Check/face-grind cylinder head contact surfaces

AR01.30-B-7162TC

Check/face-grind cylinder head contact surfaces

12.02.16



Remove

1

Remove the head (1)

AR01.30-B-5800TC

2

Disassemble the injector supports set

AR07.03-B-6831TD

3

Clean the head (1)

 Only scrap when cleaning the cylinder head sealing surface.



Test

4

Measure the head's height (H) with the feeler gauge

 If the admissible height of the head (H) is not reached:



*BE01.30-B-1001-02C

Install a new head (1) hardened by induction.

5

Measure the valves (B) at the two intake (2) and exhaust (3) valves

AR05.30-B-4100-01TD

*BE05.30-B-1001-01D



*001589532100



*541589004000

 If the test value measurement reading before and after machined flat is not within the admissible tolerance:



Install a new head (1) hardened by induction.

6

check the flatness of the cylinder head face (combustion chamber's side)

*BE01.30-B-1002-02C

For the precision ruler, please see GOTIS

http://gotis.aftersales.mercedes-benz.com

Rectify

7

Remove the intake (2) and exhaust (3) valves

 If the intake (2) and the exhaust (3) valves are to be reused, identify the installation place at the intake (2) valves and in the exhaust (3) valves.

AR05.30-B-3511TC

8

Remove the Top Brake (4) valve (4)

AR01.50-B-1000TC

9

Machine the cylinder head face (combustion chamber side) by flat machining

 After the removal of the material, the height of the cylinder head (H) must not be lower than the admissible measure.

*BE01.30-B-1001-02C

The quality of the cylinder head's surface finishing quality must be maintained.

*BE01.30-B-1003-02C

10

Clean the head (1)

 Impurities must not go into the holes that serve for engine oil, coolant, cylinder head tappets stems, in order to avoid damaging the engine.



Install:

11

Install the intake (2) and exhaust (3) valves

 Pay attention to the identification of the intake (2) and exhaust (3) valves.

AR05.30-B-3511TC

12

Measure the back-set of the valves (B) at the two intake (2) and exhaust (3) valves

 If the measured value is not within the tolerance values:



AR05.30-B-4100-01TD

Install a new head (1) hardened by induction.

*BE05.30-B-1001-01D



*001589532100



*541589004000

13

Assemble the Top Brake (4)

AR01.50-B-1000TC

14

Assemble the injector supports set

AR07.03-B-6831TD

15

Install the head (1)

AR01.30-B-5800TC

Número

Denominação

Engine 457.9

BE01.30-B-1001-02C

Height of cylinder head

standard

mm

113.85...114.15

minimum after machining

mm

113.5

BE01.30-B-1002-02C

Maximum permissible flatness deviation of cylinder head mating surface

on overall length

mm

-

over a length of 150mm

mm

0.015

BE01.30-B-1003-02C

Roughness on cylinder head mating surface

Rz

mm

-

R3z

mm

0.008...0.016

Número

Denominação

Engine 457.9; 460.984

BE05.30-B-1001-01D

Distance between the valves faces and the head

Intake

Normal

mm

0.7...1.1

Maximum repair

mm

1.6

Exhaust

Normal

mm

0.7...1.1

Maximum repair

mm

1.6