Removing and Installing Camshafts
WM 150520 Removing and installing camshafts on 4.8-liter DFI engines
Preliminary work
Preliminary work
1. Remove camshaft controller.
2. Remove camshaft timing gears.
3. The high-pressure pump must be removed first before the intake camshaft for cylinder bank 5 to 8 can be removed. The drive coupling of the high-pressure pump prevents the camshaft from being removed.
Removing camshafts
Removing camshafts
Information:
During removal, note the installation position and allocation of the camshafts and bearing covers on a sheet of paper in such a way that they cannot be mixed up.
Protect camshafts and bearing covers from dirt and place the components on a clean surface according to installation position.
1. Slowly and uniformly loosen and then unscrew all M6 screws (according to cylinder bank) -1 and 6- -3 and 5- on the camshaft bearing covers -2, 4 and 5- -2-, -4 and 6-.
The bearing covers are marked E for intake camshaft and A for outlet camshaft. The bearing covers are numbered consecutively by cylinder.
The bearing covers are seated very securely in the cylinder head because of a dowel sleeve -3- -1-. Jiggle free using a pliers if necessary. Place on a marked, clean surface.
Camshaft mount, cylinder bank 1 to 4
Camshaft mount, cylinder bank 5 to 8
Information:
The intake camshaft for cylinder bank 5 to 8 has a plastic loss preventer to prevent the high-pressure pump's drive coupling from falling off
If for some reason the plastic loss preventer was not installed, the drive coupling would fall off when the camshaft is removed. The high-pressure pump and its drive mechanism will still work even without the plastic loss preventer.
2. Remove camshafts (according to cylinder bank) -1 and 2- -3 and 6- and place on a marked, clean surface. Turn the intake camshaft for cylinder bank 1 to 4 so that it can be lifted up and out of the drive coupling for the vacuum pump.
Camshafts, cylinder bank 1 to 4
Camshafts, cylinder bank 5 to 8
Installing camshafts
Installing camshafts
Information:
A data matrix coding is shown on the staking dihedron of the camshafts. This is a square black/white dotted marking used for electronic identification purposes during the production process. This marking can be used as an aid when inserting the camshafts into the cylinder head. All four camshafts press against the valves the least when the data matrix coding is facing upwards during installation.
1. Insert camshafts so that the minimum amount of pressure is exerted on the valve springs and lubricate bearing locations with normal multipurpose grease or engine oil.
Camshaft position for cylinders 1 to 4
Camshaft position for cylinders 5 to 8 (high-pressure pump shown fitted)
Camshaft identification on V8 turbo engine
A - Cylinders 1 to 4
B - Cylinders 5 to 8
1 - Outlet camshaft identification (green)
2 - Intake camshaft identification (blue)
3 - Intake camshaft identification (blue)
4 - Outlet camshaft identification (green)
Camshaft identification on V8 naturally aspirated engine
A - Cylinders 1 to 4
B - Cylinders 5 to 8
1 - Outlet camshaft identification (green)
2 - Intake camshaft identification (white)
3 - Intake camshaft identification (white)
4 - Outlet camshaft identification (green)
2. Position bearing covers correctly and screw down. The bearing covers are numbered and marked with E (intake) or A (outlet). Fit camshaft bearing covers evenly and gradually, and slowly tighten to the specified tightening torque. The camshafts must not be strained or tilted. Outlet camshafts and intake camshafts (also bank-specific) cannot be used interchangeably because of the bearing locations and length.
Camshaft bearing cover identification
- All markings can be read from the exhaust side/main diagram applies symmetrically for both cylinder heads
1 - Matching number for cylinder head/intake camshaft bearing cover, cylinder 1 (E1)
2 - Matching number for cylinder head/intake camshaft bearing cover, cylinder 2 (E2)
3 - Matching number for cylinder head/intake camshaft bearing cover, cylinder 3 (E3)
4 - Matching number for cylinder head/intake camshaft bearing cover, cylinder 4 (E4)
5 - Matching number for cylinder head/outlet camshaft bearing cover, cylinder 1 (A1)
6 - Matching number for cylinder head/outlet camshaft bearing cover, cylinder 2 (A2)
7 - Matching number for cylinder head/outlet camshaft bearing cover, cylinder 3 (A3)
8 - Matching number for cylinder head/outlet camshaft bearing cover, cylinder 4 (A4)
Pfeil - Direction of travel
Camshaft mount, cylinder bank 1 to 4
1 - Screw, M6 x 35 - Tightening torque: 13 Nm (9.5 ftlb.)
2 - Bearing cover
3 - Dowel sleeve
4 - Bearing cover (intake)
5 - Bearing cover (outlet)
6 - Screw, M6 x 70 - Tightening torque: 13 Nm (9.5 ftlb.)
7 - Bearing surfaces (oil with engine oil)
A - Direction of travel
Camshaft mount, cylinder bank 5 to 8
1 - Dowel sleeves
2 - Bearing cover (intake)
3 - Screw, M6 x 70 - Tightening torque: 13 Nm (9.5 ftlb.)
4 - Bearing cover
5 - Screw, M6 x 35 - Tightening torque: 13 Nm (9.5 ftlb.)
6 - Bearing cover (outlet)
7 - Bearing surfaces (oil with engine oil)
A - Direction of travel
Subsequent work
Subsequent work
Complete Steps 1 and 2 together. Set the timing before completing the final tightening of the camshaft controllers and sprockets.
1. Install camshaft controllers for timing adjustment.
2. Install camshaft timing gears for timing adjustment.
3. The high-pressure pump must be fitted after installing the intake camshaft for cylinder bank 5 to 8.
4. Install valve cover.