STB47-16

911 (993)
Technical Information
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ENU
4495
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Replacement Shock Absorbers
Vehicle type:
911 Turbo (993)
Model Year:
As of 1996 up to 1998
Subject:
Replacing shock absorbers (Strut inserts)
Information:
Shock absorber for the respective chassis no longer available
Notes:
During repairs, the faulty shock absorber will be replaced by a new shock absorber of similar design. The
functional dimensions of the new shock absorberare the same as the shock absorber that is installed as
standard.
The components MUST always be replaced on both sides of axle.
The following table shows the possible chassis variants and the corresponding shock absorbers required
for replacement.
Please check this when ordering parts! For further information: see Porsche Electronic Parts Catalog
(PET).
Standard:
The standard chassis was installed on the 911 Turbo and 911 Turbo with Turbo Look (M491).
Front axle
Standard Part No. – Approved
Manufacturer
993.343.041.04/.042.04 – worldwide Boge
993.343.041.35/.042.35 – worldwide Monroe
Part numbers (replacement)
993.343.041.39/.042.39 – Shock absorber,
left/right (1 x), color: red
Rear axle
993.333.051.12/.052.12 – Rest of the Boge
world (RoW)
993.333.051.13/.052.13 – USA
Boge
993.333.051.35/.052.35 – RoW
Monroe
993.333.051.36/.052.36 – USA
Monroe
2016© Porsche Cars North America, Inc.
993.333.051.39 – Shock absorber (2 x), color:
red
Also use: 993.333.073.04 –
Suspension/stabilizer (2 x)
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Parts list:
Figure 1
Parts included for front axle:
993.343.041.39
1x
Shock absorber assembly, left – color: red (not shown)
993.343.042.39
1x
Shock absorber assembly, right – color: red  Figure 1 -1-
993.343.505.01
2x
Bellows-type protective tube  Figure 1 -5-
900.380.005.09
8x
Hexagon nut, M8 (supporting mount, not shown)
Front-axle shock absorber assembly always comprises:
———
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1x
Shock absorber, left (not shown) or right ( Figure 1 -1-)
964.343.502.03
1x
Lock nut – lower (color: black)  Figure 1 -2-
964.343.503.02
1x
Adjusting nut – upper (color: black)  Figure 1 -3-
999.084.441.09
1x
Hexagon nut, M14 x 1.5 – DIN 985  Figure 1 -4-
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Figure 2
Parts included for rear axle:
993.333.051.39
2x
Shock absorber assembly, left/right – color: red  Figure 2 -1-
993.343.505.01
2x
Bellows-type protective tube  Figure 2 -7-
993.333.073.04
2x
Suspension/stabilizer  Figure 2 -8-
900.380.005.09
8x
Hexagon nut, M8 DIN EN 1664 (supporting mount, not shown)
900.380.008.01
4x
Hexagon nut, M10 (suspension/stabilizer, not shown)
Rear-axle shock absorber assembly always comprises:
———
1x
Shock absorber ( Figure 2 -1-)
993.333.504.81
1x
Concave washer (lock nut, silver)  Figure 2 -2-
964.333.105.82
1x
Additional spring, plastic  Figure 2 -3-
999.025.230.03
1x
Concave washer, 14 x 48 x 3.5  Figure 2 -4-
993.333.466.81
1x
Sleeve  Figure 2 -5-
999.084.445.0B
1x
Hexagon nut, M12 x 1.25 – DIN 985  Figure 2 -6-
Spare parts:
All parts specified with a Porsche part number in the Parts List are available separately as spare parts
(see also Porsche Electronic Parts Catalog – PET).
Tools:
V.A.G 1752 - Tensioning device for spring struts or commercially available tensioning device
V.A.G 1332 - Torque wrench, 40-200 Nm (30-148 ftlb.)
9647 - Hook wrench or commercially available hook wrench
Shop light
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Work Procedure: 1
2
Technical Information
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Preparatory work
1.1
Position the vehicle on the lifting platform and lift it.
1.2
Remove faulty spring strut including second spring strut on the other side of the vehicle.
1.2.1
Front axle  Workshop Manual 40 8519 Removing front spring strut.
1.2.2
Rear axle  Workshop Manual 42 7119 Removing rear spring strut.
Convert and install spring strut for front axle.
2.1
Measure dimension X1 (top of adjusting
nut/mounting point for shock absorber 
Figure 3 -X1-) on the standard spring strut.
1
2
3
4
X1
–
–
–
–
–
Standard shock absorber
New shock absorber
Adjusting nut
Mounting point for shock absorber
Dimension of top of adjusting
nut/mounting point for shock
absorber
Figure 3
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911 (993)
Technical Information
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Adjust dimension X2 (top of adjusting
nut/mounting point for shock absorber 
Figure 4 -X2-) in accordance with dimension
X1 (standard spring strut).
1
2
3
4
5
X1
X2
2.3
7/16
–
–
–
–
–
–
Standard shock absorber
New shock absorber
Adjusting nut
Mounting point for shock absorber
Lock nut
Dimension of top of adjusting
nut/mounting point for shock
absorber (standard spring strut)
– Dimension of top of adjusting
nut/mounting point for shock
absorber (new spring strut)
Secure lock nut ( Figure 4 -5-) to adjusting
nut ( Figure 4 -3-).
Figure 4
Tightening torque 50 Nm (37 ftlb.) +/-5 Nm (+/-3.5 ftlb.)
2.4
2.5
Disassemble faulty spring strut ( Workshop
Manual 4085 Disassembling front spring
strut) and assemble new spring strut as
shown in Figure 5 ( Figure 5 ).
