427137 Disassembling and assembling rear spring strut - with and without PASM
WM 427137 Disassembling and assembling rear spring strut - with and without PASM
Tools
Information
Component and assembly overview (with and without PASM)
There are three different types of running gear: standard running gear, sport-type running gear (Performance) and PASM chassis.
The 911 Carrera S comes with the PASM chassis as standard.
Exploded view of rear spring strut
Disassembling rear spring strut
1. Pre-tension coil spring using spring clamp for spring struts Nr.121 until the piston rod is relieved. The appropriate forks must be inserted into the spring clamp.
Tensioning rear spring
2. To loosen the connection between piston rod and spring-strut mount, counter at the bolts on the spring-strut mount (screw hexagon nuts onto the bolts and use a suitable lever).
Spring strut mount
On PASM spring struts, use a suitable socket wrench insert, e.g. socket wrench insert for ATF temp. switch assembly Nr.18.
3. Remove all parts from the piston rod.
Coil spring/compensating plate allocation
Identification marking -A- comprising two different coloured lines (e.g. one red and one white) indicates the spring constant and spring length (depending on the vehicle version and equipment).
Identification marking -B- comprising one coloured line indicates the coil spring tolerance group (load group) and determines the thickness of the compensating plate. The coloured line -B- is white or green and (depending on the marking) yellow or blue.
Colour marking on coil spring
The compensating plate comes in two thicknesses -Arrows-.
Compensating plate
Rear vibration damper allocation
See allocation in Spare Parts Catalogue.
The item number and colour dot coding is shown on the damper tube.
Assembling spring strut
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 at a suitable place in the vice (use jaw liners).
2. When replacing the vibration damper, fit a new snap ring -10- - using snap-ring pliers VW 161 A - in the relevant groove -A older B- (see allocation in next table).
Fit bottom concave washer -9- with the groove downwards facing the snap ring -10-. Ensure that the snap ring -10- and concave washer -9- are seated correctly.
Snap ring position
Snap ring position: PASM chassis (height -10 mm unlike series C2/C4)
Snap ring position: standard chassis (series C2 / C4 / C4 Targa)
Snap ring position: performance chassis (I 030 / height -20 mm unlike series C2/C4)
3. Place pre-tensioned coil spring (with the tighter end of the spring) on the vibration damper.
4. Slide the bellows/additional spring assembly onto the piston rod.
5. Fit washer.
6. Position spring strut mount -2- onto the piston rod (with supporting mount -2- , compensating part -3- and spring support -4- assembly in correct position).
Place the lug on the spring strut mount in the groove of the piston rod (twist lock of piston rod opposite the supporting mount).
Supporting mount assembly
7. Fit new lock nuts on the piston rod. Place the end of the coil spring on the concave washer stop -Arrow-.
Coil spring
8. Align the spring strut mount with the vibration damper. -Anguss- of spring strut mount must line up with the middle fork of the lower vibration damper.
Positioning spring strut mount
9. Tighten lock nut to 32 Nm (24 ftlb.). Counter at the bolts (M8) on the spring strut mount at the same time.
Spring strut mount
There is no need to counter at the piston rod because there is a strong grip between the spring strut mount and piston rod.
On PASM spring struts, use a suitable socket wrench insert, e.g. socket wrench insert for ATF temp. switch assembly NR.18.
Tightening torque for all 997 rear-axle spring struts: 32 Nm (24 ftlb.).
The tightening torque of 32 Nm (24 ftlb.) applies - even contrary to previously published specifications - for all 997 rear-axle spring struts (conventional and with PASM)!