31 10 001 Removing and installing complete front axle with engine and transmission (E9x-N55)
Special tools required:
Check payload of vehicle, if necessary, drain.
Footwell at front is loaded with approx 200 kg.
Note safety information of TABLE LIFT !
Necessary preliminary work:
- Position the vehicle centrally.
- Clamp off BATTERY EARTH LEAD .
- SUCTION OFF the air conditioning.
- REMOVE LEFT CHARGE AIR DUCT .
- Remove CLEAN AIR PIPE .
- REMOVE FRONT WHEELS .
- Remove both brake calipers at the front and hang them to one side.
- Remove complete PROPELLER SHAFT .
- Remove FAN COWL with electric fan.
- Drain COOLANT .
- Detach all coolant hoses from engine.
- Remove LOWER SECTION OF MICROFILTER HOUSING .
- Detach vacuum line from brake booster.
- Detach engine wiring harness . See 12 51 100 REPLACING WIRING HARNESS SECTION FOR IGNITION AND INJECTORS (N55) or 12 51 001 REPLACING WIRING HARNESS SECTION FOR ENGINE (N55) in electronics box and set aside.
- Release transmission oil line at the heat exchanger.
Required preliminary work when exchanging the engine, transmission and front axle support (all-wheel drive vehicle) The following work must be performed before removing the front axle support with the table lift!
- Detach both OUTPUT SHAFTS on the inside of the axle drive.
Installation note:
When replacing the assembly, release converter bolting.
Crank engine at vibration damper in direction of rotation until screw (1) is visible in recess.
Release all bolts of torque converter with special tool 24 1 110 .
Tightening torque 24 40 1AZ .
Release screws (1) of A/C lines and disconnect.
Tightening torque 64 53 6AZ
Installation note:
Replace sealing rings.
To avoid damage to the sealing rings, use special tool 00 9 030 .
Unlock and remove pressure pipe on the right (1) on the charge air cooler.
Release screw.
Tightening torque 17 21 1AZ .
Detach engine oil pipe (1) from oil filter control housing.
Catch and dispose of emerging oil.
Open connector housing (1) in left and right wheel arches, pull line connections (2) out of bracket and disconnect.
Pull cable with rubber grommet out of brackets (3).
Recycling
Catch and dispose of escaping fuel with auxiliary materials.
Observe country-specific waste disposal regulations.
Release screws (1) and remove protective plate (2).
Unlock and disconnect fuel delivery line (1 and 2).
Close off fuel line (1) with special tool 13 5 161 .
Close off fuel line (2) with special tool 13 5 162 .
Release clamping bolt (1) on steering gear from engine compartment.
Move steering to straight-ahead driving position and remove the ignition key.
Pull off bottom steering shaft (2) with double pivot from steering gear.
Installation note:
Clean thread to remove all remnants of screw locking adhesive.
Replace clamping bolt.
Clamping bolt must rest in groove (2) of lower section of steering shaft (3).
No subsequent retorquing permitted!
Steering shaft can only be inserted in one position on the steering gear.
Tightening torque 32 31 3AZ .
Note 31 00 MOBILE TABLE LIFT document.
Position engine assembly on table top A .
Position transmission on table top B .
Table top B is adjustable in a longitudinal direction (see arrow).
Structure of all-wheel drive vehicle table lift.
Position retaining elements (20) with fixture (50) on table top B for cross member at coordinates 1/3 and 2/7.
Position additional retaining element (20) with fixture (80) on table top B under transmission at coordinates 6/5.
Position retaining elements (20) with fixtures (70) on table top A for front axle support at coordinates 2/1 and 2/8.
Position fixture (10) on table top A for swivel bearing at coordinates 3/1 and 4/8.
Position retaining elements (20) with fixtures (60) on table top A for front axle support at coordinates 6/2 and 5/7.
Setup of table lift (without all-wheel drive)
Position retaining elements (20) with fixtures (50) on table top B for cross member at coordinates 1/4 and 3/7.
Position additional retaining element (20) with fixture (80) on table top B under transmission at coordinates 6/5.
Position retaining elements (20) with fixtures (60) on table top A for front axle support at coordinates 2/2 and 2/7.
Position fixture (10) on table top A for swivel bearing at coordinates 3/1 and 4/8.
Position retaining elements (20) with fixtures (70) on table top A for front axle support at coordinates 6/2 and 6/7.
Possible points for assembly table fixtures on front axle support and cross member.
Attach the swivel bearing fixture (1) to brake disc with wheel studs (2) and fix with adjusting screw (3).
Centering pin missing: Make position of threaded bolt in relation to wheel arch.
Secure spring strut against falling out.
Unscrew nuts (1).
Remove spring strut downwards out of wheel arch.
Installation note:
Clean contact surface at spring strut dome.
Align spring strut using centering pin to bore in wheel arch or stud bolts to the marks in wheel arch and push upwards.
Replace self-locking nuts.
Tightening torque 31 31 1AZ .
Release screws of the transmission cross-member (illustration shows manual gearbox).
Tightening torque 23 71 2AZ/5AZ (A/T) or 23 71 2AZ/5AZ (M/T)
Release bolts (1-3).
Installation note:
Screw (1) M12 x 90
Screw (3) M12 x 53
Screw (2) M12 x 145
Check threads for damage; if necessary, repair with HELICOIL THREAD INSERTS .
Tighten down first screws (1) and then screws (2, 3).
Tightening torque 31 10 1AZ
Installation note:
Position assembly table with front axle support.
The inclination of the table lift (1) can be adjusted using adjusting screw (2).
Reassemble the vehicle.
Fill and bleed hydraulic system.
Check line connections for leak tightness
Check and add engine oil.
Check fault entry.