Removing and Installing Valve Lifters (Hydraulic Tappets)

Removing and installing valve lifters (hydraulic tappets)

Preliminary work

1. Remove camshafts.

Removing valve lifters (hydraulic tappets)

Information
* The hydraulic tappets are fitted as bucket tappets on the outlet side and as switching tappets for valve lift switchover on the intake side.
* Switching tappets and bucket tappets cannot be interchanged.
* The hydraulic tappets have a twist lock for the cylinder head.

Information
* If the hydraulic tappets are to be re-used, they must be marked according to installation position using a water-resistant felt-tip pen and set aside in such a way that they cannot be mixed up!
* If the hydraulic tappets are to be re-used, they must be installed at the same position!





Camshafts, cylinder bank 1 to 4

1 - Camshaft (outlet)
2 - Camshaft (intake)
3 - Hydraulic valve for variable valve lift control
4 - Screw, M5 x 12
5 - Switching tappet (oil with engine oil)
6 - Flat-base tappet (oil with engine oil)
7 - Stopper
8 - Mounting saddle 1 to 4
9 - Stopper
10 - Bearing locations (oil with engine oil)
A - Direction of travel





Camshafts, cylinders 5 to 8

1 - Switching tappet (oil with engine oil)
2 - Flat-base tappet (oil with engine oil)
3 - Camshaft (intake)
4 - Hydraulic valve for variable valve lift control
5 - Screw, M5 x 12
6 - Camshaft (outlet)
7 - Stopper
8 - Mounting saddle, cylinders 5 to 8
9 - Stopper
10 - Bearing surfaces (oil with engine oil)
A - Direction of travel

1. Pull the hydraulic tappets out of the cylinder head one after the other and set them aside in such a way that they cannot be mixed up.





Hydraulic tappets





Putting components down without mixing them up (cylinder bank 5-8 shown here as an example)

E - Intake side
A - Outlet side
5 to 8 - Cylinders

Installing valve lifters (hydraulic tappets)

1. Oil the hydraulic tappets with engine oil and insert them into the cylinder head.





Hydraulic tappets

Subsequent work

1. Install camshafts.