Check/face-grind cylinder head contact surfaces

AR01.30-B-7162B

Check/face-grind cylinder head contact surfaces

12.02.16



Disassemble

1

Remove cylinder head.

AR01.30-B-5800A

2

Remove the injection nozzle holders

AR07.03-B-6831C

3

Remove the valves (1) and (2)

AR05.30-B-3511C



Check

4

Check cylinder head lower face planarity

Maximum permissible deviation of flatness on cylinder head bottom face

*BE01.30-B-1003-02A

*BE01.30-B-1004-02A

5

Check parallelism of lower and upper cylinder head faces

Maximum permissible deviation of parallelism of lower and upper cylinder head faces

*BE01.30-B-1005-02A

6

Check cylinder head height (A)

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

*BE01.30-B-1001-02A

Reworking

7

Rework the cylinder head mating surface

 Machine the cylinder head mating surface only if a longitudinal or transversal discrepancy is detected, also in the case of porous and deteriorated spots where the maintenance of rugosity is indispensable.

*BE01.30-B-1003-02A

*BE01.30-B-1004-02A

*BE01.30-B-1006-02A

 The cylinder head height (A) is not to be below the minimum permissible value .

*BE01.30-B-1001-02A

 The parallel deviation of lower and upper cylinder head faces shall not 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 step)    0,03 mm

Grinding speed Vs = 27 m/s

Wheel specification Tyrolit 50C 36F 5V 15

       Norton 39C 36 F8 VK

 grinding speed (Vs) was obtained based on a segment wheel with a diameter (d) = 370 mm.    Being necessary to vary the diameter of the segment wheel in function of the grinding machine, it is necessary to adjust the revolutions (n) of the machine. In this case, utilize the following formula:

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

Ex.: n = 27 . 1000 . 60 : 370 . 3.1416 = 1393

A tolerance is permissible in the grinding speed (Vs) of up to 10%.



Measure

8

Place the intake and exhaust valves in the cylinder head and measure the distance (G) between the face of the valves and the cylinder head bottom face (valve recess)

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

AR05.30-B-4100-01C

Distance (G) of intake valve.

*BE05.30-B-1011-01A

*BE05.30-B-1011-01B

Distance (G) of exhaust valve.

*BE05.30-B-1012-01A

*BE05.30-B-1012-01B



*001589532100



*343589004000

 Should the valve distance (G) not be obtained, machine the valve seat inserts.

AR05.30-B-4511C



Assembling

9

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

AR05.30-B-3511C

10

Install the injection nozzle holders.

AR07.03-B-6831C

11

Install the cylinder head.

AR01.30-B-5800A

Número

Denominação

Engine 374.9

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

0,10

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 372.90/93, 374.90 (except 374.901000, 374.901406, 374.901407) , 376.90, 376.930

Engine 376.919

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

0.9...1.3

Maximum repair

mm

1.6

1.6

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

Número

Denominação

Engine 374.95 (except 374.953), 376.95, 376.96 (except 376.967), 376.98, 386.9

Engine 372.9 (except 372.906/907/930), 374.953, 374.97, 374.98, 374.99, 376.94, 376.967, 376.97, 376.99, 377.9

BE05.30-B-1011-01B

Distance (G) of the intake valve

mm

0.7...1.1

0.7...1.1

Maximum repair

mm

1.3

1.3

BE05.30-B-1012-01B

Distance (G) of the exhaust valve

mm

0.7...1.1

0.9...1.3

Maximum repair

mm

1.6

1.6