Porshe 911 (997). Manual - part 275

→ Comparez impérativement pour cette raison les impressions papier avec l'affichage à l'écran.
Corrigez-les en cas d'erreur de manière à reproduire correctement l'affichage à l'écran.

ATTENZIONE

Pericolo di perdita dell'abbinamento testo-immagine nella stampa.

Per motivi tecnici non è escluso che, nonostante la rappresentazione sullo schermo
risulti perfetta, durante la stampa venga persa la corrispondenza fra testo e
relativa immagine.

• 

Se tale difetto non viene rilevato vi è il pericolo che i lavori non siano eseguiti
correttamente; ciò può avere come conseguenza lesioni e danneggiamenti.

• 

→ Per questo motivo, dopo la stampa è assolutamente necessario confrontare le stampe con la
rappresentazione sullo schermo. In caso di errore si prega di correggere le stampe, così da
garantire la riproduzione esatta della rappresentazione sullo schermo.

ADVERTENCIA

Al imprimir se corre el riesgo de perder la correcta asignación de las figuras al texto.

Por motivos técnicos, por el momento no se puede descartar que, aun siendo
correcta la imagen que aparezca en la pantalla, al imprimir se pierda la
correlación entre el texto y la figura correspondiente.

• 

Si este error pasara desapercibido, existe el riesgo de que los trabajos no se
ejecuten de forma correcta y, por tanto, se produzcan daños personales y
materiales.

• 

→ Por ello le rogamos que tras el proceso de impresión compare siempre las copias impresas con
la imagen de la pantalla. En caso de error, corrija las copias impresas de forma que se
correspondan con el contenido de la imagen de la pantalla.

Diagnostic system: reading out fault memory and activating systems

Installation

1257

44 95 03 Suspension alignment, complete - as of MY
2005

- Information
- Measuring vehicle at front and rear

Tools

Designation

Type

Number

Explanation

Insert for torque wrench

special tool

96260

socket wrench insert

special tool

P 9730

Information

General procedure for wheel alignment

Performing wheel alignment using an electronic wheel alignment tester. Measurement procedures should be
taken from the operating instructions for the wheel alignment tester involved.
In order to exclude erroneous measurements, the following preconditions must be met before alignment
and the following points should be given special attention:
Empty weight of vehicle according to DIN 70020, i.e. vehicle in ready-to-drive condition with full tank and
including tools but without driver or additional weights.
Ball-joint and wheel-bearing play in order (wheel-bearing play cannot be adjusted).
Tyre pressure in accordance with regulations, fairly uniform tyre tread.
Quick-clamping holder with adapter (for the measured-value pickups) correctly secured to the wheels.
Receiving surfaces for the quick-clamping holder on the wheels and the adapter surfaces must be clean and
flat. Always check the levelling surface on the wheels precisely in particular before fitting the quick-clamping

1258

holders.
Strictly comply with maintenance intervals for measuring equipment and measuring platform. If the levelling
of the measuring platform or measuring station is done in-house, levelling equipment is required. A hose level
gauge is not adequate.
Skilled handling of measuring equipment and measuring platform.
Sliding plates with transverse motion (rotary motion) at the rear axle are advisable.
Observe the Technical Literature of PAG, the manufacturer of the measuring equipment and the manufacturer
of the measuring platform.
Do not treat measured values as a whole, but very critically in regard to driving dynamics, high-speed strength
of the tyres, tyre wear and cost/benefit effects (time required for correction of insubstantial deviations). The
toe values are of decisive significance for driving dynamics and tyre wear.
If the vehicle is measured front and rear, check and adjust the wheel alignment values at the rear axle first.
Camber values at the front axle apply for the straight-ahead position of the wheels. Steering wheel and
steering gear in centre position when toe is being adjusted.
Before wheel alignment values are adjusted at front and rear axles, it is recommended that the vehicle height
be checked at the DIN empty weight. Conclusions can then be drawn about wheel alignment values in the
event of any suspension alignment that becomes necessary later.

Measuring vehicle at front and rear

Vehicle height (height check)

General
The vehicle height at front and rear axle is not adjustable.
Preliminary work
For the height check, place the vehicle on a level surface or on the measuring platform (ready to drive, with a
full tank and tools but without driver or additional weights). Compress (push down) vehicle at front and rear
axles 2-3 times and allow it to spring back freely.
Front axle

Measuring height of front axle (left-hand side)

From road contact surface to hexagon-head bolt of cross-member screw connection to the body.
Nominal value for front and rear axles→  Adjustment values for wheel alignment [997110 997111 997120
997121 997310 997311 997320 997321]→ Adjustment values for wheel alignment [997410 997411 997430
997431 997610 997611 997620 997621].

Diagnostic system: reading out fault memory and activating systems

General procedure for wheel alignment

1259

Rear axle

Measuring the height of the rear axle (right-hand side)

Measure from wheel contact surface to the locating bore in the rear-axle side section (between toe and camber
eccentrics).

Wheel alignment

WARNING

Risk of accident due to incorrect functioning of steering angle sensor if it is uncalibrated or incorrectly
calibrated.

There is a risk of accidents causing physical damage to persons or objects in the PSM testing
area.

• 

→ After working on wheel suspension parts, when replacing the steering-angle sensor and after changing the

wheel alignment values, calibrate the steering angle sensor with the front wheels in straight-ahead position
using the PIWIS tester.

→ Check the actual value of the steering angle sensor after a suspension alignment where no changes were

made to the wheel alignment values.

Notes
Only check or adjust wheel-alignment values when prescribed preconditions are met. → 449503 Suspension
alignment complete - chapter on "Information"
If the vehicle is measured front and rear, check and adjust the rear axle first. After adjustment, tighten the
appropriate threaded connections with the prescribed tightening torque. See tables in Repair Group 40
→ 401000  Tightening torques for front axle and Repair Group 42 → 421000  Tightening torques for rear axle.
The steering-angle sensor must be calibrated if the previous wheel alignment values (on rear and/or
front axle) were changed!

Rear axle

Preliminary work
Prepare vehicle for checking and/or adjustment of wheel alignment values. Place front wheels on rotary table
and rear wheels on rotary / sliding plates. Compress vehicle at front and rear axles by approximately 25 mm
2-3 times and allow it to spring back freely.

Diagnostic system: reading out fault memory and activating systems

Vehicle height (height check)

1260