Removing and Installing Hydraulic Tappets

Removing and installing hydraulic tappets on DFI engines

Preliminary work

1. Remove the camshafts.

Information

Component overview

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.





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 - Bucket 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 - Bucket 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

Removing hydraulic tappets

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!

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





Setting components aside without mixing them up (cylinder bank 5-6 shown here as an example)

E - Intake side

A - Outlet side

5 to 8 - Cylinders

Installing hydraulic tappets

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





Hydraulic tappets

Subsequent work

1. Install the camshafts.