Remove/install valve springs

AR05.30-P-3021MRT

Remove/install valve springs

25.05.2018

Engine

256.9 in model 222

Example illustration

01

Assembly device

04

Depressor

1

Cylinder head

02

Counterholder

05

Sliding piece

03

Assembly lever

06

Lever

Example illustration

03

Assembly lever

2

Upper valve spring retainer

6

Valve

04

Depressor

3

Valve spring

7

Lower valve spring retainer

1

Cylinder head

4

Valve keeper

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

 Caution

Risk of injury to skin and eyes due to handling of engine oil. Risk of poisoning caused by swallowing engine oil

Wear protective gloves, protective clothing and safety glasses.
Do not fill engine oil into beverage containers.

AS18.00-Z-0001-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

 

Remove/install

1

Remove cylinder head (1).

AR01.30-P-5800MRT

2

Remove hydraulic valve play compensation elements.

AR05.00-P-2013MRT

3

Attach cylinder head (1) to assembly device (01).


Before commissioning, ensure that the counterholders (02) for the  assembly device (01) are seated correctly on the cylinder head (1).
The cylinder head (1) will otherwise be damaged.

 Observe operator's manual provided by the manufacturer of the  assembly device (01).

 Assembly tool

*271589005900

4

Attach assembly lever (03) with depressor (04) to sliding piece (05), place depressor (04) on top valve spring retainer (2) vertically, and align sliding piece (05).

 Valve assembly tools kit

*111589256100

 Depressor

*273589006100

 Assembly tool

*271589005900

5

Move air suspension bellows of the assembly device (01) with a lever (06) until they stand centrally over the combustion chamber of the respective valves (6).


Ensure that the air suspension bellows of the  assembly device (01) press centrally into the combustion chamber.
The valves (6) will otherwise be damaged.

 Observe operator's manual provided by the manufacturer of the  assembly device (01).

 Assembly tool

*271589005900

6

Connect compressed air to assembly device (01) and open compressed air valve.

 Observe operator's manual provided by the manufacturer of the  assembly device (01).

 Assembly tool

*271589005900

7

Press valve spring (3) together with the assembly lever (03) and remove valve keepers (4) with magnetic pin.

 Installation: Ensure valve keepers (4) are seated correctly.

 Valve assembly tools kit

*111589256100

 Magnetic pin

*210589004000

8

Loosen assembly lever (03) and relieve valve spring (3).

 Valve assembly tools kit

*111589256100

9

Remove top valve spring retainer (2) and valve spring (3).



Check

10

Check valve spring (3) for damage.

If damage is present,



Replace all valve springs (3).

11

Check top valve spring retainer (2) and bottom valve spring retainer (7) for score marks, cracks, and pitting.

If damage is present,



Replace top and bottom valve spring retainer (2, 7).

12

Check valve stems for formation of burrs and pitting.

If ridging is available,



Deburr valve stems.

If pitting is present,



Install new valves (6).

AR05.30-P-3511MRT

13

Install in the reverse order.