Sub-Frame Front, Replacing
Sub-frame front, replacing
Special tools:
999 5716 Reading off tool 999 5716 Reading Off Tool
999 5460 Lifting hook 999 5460 Lifting Hook
999 5045 COMPRESSION HOOK 999 5045 Compression Hook
951 2050 BEVEL PROTRACTOR 951 2050 Bevel Protractor
Preparation
- Diesel only. Remove the engine cover
- Install lifting beam 999 5716 Reading off tool 999 5716 Reading Off Tool. Install lifting hooks 999 5460 Lifting hook 999 5460 Lifting Hook
- Lift the engine to relieve the load on the engine pads.
Remove
- the front wheels
- the splash guard under the engine.
- the air duct cover.
- the cable duct screw.
Remove
- the oil pipes from the steering gear from the snap fasteners on the sub-frame
- the hose for the EVAP canister along the sub-frame (does not apply to diesel cars)
- the fuel line for the engine block heater and the engine block heater (if applicable) on the left side of the sub-frame.
Remove
- the hose for the EVAP canister in the joint by pulling apart the hose. Pull it forwards under the anti-roll bar and remove it from the snap fastener on the sub-frame. (Does not apply to Diesel).
Remove
- the mounting for the exhaust pipe on the bracket
- the screws holding the bracket for the exhaust pipe. Release the brake pipe from the snap fastener on the bracket
- the bracket.
- Remove the heated oxygen sensor (HO2S) wiring from the mounting. (Does not apply to Diesel).
- Remove the anti-roll bar links from the anti-roll bar. Counterhold using a Torx wrench so that the ball joint boot is not damaged.
- Remove both the nuts retaining the lower torque rod
- Remove the screw and bend up the bushing with the holder towards the torque rod.
- Remove the front engine pad screw.
- Slacken off the right lower front section of the fender liner
- Remove the plastic nuts on the fender liner
- Remove the splash guard
- Bend out the fender liner.
- Remove both the right hand engine mounting screws.
- Remove the four nuts and the screw holding the steering gear to the sub-frame
- Remove the delivery line from the clips on the sub-frame
- Remove nut (A) holding the lower half of the collision protection. (Applies only to right-hand drive cars).
- Remove the nuts from the ball joints. Counterhold with a Torx wrench so that the ball joint boot is not damaged.
Removing the sub-frame
- Remove and hang up the engine block heater (if applicable) on the left front mounting for the sub-frame
- Position a lifting table under the sub-frame
- Remove the screws holding the sub-frame brackets to the bodywork on both sides
- Remove the four screws from the sub-frame
- Carefully lower the sub-frame.
Note! Ensure that the steering gear screws release from the sub-frame.
Hang the steering gear from a hook 999 5045 COMPRESSION HOOK 999 5045 Compression Hook so that the lower steering shaft does not come apart.
On right-hand drive cars the hook is installed on the right-hand side.
Transferring components
Transfer
- the control arms. Use new screws and new nut. Tighten the front screws. Tighten to 65 Nm. Angle-tighten 90°. Use bevel protractor 951 2050 BEVEL PROTRACTOR 951 2050 Bevel Protractor. Tighten the rear screw. Tighten to 105 Nm. Angle-tighten 90°
- the anti-roll bar. Tighten to 60 Nm
- the right-hand engine mounting. Tighten the screws. Tighten to 65 Nm. Angle-tighten 60°
- the mounting for the heated oxygen sensor (HO2S) wiring
- the engine pad.
Install new pipe / hose holders.
Installing the sub-frame
- Position the sub-frame on a lifting table
- Carefully lift the sub-frame
- Locate the control arms on the ball joints and the steering gear on its mountings
- Remove the hook (999 5045) that is holding the steering gear
- Lift the sub-frame up completely
- Reinstall the engine block heater (if applicable).
- Install the engine block heater (if applicable) on the left front mounting for the sub-frame
- Install the four screws in the sub-frame together with the sub-frame brackets. Use new screws. Lubricate the screws
- First tighten the screws on the left side of the sub-frame. Tighten to 105 Nm. Angle tighten to 120°. Then tighten the right-hand side to the same value
- Finally tighten the screws for the brackets on both sides to 50 Nm.
Finishing
Install
- the right-hand engine mounting. Use new screws. Tighten to 35 Nm. Angle-tighten 90°.
- the front engine pad. Tighten to 50 Nm.
- lower torque rod. Tighten the screw and nut. Tighten to 35 Nm. Angle-tighten 90°.
The lower torque rod must be tightened last to avoid tension being introduced.
Tighten the front nuts. Tighten to 65 Nm. Angle-tighten 90°. Use bevel protractor 951 2050 BEVEL PROTRACTOR 951 2050 Bevel Protractor.
Note! Use new screws and nuts.
- the fender liner and the splash guard with both the plastic nuts.
- the four nuts and the screw holding the steering gear. Use new nuts and a new screw. Tighten to 50 Nm
Clip the cable in position.
the nut (A), holding the lower half of the collision protection system. (Applies only to right-hand drive cars). Tighten to 50 Nm.
- the wiring for the heated oxygen sensor (HO2S) in its mounting. (Does not apply to diesels).
- the mountings for the exhaust pipe on the bracket. Tighten to 10 Nm
- the brake pipe on the bracket for the exhaust pipe
- the bracket for the exhaust pipe. Tighten the bracket screws. Tighten to 25 Nm.
- EVAP canister hose. Press the joint together.
- oil pipes to steering gear
- any fuel line for engine block heater
- any engine block heater.
- new nuts on the ball joints. Tighten. See: Tightening torque [1][2]Mechanical Specifications. Counterhold using a Torx wrench to prevent damaging the ball joint boot.
- the anti-roll bar links. Use new nuts. Tighten to 50 Nm. Counterhold with a Torx wrench so that the boot is not damaged.
- the cable duct screw.
- the air duct cover.
- the splash guard under the engine. Tighten to 20 Nm
- Lower the car.
- Install the wheels. See Installing wheels Service and Repair
- Remove the lifting tools for the engine
- Install the engine cover (diesel engines only).