Check/face-grind cylinder head contact surfaces

AR01.30-B-7162D

Check/face-grind cylinder head contact surfaces

12.02.16



Disassemble

1

Remove the cylinder head.

Engine 376.922/926/927

AR01.30-B-5800C

Engine 376.919

AR01.30-B-5800I

2

Remove the spark plugs.

Engine 376.922/926/927

AR15.12-B-1010A

Engine 376.919

AR15.12-B-1010C

3

Remove the valves (1) and (2).

AR05.30-B-3511D



Check

4

Check the cylinder head mating surface for unevenness.

Maximum permissible unevenness on the cylinder head mating surface.

*BE01.30-B-1003-02A

*BE01.30-B-1004-02A

5

Check the parallelism between cylinder head top and bottom faces.

Maximum permissible parallelism deviation between the cylinder head top and bottom faces.

*BE01.30-B-1005-02A

6

Check cylinder head height (A).

 Replace the cylinder head, if the height (A) is below the minimum permissible.

*BE01.30-B-1001-02A

Reworking

7

Machine the cylinder head mating surface.

 Only machine the cylinder head mating surface if a longitudinal or transversal discrepancy is identified, also in the case of porous and deteriorated spots where maintenance of roughness is indispensable.

*BE01.30-B-1003-02A

*BE01.30-B-1004-02A

*BE01.30-B-1006-02A

 The cylinder head height (A) cannot be below the minimum permissible value.

*BE01.30-B-1001-02A

The parallelism deviation between the cylinder head top and bottom faces cannot exceed the maximum permissible value.

*BE01.30-B-1005-02A

Data for machining:

Speed;        n = 1400/min (rpm)

Longitudinal feed;                    920 mm/min

Vertical feed (each passage);          0.03mm

Cutting speed;          Vs = 27 m/s

Type of wheel;      Tyrolit 50C 36F 5V 15, Norton 39C 36 F8 VK

 cutting speed (Vs) was obtained with a wheel of diameter (d) = 370 mm.Should it be necessary to vary the wheel diameter in function of the grinding machine, it becomes necessary to also modify the machine speed (n).In this case utilize the following formula:

n = (Vs . 1000 . 60) : (d . 3,1416)

e.g.:n = 27 . 1000 . 60 :370 . 3,1416 = 1393

A cutting speed (Vs) tolerance of up to 10% is permissible.



Measure

8

Put the intake and exhaust valves in the cylinder head and measure the valve recess (G).

 Fit the intake and exhaust valves in their respective seats.

AR05.30-B-4100-01C

Intake valve recess (G).

*BE05.30-B-1011-01A

Exhaust valve recess (G).

*BE05.30-B-1012-01A



*001589532100



*343589004000

 If the valve recess (G) is not obtained, rework the seats.

AR05.30-B-4511D



Assembling

9

Install the valves (1) and (2) in the cylinder head.

AR05.30-B-3511D

10

Install the spark plugs.

Engine 376.922/926/927

AR15.12-B-1010A

Engine 376.919

AR15.12-B-1010C

11

Installing cylinder heads.

Engine 376.922/926/927

AR01.30-B-5800C

Engine 376.919

AR01.30-B-5800I

Número

Denominação

Gas engines 376.9

BE01.30-B-1001-02A

Head height (A)

Standard

mm

91,9...92,1

minimum after machining

90,9

BE01.30-B-1003-02A

Longitudinal flatness divergence at the lower face of the head

Maximum admissible limit for reutilization

mm

0,15

Maximum admissible for the new or machined head

mm

0,05

BE01.30-B-1004-02A

Transverse flatness divergence at the lower face of the head

Maximum admissible limit for reutilization

mm

0,03

Maximum admissible for the new or machined head

mm

0,015

BE01.30-B-1005-02A

Maximum admissible alignment deviation between the upper and lower faces of the head

mm

0,10

BE01.30-B-1006-02A

Maximum roughness at the lower face of the head (Rz)

mm

0,016

Número

Denominação

Engine 376.922/923/924

Engine 376.925/926/927

BE05.30-B-1011-01A

Distance (G) of the intake valve

Normal

mm

0.7...1.1

0.7...1.1

Maximum repair

mm

1.3

1.3

BE05.30-B-1012-01A

Distance (G) of the exhaust valve

Normal

mm

0.7...1.1

0.7...1.1

Maximum repair

mm

1.6

1.6