Replacing the Front Sub-Frame
Replacing the front sub-frame
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
(6 cylinder engines only) Installing the lifting tools. See Lifting tools Removing/Installing for 6 cylinder cars Lifting Tools Removing/Installing.
- (Diesel engines 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 (Does not apply to diesel)
- the fuel line for the engine block heater and the engine block heater (if applicable) on the left side of the sub-frame.
- the hose for the EVAP canister in the joint by pulling apart the hose. Route the hose under the anti-roll bar. (Does not apply to Diesel).
Remove:
- the mounting for the exhaust pipe on the bracket
- the screws holding the exhaust pipe bracket. Disconnect the brake pipe from the snap fasteners on the bracket
- the bracket.
- Remove the cable harness from the rear edge of the sub-frame. Disconnect the connectors. (Applies only to cars with 6-cylinder engines)
- Remove the heated oxygen sensor (HO2S) bracket from the mounting.
- Remove the anti-roll bar links from the anti-roll bar. Counterhold with 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 part of the fender liner.
- Remove the plastic nuts on the fender liner
- Remove the splash guard
- Bend out the fender liner.
Remove the four vibration damper screws. Counterhold the crankshaft central nut.
Remove:
- the vibration damper (applies to 6-cylinder cars).
- 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 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 are released 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.
- Install the four screws in the subframe together with the sub-frame brackets. Use new screws. Lubricate the screws
- First tighten the screws on the left-hand side of the sub-frame. Tighten to 105 Nm. Angle-tighten 120°. Then tighten the right-hand side to the same values
- 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 vibration damper. Use new screws. Tighten to 35 Nm. Angle-tighten 90°. (Applies to cars with 6 cylinder engines.).
- the front engine pad. Tighten to 50 Nm.
- lower torque rod. Tighten to 35 Nm. Angle-tighten 90°.
The lower torque rod must be tightened last to avoid tension being introduced.
Tighten the nuts. Tighten to 65 Nm. Angle-tighten 90°. Use bevel protractor 951 2050 BEVEL PROTRACTOR 951 2050 Bevel Protractor.
Note! Use new screws and new nuts.
- the fender liner and the splash guard with both the plastic nuts.
- the four nuts and screws holding the steering gear. Use new nuts and new screws. Tighten to 50 Nm
Clip the cable in position.
nut (A), holding collision protection lower half. (Applies only to right-hand drive cars). Tighten to 50 Nm.
- the cable harness at the rear edge of the sub-frame and connect the connectors. (Applies only to cars with 6-cylinder engines)
- the heated oxygen sensor (HO2S) bracket in its mounting.
- the mounting for the exhaust pipe on the bracket. Tighten to 10 Nm
- the brake pipe on the exhaust pipe bracket
- the exhaust pipe bracket. Tighten the bracket screws. Tighten to 25 Nm.
- EVAP canister hose. Press the joint together. (Does not apply to Diesel).
- the oil pipe to the steering gear
- the hose for the EVAP canister (Does not apply to diesel)
- any fuel line for engine block heater
- any engine block heater.
- new nuts on the ball joints. Tighten to 80 Nm. Counterhold with a Torx wrench so that the ball joint boot is not damaged.
- 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.
- Install the wheels according to Installing wheels Service and Repair.
Lower the car
- Remove the lifting tools. See Lifting tools Removing/Installing for 6 cylinder cars Lifting Tools Removing/Installing (applies to 6-cylinder engines)
- (Diesel models only) Install the engine cover.