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Intake manifold > < Removing and installing camshaft

Astra H

Check and adjust valve play

  Remove

1.   Open bonnet
2.   Raise vehicle by its full height
3.   Detach the lower engine cover and right engine splash guard
4.   Lower vehicle by its full height
5.   Detach engine cover
6.   Detach vacuum line
•   Detach 2x vacuum hose from vacuum line
•   Unscrew 2x bolts (arrows)
Object Number: 2408150 Size: DEFAULT


7.   Detach 2x hose (1) from cylinder housing cover
•   Undo 2 clamps
Object Number: 2408151 Size: DEFAULT


8.   Remove cylinder head cover
•   Unscrew 7x bolt (arrows) in a spiral from the outside inward
Object Number: 2408152 Size: DEFAULT


  Adjust

9.   Turn the crankshaft until the cam pair (1) faces up.
Object Number: 7360859 Size: DEFAULT


10.   Check valve play
•   With feeler gauge
Note:   Valve play must be checked at room temperature when the engine is cold.
– Desired values: Intake valve 0.3 ± 0.05 mm / exhaust valve 0.35 ± 0.05 mm
11.   Adjust valve play
•   Turn the bucket tappet until the tappet groove faces outwards
Important:   Make sure that the valves are not adjusted when the piston is at TDC. Otherwise, the valves could strike the piston head.
•   Press down bucket tappet with EN-46797 (1)
•   Insert EN-46799 (2)
•   Remove shim
Object Number: 7360858 Size: DEFAULT


12.   Example for determination of shim thickness:

1.

Thickness of installed shim

  

3.15 mm

2.

Measurement between cams and cup tappets

+

0.45 mm
   

=

3.60 mm

3.

Nominal valve play

-

0.35 mm

4.

Thickness of new shim

=

3.25 mm
13.   Insert shim (1)
•   Coat new shim with engine oil and insert in bucket tappet with code facing down
•   Remove EN-46799
Object Number: 8231078 Size: DEFAULT


14.   Turn crankshaft
•   Turn in direction of engine rotation until cam pair (2) faces up
– Check and adjust
•   Turn in direction of engine rotation until cam pair (3) faces up
– Check and adjust
•   Turn in direction of engine rotation until cam pair (4) faces up
– Check and adjust
Note:   Valve play must be checked again on all adjusted valves
Object Number: 7360859 Size: DEFAULT


  Remove

15.   Clean sealing surface
16.   Install cylinder head cover
•   Replace seal
•   Tighten 7x bolt in a spiral from the inside outward 10 Nm
17.   Attach 2x hose to cylinder head cover
•   Attach 2x clamps
18.   Install vacuum line
•   Tighten 2x bolt 9 Nm
•   Attach 2x vacuum hose to vacuum line
19.   Attach engine cover
20.   Raise vehicle by its full height
21.   Install lower engine cover and right engine splash guard
22.   Lower vehicle by its full height
23.   Close bonnet

Intake manifold > < Removing and installing camshaft