427137 Disassembling and assembling rear spring strut
WM 427137 Disassembling and assembling rear spring strut
Tools
Information
Component and assembly overview (with and without PASM)
There are two different types of suspension: standard running gear and PASM chassis.
The Boxster S and Cayman S come with the PASM chassis as standard.
Rear spring strut (exploded view)
Disassembling and assembling rear spring strut
Disassembling spring strut
CAUTION
Increased risk of accidents due to spring tensioning.
- Danger of injury and damage from springs jumping out.
-> Never use an impact bolter to loosen or tighten the fastening nut.
-> Use a commercially available changeover ratchet.
1. To prevent damage (deformation), clamp the spring strut in a suitable clamping block (tensioning device for MacPherson spring struts). Alternatively, the spring clamp can also be held in a retaining device.
2. Tension the coil springs using a spring clamp for spring struts NR.121 until the piston rod is relieved. The appropriate forks must be inserted into the spring clamp.
Tensioning coil springs
3. Remove spring strut mount. To do this, loosen the lock nut on the piston rod (coil spring is pretensioned).
Use a socket-wrench insert P 9630/2 to loosen the lock nut on conventional spring struts. On PASM spring struts, use a suitable socket-wrench insert, e.g. socket-wrench insert for ATF temp. switch assembly NR.18.
When loosening the nut, counter at the piston rod (hexagon socket) or at the two grooves (cut-outs) on the stop plate (for PASM spring struts). Tools required: retaining tool P 9630/1 and for conventional spring struts arm bracket P 9630.
Disassembling spring strut (PASM spring strut)
4. Remove all parts from the piston rod.
Coil spring/compensating plate allocation
Identification marking -1- comprising two different coloured lines (e.g. one silver and one violet line) indicates the spring constant and spring length (depending on the vehicle version and equipment). Identification marking -2- comprising one coloured line indicates the coil spring tolerance range (load group) and determines the thickness of the spring plate (compensating plate). The coloured line (identification marking -2- ) is white or green and (depending on the marking) yellow or blue.
Colour marking on spring and damper
The spring plate (compensating plate) comes in two thicknesses -arrows-.
Spring plate (compensating plate)
1) If you are installing new coil springs, then order the 3.5 mm and 6.5 mm spring plates (compensating plate) at the same time. Since coil springs of load group 1 or 2 will be supplied, you will then have the correct spring plates (compensating plates) for installation.
2) In production there have been deviations from the general allocation of spring plates (thickness of compensating plate), in some cases different spring plates (compensating plates) have been installed. This was necessary due to the tolerances of the coil springs. In the event of replacement: This means that if the coil spring is to be re-used, then install the spring plate (compensating plate) with the same thickness. If the coil springs are replaced (only replace in pairs), then the allocation given above applies.
Allocation of vibration dampers
See allocation in Spare Parts Catalogue.
The marking, item number and colour dot coding -3- are shown on the damper tube. The colour dot coding differentiates the vibration dampers.
Colour marking on springs and dampers
Assembling rear spring strut
CAUTION
Increased risk of accidents due to spring tensioning.
- Danger of injury and damage from springs jumping out.
-> Never use an impact bolter to loosen or tighten the fastening nut.
-> Use a commercially available changeover ratchet.
Information
- Observe the correct allocation (vehicle version and equipment) when installing new coil springs and/or shock absorbers.
- Observe allocation of compensating plate according to the coil spring tolerance range.
- Coil springs are only available in pairs.
1. Clamp the spring strut in a suitable clamping block (tensioning device for MacPherson spring struts). Alternatively, the spring clamp can also be held in a retaining device.
2. Slide the bellows/additional spring assembly onto the piston rod.
3. Push the pretensioned coil spring onto the vibration damper so that the end of the coil spring rests against the spring plate stop. Fit stop plate -7- at the correct position.
Rear axle spring/stop plate
4. Fit spring plate (compensating part) with support ring and spring strut mount. Position the support ring correctly. The cut-outs in the support ring must be positioned between the collars of the three fastening pins -arrows-.
Correct support ring position
5. Position the spring strut mount. Also align the stop plate in the case of PASM spring struts.
5.1. Fit stop plate at the correct position (curved side up) and screw a new lock nut onto the piston rod (do not tighten fully).
5.2. The spring strut mount is positioned correctly if the fastening pin on the sloping supporting mount part is flush with the retaining bracket on the damper tube => Positioning spring strut mount.
5.3. Then align the stop plate with the spring strut mount for PASM spring struts.
This means that there are four depressions in the spring strut mount bearing location. The two cut-outs on the stop plate must be positioned over the two depressions on the spring strut mount.
Positioning spring strut mount
6. Tighten the lock nut on the piston rod to 80 Nm (59 ftlb.) (for conventional and PASM spring struts).
Use a socket-wrench insert P 9630/2 to do this on conventional spring struts. On PASM spring struts, use a suitable socket-wrench insert, e.g. socket-wrench insert for ATF temp. switch assembly NR.18.
When tightening the nut, counter at the piston rod (hexagon socket) or at the two grooves (cut-outs) on the stop plate (for PASM spring struts).
Tools required: For PASM spring struts, use a retaining tool P 9630/1 and for conventional spring struts, use an arm bracket P 9630.
Assembling spring strut (PASM spring strut)