Disassembling and Assembling Rear Spring Strut - GT3
Disassembling and assembling rear spring strut - GT3Notes about adjustment work on the spring struts
The spring strut has a thread and a height adjusting nut No. 2 for height adjustment. The height adjusting nut No. 2 is secured against turning by the lock nut No. 1.
The stabilizer block - No. 4 - (mounting saddle for the stabilizer mount) is also fitted on the thread. The stabilizer block can be vertically adjusted and it is provided with a lock nut No. 3. This adjustment possibility is only useful for racing. It can be used to ensure that enough clearance is available for the stabilizer mount even for deviating vehicle heights (only for racing) and also that the stabilizer mount can be fitted free of tension.
The stabilizer block No. 4 does not need to be adjusted for the vehicle height prescribed for street use.
The stabilizer block No. 4 - dimension B and dimension C - is also set with replacement dampers.
1 Lock nut
2 Height adjusting nut
3 Lock nut
4 Stabilizer block
Dimension A = pre-setting dimension for production (185 mm). The dimension may be different with the prescribed vehicle height.
Dimension B = 105 mm (plus/minus 1 mm)
Dimension C = 90 degrees (see illustration 42930001)
Disassembly and assembly instructions
Disassembly
- If necessary, tension the coil spring with the spring clamp until the piston rod is relieved.
- To undo the connection (piston rod to spring strut mount) counter at the piston rod with a 7-mm open-ended wrench. Important: Never use an impact bolter to loosen or tighten the fastening nut.
- Remove all parts from the piston rod.
Preliminary work and notes on assembly
- Replace nut for fastening the piston rod on the spring strut mount.
- It is recommended to replace the coil springs only in pairs.
Note!
^ If the vibration damper is to be replaced, set the height adjusting nut No. 2 to the same position as on the old vibration damper (transfer the actual dimension A to the new vibration damper).
A hook wrench insert - special tool 9647 - is required for this purpose.
Special tool 9647 is required to change the vehicle height (dimension A) and to adjust the stabilizer mating bearing No. 4 - on the front and rear axles.
The special tool is used together with a torque wrench to tighten the lock nuts (slotted nuts) on the spring struts. Tightening torques in Front Wheel Suspension, Drive Shafts/Rear Wheel Suspension, Axle Shaft.
Important: The stabilizer mating bearing (mounting saddle No.4) need not be adjusted for street use.
1 Lock nut
2 Height adjusting nut
3 Lock nut
4 Stabilizer mounting saddle
Special tool 9647
Assembly
- Push additional spring No. 8 onto the piston rod.
- Slide the disc No. 7 and stop plate No. 6 (stop plate No. 6 in correct position) as far as they will go onto the piston rod.
- Place coil spring in the correct position - tighter winding facing down - on the vibration damper.
Note!
^ The coil spring is equipped with an approximately 50 mm long protective sheath at the top. This protective sheath is not yet present on vehicles from the initial production run.
A Top
B 10 mm
C Protective sheath approximately 500 mm long
- Place spring plate on the coil spring.
- Place stop plate in the correct position on the spring strut mount. Screw new fastening nut onto the piston rod until approximately 1 to 2 threads are visible above the fastening nut.
- Position the spring strut mount for installation (correctly position spring strut mount with respect to the damper).
Note!
^ The mounts for the right and left sides are identical parts.
- The spring strut mount is positioned correctly if one of the 3 fastening pins is aligned with the stabilizer mounting saddle.
- Once the mount has been positioned correctly, tighten the fastening nut to 60 Nm (44 ft. lbs.). When tightening the fastening nut, hold at the piston rod using a 7-mm open-ended wrench.
Note!
^ Never use an impact bolter to tighten the fastening nut.