1
2
3
4
5
–
–
–
–
–
6
7
8
9
10
11
12
–
–
–
–
–
–
–
13
–
14
–
Shock absorber (new)
Lock nut (new)
Adjusting nut (new)
Concave washer (lower, re-use)
Coil spring (re-use, ONLY for lowered
chassis: new)
Bellows-type protective tube (new)
Concave washer (upper, re-use)
Spacer sleeve (re-use)
Supporting mount (re-use)
Hexagon nut, M8 (new)
Nut, M14 x 1.5 (new)
Seal (perform visual inspection, use
new seal if necessary)
Push-on connector for ABS line
(re-use)
Wear indicator clip (re-use)
Figure 5
Convert new spring strut for the other side of the vehicle in the same way.
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2.6
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Install both spring struts  Workshop Manual
40 8519 Installing front spring strut (front
axle, right:  Figure 6 ).
1
2
3
4
5
6
–
–
–
–
–
–
Coil spring
Bellows-type protective tube
Vibration damper
Concave washer (lower)
Adjusting nut
Lock nut
ONLY for vehicles with lowered chassis
(M033): Also install spring struts on rear axle
(see Step 3)!
3
Convert and install spring strut for rear axle.
Figure 6
3.1
Measure dimension X1 (spring plate –
lower/bush for shock absorber  Figure 7
-X1-) on the standard shock absorber.
1
2
3
4
X1
–
–
–
–
–
Standard shock absorber
New shock absorber
Spring plate – lower
Bushing for shock absorber
Dimension of spring plate
(lower)/bush for shock absorber
Figure 7
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3.2
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Adjust dimension X2 (spring plate –
lower/bushing for shock absorber Figure
8 -X2-) in accordance with dimension X1
(standard spring strut).
1
2
3
4
5
X1
X2
– Standard shock absorber
– New shock absorber
– Spring plate – lower = Concave
washer (lock nut, silver)
– Bushing for shock absorber
– Joint bearing
– Dimension of lower spring
plate/bushing for shock absorber
(standard spring strut)
– Dimension of lower spring
plate/bushing for shock
absorber(new spring strut)
Figure 8
3.3
Prepare shock absorbers for installation
(left/right side of vehicle  Figure 9).
1
2
3
X
– Joint bearing
– Spring plate – lower = Concave
washer (lock nut, silver)
– Bushing for shock absorber
– Dimension = 21°
3.3.1
Loosen joint bearing slightly from
the concave washer (lock nut, silver
 Figure 9 -2-).
3.3.2
Adjust dimension X = 21° as
required ( Figure 9).
3.3.3
Screw concave washer (lock nut, silver  Figure 9 -2-) hand-tight to the joint
bearing ( Figure 9 -1-).
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Figure 9
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3.4
Disassemble faulty spring strut ( Workshop
Manual 4271 Disassembling rear spring
strut) and assemble new spring strut as
shown in Figure 10 ( Figure 10 ).
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
3.5
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– Shock absorber (new)
– Concave washer (lock nut, silver –
new)
– Coil spring (re-use, ONLY for lowered
chassis: new)
– Additional spring, plastic (new)
– Bellows (new)
– Concave washer, 14 x 48 x 3.5
(new)
– Sleeve (new)
– Plate (re-use)
– Intermediate piece, 3.0/5.5/8.0
mm (re-use)
– Supporting mount (re-use)
– Hexagon nut, M8, DIN EN 1664
(new)
– Stop plate (re-use)
– Hexagon nut, M12 x 1.25 (new)
– Suspension/stabilizer (new)
– Hexagon nut, M10 (new)
Figure 10
Convert new spring strut for the other side of the vehicle in the same way.
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911 (993)
Technical Information
3.6
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Install both spring struts, see also 
Workshop Manual 42 7119 Installing rear
spring strut.
1
2
3
4
5
6
–
–
–
–
–
–
Coil spring
Concave washer (lock nut, silver)
Joint bearing
Shock absorber
Suspension/stabilizer
Anti-roll bar
3.6.1
Loosely pre-fit left/right spring strut
at the relevant installation position
in the vehicle.
Loosen concave washer (lock
nut) slightly if necessary and turn
joint bearing/shock absorber
slightly into position so that it is
connected without tension to the
body/steering knuckle.
3.6.2
Figure 11
Secure concave washer (lock nut) to joint bearing.
Tightening torque 100 Nm (74 ftlb.)
3.6.3
4
Fit new suspension/stabilizer as shown in Figure 11 ( Figure 11 ).
Concluding work
4.1
Perform complete suspension alignment  Workshop Manual 440503 Suspension
alignment, complete
Adjustment values  Workshop Manual 4405 Adjustment values for suspension alignment
4.2
Remove vehicle from lifting platform.
40 95 20 00:
–Removing and installing front spring strut (2 x)–
40 90 20 50:
–Removing and installing front shock absorber (2 x)–
42 71 20 00:
–Removing and installing rear spring strut (2 x)–
42 72 20 50:
–Removing and installing rear coil spring (2 x)–
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Labor time: 150 TU
Labor time: 90 TU
Labor time: 160 TU
Labor time: 80 TU
Feb 10, 2016
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44 95 03 00:
–Performing suspension alignment at front and rear–
Labor time: 100 TU
44 95 15 50:
–Adjusting vehicle at front and rear–
Labor time: 200 TU
Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. If a particular condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your authorized Porsche Dealer for the latest information
about whether a particular technical bulletin applies to your vehicle. Part numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify the current and
correct part numbers. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS
Tester are the ones that must be followed.
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Dr. Ing. h.c. F. Porsche AG is the owner of numerous trademarks, both registered and unregistered, including without limitation the Porsche Crest®, Porsche®, Boxster®, Carrera®, Cayenne®,
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