106,9

106,9

Check values for cylinder head

Number

Designation

ENGINE 900.9, 904.9

ENGINE 902.9, 906.9

BE01.30-N-1002-02B

Permissible variation in flatness of lower separating surface in a longitudinal direction

over the entire length

mm

0,05

0,07

Over a length of 150 mm

mm

0,02

0,02

Check values for cylinder head

Number

Designation

ENGINE 900.9, 904.9

ENGINE 902.9, 906.9

BE01.30-N-1003-02B

Peak-to-valley height (Rz) of cylinder head contact surface

μm

8...16

8...16

Check values for valves

Number

Designation

ENGINE 902.9, 906.9 with CODE MS8

ENGINE 904.9## ## up to 039739, ENGINE 906.9## ## up to 041955 except CODE MS8

BE05.30-N-1001-01B

Valve setback relative to cylinder head contact surface

Inlet

mm

1,1...1,5

1,1...1,5

Outlet

mm

1,3...1,7

1,1...1,5

Check values for valves

Number

Designation

ENGINE 904.9## ## as of 039740, ENGINE 906.9## ## as of 041956 except CODE MS8

BE05.30-N-1001-01B

Valve setback relative to cylinder head contact surface

Inlet

mm

1,1...1,5

Outlet

mm

1,1...1,5

Check values for valve timing

Number

Designation

ENGINE 900.9, 902.9, 904.9, 906.9

BE05.30-N-1003-04B

Valve bridge guide pin projection from cylinder head (A)

mm

25,1...25,5

Check values for valves

Number

Designation

ENGINE 902.9, 906.9 with CODE MS8

ENGINE 904.9## ## up to 039739, ENGINE 906.9## ## up to 041955 except CODE MS8

BE05.30-N-1014-01B

Permissible difference of intake valves measured between cylinder head and valve stem end

mm

0,3

0,3

Check values for valves

Number

Designation

ENGINE 904.9## ## as of 039740, ENGINE 906.9## ## as of 041956 except CODE MS8

BE05.30-N-1014-01B

Permissible difference of intake valves measured between cylinder head and valve stem end

mm

0,3