Contents: Removal ↓ Installation ↓
Removal
The subframe is removed using a scissor lift table. Shorter, safety bolts must be installed in the front engine mount bracket mounting points. The subframe is removed together with the steering gear, front axle drive, lower suspension arms and wheel hub bearing housings. The air springs/shock absorbers with support brackets and upper suspension arms remain on the vehicle.
ATTENTION: Switchable stabilizers must be switched on before starting work. Otherwise, unintentional switching on of the stabilizers may result in injury.
Turn on the hydraulic system of the disconnectable stabilizers.
Loosen the wheel bolts.
Raise the car.
Remove the front wheels.
Install the spring clamp VW 552 on both sides of the vehicle in the upper hole of the wheel arch A and on the upper suspension arm B (Fig. 4.51).
Squeeze the lever slightly to avoid damaging the ball joint.
Press out the upper lever (Fig. 4.52).
In the wheel well, disconnect the brake hoses from the brake drive lines.
Disconnect all electrical wires between the body and the suspension.
Remove the sound insulation under the engine/gearbox.
Unscrew the hydraulic pipe holder 1 (Fig. 4.53).
Unscrew the pressure and drain pipes 2 from the steering gear.
Unscrew the cardan shaft from the front final drive and tie it down.
Disconnect both hydraulic lines 1 and the electrical connection 2 (Fig. 4.54).
When installing, do not mix up the pipelines.
Check if there is a "direction of travel" mark on the front pipe. If not, apply a new one.
While unscrewing the pipes, hold them with an open-end wrench.
Insert the 10-222A/11 rods into the engine bracket loops on the right and left sides (fig. 4.47).
Insert a wooden block A of approximately 300 mm length into the brackets of the rods 10-222 A/ 11 (fig. 4.48).
In this case, the staples should be directed backwards.
Tighten the rod clamps so that the wooden blocks rest on the bracket of the mounted units B.
Place the end of the trolley jack on the engine and gearbox stand VA G 1383 A.
Place the engine and gearbox support VA G 1383 A under the engine bracket and press lightly (Fig. 4.55).
Fix the subframe.
Remove the subframe bolts.
Unscrew the connecting rod on the left and right of the stabilizer.
Lower the subframe using rods 10-222 A/11 by approximately 50 mm.
Use two M14x1.5x90 bolts, such as bolts #104 281 01, to secure the engine mount bracket on the left and right.
Remove the VAG 1383 engine and gearbox support from under the engine bracket.
Screw the supports to the scissor lift table as shown in the figure (Fig. 4.56).
Support the subframe on the lifting table (Fig. 4.57).
Remove rods 10-222A/11 from the subframe.
Carefully remove the air bleed pipe A from the main forward gear (Fig. 4.58).
Now slowly lower the subframe. Always make sure that this happens without any obstruction.
Installation
Installation is carried out in the reverse order, taking into account the following.
Always replace the driveshaft mounting bolts.
Screw the subframe with new bolts (Fig. 4.55).
Remove rods 10-222A/11 from the subframe.
Install the universal joint onto the steering gear and tighten the bolt to the specified torque.
If available, install the screen on the steering gear. Install the front wheels. On vehicles with disconnectable stabilizers, bleed the stabilizers.
Bleed the brake system. After installation, perform a test drive, if the steering wheel is not straight when driving straight, it is necessary to perform a RUDDER.
Table 4.8. Tightening torques for threaded connections
| Component | Tightening torque, Nm |
| Upper arm to bearing housing (Use a new nut.) | 95 |
| Pressure and drain pipes on the steering gear | 30 |
| Cardan joint to steering gear (Use a new bolt.) | 40 + 90° |
| Screen on the steering gear (if any) | 10 |
| Subframe to body (Use new bolts.) | 120 + 180° |
| Connecting rod to the stabilizer (Use a new nut.) | 100 |
| Connection of hydraulic pipelines | 15 |
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