244619 Removing and installing DFI intake-air distributor
WM 244619 Removing and installing DFI intake-air distributor
Technical values
Preliminary work
1. Remove both oil mist separators. => 105519 Removing and installing oil mist separator on 4.8 l DFI engines - section on "Removing"
2. Loosen intake manifold on throttle housing. For details, see => 243519 Removing and installing air box for throttle housing on DFI engines (intake pipes upstream of throttle valve) - section on "Removing"
Information
Component overview
Intake module M48/01
Actuator for variable intake manifold
Intake air module, M48/51
Removing intake-air distributor
V8 naturally aspirated engine M48/01:
1. Loosen connections on the intake-air distributor.
Front connections on intake-air distributor on V8 naturally aspirated engine
1.1. Disconnect cable plug for heat socket. -1-
1.2. Disconnect positive crankcase ventilation connection on heat socket. -2-
1.3. Disconnect cable plug for throttle housing and remove it from the sheetmetal clip. -3-
1.4. Disconnect cable connection for tank vent line on the intake-air distributor. -4-
2. Unclip rear tank vent line at the wire harness. -arrow-
Tank vent line
3. Loosen screws on intake-air distributor. Illustration shows tightening sequence => Tightening sequence for intake-air distributor (shown on naturally aspirated engine) applies to both naturally aspirated and turbo engines. Carefully bend line for tank ventilation out of the way in order to access the screws.
Tightening sequence for intake-air distributor (shown on naturally aspirated engine) applies to both naturally aspirated and turbo engines
4. Carefully lift the rear intake-air distributor at the shift gate and pull off the vacuum line under the control valve -1- (difficult to reach, use a mirror). Pull off cable plug for control valve. -2-
Control valve
5. Lift off intake-air distributor.V8 turbo engine M48/51:
6. Loosen connections on intake-air distributor on the turbo engine in the same way as on the naturally aspirated engine. -1, 2, 3 and 4-
Connections on turbo intake module
7. Unclip rear tank vent line at the wire harness. -arrow-
Tank vent line
8. Loosen screws on intake-air distributor. Illustration shows tightening sequence => Tightening sequence for intake-air distributor (shown on naturally aspirated engine) applies to both naturally aspirated and turbo engines. Carefully bend line for tank ventilation out of the way in order to access the screws.
Tightening sequence for intake-air distributor (shown on naturally aspirated engine) applies to both naturally aspirated and turbo engines
9. Pull off vacuum line. -Vacuum line-
Vacuum line
10. Lift off intake-air distributor.
Installing intake-air distributor
V8 naturally aspirated engine M48/01:
1. Replace intake-air distributor gaskets.
2. Move intake-air distributor into installation position. Make sure that the gaskets do not slip out of place and that the lines are not trapped.
3. Carefully lift the rear intake-air distributor at the shift gate and connect the vacuum line under the control valve -1- (difficult to reach, use a mirror). Connect cable plug for control valve. -2-
Control valve
Information
If screws are damaged, take the intake-air distributor off again and carefully tap out the affected screws with a plastic hammer. Carefully tap in new screw elements with a plastic hammer.
4. Carefully screw in screws on intake-air distributor. Screws must all fit easily. Illustration shows tightening sequence => Tightening sequence for intake-air distributor (shown on naturally aspirated engine) applies to both naturally aspirated and turbo engines. Carefully bend line for tank ventilation out of the way in order to access the screws. Align intake-air distributor with screws tightened slightly and then tighten screws according to the tightening sequence. => Tightening torque: 15 Nm (11 ftlb.)
Tightening sequence for intake-air distributor (shown on naturally aspirated engine) applies to both naturally aspirated and turbo engines
5. Clip in rear tank vent line at the wire harness. -arrow-
Tank vent line
6. Fit connections on the intake-air distributor.
Front connections on intake-air distributor on V8 naturally aspirated engine
6.1. Connect cable plug for heat socket. -1-
6.2. Connect positive crankcase ventilation connection on heat socket. -2-
6.3. Connect cable plug for throttle housing and secure in sheetmetal clip. -3-
6.4. Connect cable connection for tank vent line on the intake-air distributor connection piece. -4- V8 turbo engine M48/51:
7. Replace intake-air distributor gaskets.
8. Move intake-air distributor into installation position. Make sure that the gaskets do not slip out of place and that the lines are not trapped.
9. Fit vacuum line. -vacuum line-
Vacuum line
Information
If screws are damaged, take the intake-air distributor off again and carefully tap out the affected screws with a plastic hammer. Carefully tap in new screw elements with a plastic hammer.
10. Carefully screw in screws on intake-air distributor. Screws must all fit easily. Illustration shows tightening sequence => Tightening sequence for intake-air distributor (shown on naturally aspirated engine) applies to both naturally aspirated and turbo engines. Carefully bend line for tank ventilation out of the way in order to access the screws. Align intake-air distributor with screws tightened slightly and then tighten screws according to the tightening sequence. => Tightening torque: 15 Nm (11 ftlb.)
Tightening sequence for intake-air distributor (shown on naturally aspirated engine) applies to both naturally aspirated and turbo engines
11. Clip in rear tank vent line at the wire harness. -arrow-
Tank vent line
12. Fit connections on intake-air distributor on the turbo engine in the same way as on the naturally aspirated engine. -1, 2, 3 and 4-
Connections on turbo intake module
Subsequent work
1. Secure intake manifold on throttle housing. For details, see => 243519 Removing and installing air box for throttle housing on DFI engines (intake pipes upstream of throttle valve) - section on "Installing"
2. Fit the two oil mist separators. => 105519 Removing and installing oil mist separator on 4.8 l DFI engines - section on "Installing"