Remove/install valve springs and / or valve stem seals

AR05.30-P-3500RT

Remove/install valve springs and / or valve stem seals

13.1.06

 

Remove/install

 Danger!

Risk of injury caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.

When moving components, ensure that no body parts or limbs are within the operating range of moving parts.

AS00.00-Z-0011-01A

1

Open engine hood and raise to vertical position

AR88.40-P-1000RT

2

Remove partition wall between wheelhouses

AR62.30-P-2400RT

3

Remove air filter housing

AR09.10-P-1150RT

4

Remove electric fan

AR20.40-P-5000RT

5

Remove poly-V-belt

 Installation: Lock clamping device with 5 mm dia. drift or pin.

AR13.22-P-1202RT

6

Remove cylinder head covers

AR01.20-P-5014RT

7

Remove a spark plug from each cylinder

 See: 



Replace spark plugs

AP15.10-P-1580RT

8

Set crankshaft to a 40° crank angle after ignition TDC and interlock camshaft with the locating plates

 The engine must not be turned back; otherwise the timing chain could skip.

 Rotate engine at the center bolt on the crankshaft in the direction of rotation of the engine until the marking 40° on the belt pulley/vibration damper and marking on the timing case cover match.

The grooves on the camshafts must be pointing toward the inner V.

 Locating plate on the right

*112589003200

 Locating plate on the left

*112589013200

9

Remove chain tensioner

AR05.10-P-7800RT

10

Remove camshaft Hall sensor

AR15.10-P-2000RT

11

Remove camshaft sprockets

 Installation: Check engine valve timing.

AR05.10-P-6858RT

 If necessary after testing:

Set the basic position of camshafts

AR05.20-P-6020RT



*BA05.20-P-1001-01B

 Open-end wrench

*112589000100

 Insertion tool

*112589010300

 Torque wrench

*001589722100

12

Remove the camshaft bearing bridges

AR05.20-P-7103RT

13

Position piston of cylinder to be processed to TDC

 Rotate engine at crankshaft center bolt by holding timing chain up for this step so that it does not jam.

 Installation: Before installing the camshaft sprockets, again turn back crankshaft in the starting position of a 40° crank angle after ignition TDC on

cylinder 1.

14

Secure vehicle to prevent it from moving.

 Attach park pawl. If necessary install retaining lock for crankshaft:

Install retaining lock for crankshaft/starter ring gear

AR03.30-P-5000RT

15

Connect cylinder leak tester

AR01.00-P-1300RT

16

Pressurize compression chamber to about 5 bar

17

Screw in assembly lever (02) with counterholder (01) in cylinder head

 Valve assembly tools case

*111589256100

18

Attach and align assembly lever (02) and thrust piece (03) in the counterholder

 Attach the thrust piece vertically to the upper valve plate (8) and align with the assembly tool.

 Valve assembly tools case

*111589256100

19

Remove upper valve disk (8) and valve spring (9)

 Do not allow valves to touch the piston crowns otherwise they will be damaged.

 Compress valve spring and remove split valve spring retainer locks (10) with tweezers or magnetic rod. The valve springs of the inlet and exhaust valves are identical.

 Magnetic finger

*116589066300

 Tweezers

*WH58.30-Z-1040-02A

20

Remove bottom valve disc (11)

21

Replace valve stem seal (12)

 Pull valve stem seal out of valve stem using pliers.

AR05.30-P-3500-02A

 Installation: Before fitting the new valve stem seal with the drift, a protective sleeve must be fitted to the valve stem to protect the valve stem seal from damage.

 Pliers

*606589003700

 Drift

*119589004300



Checking

22

Inspect surface of valve stem for roughness and ridging

 Visual inspection or with nail. Replace valves with a rough stem surface or formation of ridging: 

Replace valves.

AR05.30-P-3511RT

23

Check upper valve disk (8) and lower valve disk (11)

 Check valve disk for pitting; replace if necessary.

24

Install in the reverse order

Number

Designation

Engines
113.940/941/
942/943/944/
948/961/962/
963/964/965/
966/967/968/
969/971/980/
981/982/984/
986/992/995

BA05.20-P-1001-01B

Bolt for camshaft sprocket

M1245

Stage 1

Nm

50

Stage 2

°

90

Number

Designation

WH58.30-Z-1040-02A

Tweezers, straight 160 mm with rounded tips