Porshe 911 (997). Manual - part 301

- Checking the fluid level for the power-assisted steering

Checking the fluid level for the power-assisted steering

Notes on power-steering fluid

Damage to the power-assisted steering is caused by a shortage of oil in the hydraulic system. Even small leaks
can cause the fluid to escape and damage the servo pump as a result of the high oil pressure occurring in the
hydraulic circuit.
Grunt-like noises that can be heard when the steering is locked, or foam formation in the reservoir indicate a
shortage of oil and/or that air has also been sucked in. Before filling the reservoir, any existing leaks must be
eliminated on the suction side. Alternatively, the defective part on the pressure side should be replaced.
Only Pentosin CHF 11 S may be used in the reservoir. Pentosin CHF 11 S can be ordered under the following
part number:
Quantity supplied 1 litre = 000.043.203.33.

Checking fluid level for power-assisted steering

Installation Location:

The reservoir is located in the engine compartment.

Checking the level of steering fluid

There are two marks on the dipstick attached to the reservoir cap. One area is marked "Cold" for when the
engine is cold → "Cold" mark: approx. 20 °C and the other is marked "Hot" for when the engine is warmed
up → "Hot" mark: approx. 80 °C .
Check the level of fluid (Pentosin CHF 11 S) when the engine is idling and cold → "Cold" mark: approx. 20
°C

 .

1.

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Start the engine and let it run for → Period: approx. 20 s . Switch off
engine.

2. Open engine cover. Open reservoir

cap.

3. Wipe off the dipstick. Close and then reopen cap. The fluid level should lie in the hatched area beneath the

"Cold" mark (mark = maximum level) at → "Cold" mark: approx. 20 °C . Top up with Pentosin if
necessary. The higher mark "Hot" is for a fluid temperature of → "Hot" mark: approx. 80 °C .

Do not add too much Pentosin! The respective marks are for the maximum fluid level at the "COLD" or
"HOT" temperature.
If assembly work was performed previously, check fluid level with the engine idling and without operating
the steering.
Multiple steering movements (manoeuvring) with the engine switched off change the fluid level in the
reservoir - fluid level rises. In this case, the engine must be run for at least 20 seconds immediately prior to the
fluid level check.
When topping up or filling in Pentosin, make sure that it does not come into contact with the coolant hoses! If
coolant hoses come into contact with Pentosin, thoroughly clean them with water IMMEDIATELY! Replace
visibly swollen coolant hoses!

Checking the steering system for leaks (visual check)

With engine idling, turn steering wheel as far as the stop and hold still. The maximum possible line pressure
results in this way.
In this position, check all pipe connections for leaks.
Carry out testing for a maximum of → Period: 10 s . A longer check should always be interrupted by a brief
pause after approximately → Period: 10 s .

Bleeding the steering system

1. To fill the whole system after the installation of new steering components or lines or after a

substantial loss of hydraulic fluid, briefly start the engine a few times and, when it fires, switch it
off again immediately. This procedure causes the fluid level in the reservoir to fall rapidly, so
constantly add Pentosin CHF 11 S. The reservoir must not be sucked dry.

2. If the fluid level in the reservoir does not fall any further when the engine is briefly turned over, start the

engine and let it run at idling speed.

3. Rapidly turn the steering wheel from full-lock to full-lock several times so that the air can escape from the

cylinders. At the end positions of the piston, do not pull the steering wheel with more force than is
necessary in order to turn the steering (to prevent unnecessary build-up of pressure initially).

4. Observe fluid level during this procedure. If it continues to fall, add fluid until the level in the

reservoir remains constant and no more air bubbles rise in the reservoir when the steering wheel is
turned.

5. Correct the fluid level with the engine at idling speed and without moving the steering.

997110, 997111, 997120, 997121, 997310, 997311, 997320, 997321, 997410, 997411, 997430, 997431,
997610, 997611, 997620, 997621

Diagnostic system: reading out fault memory and activating systems

Checking fluid level for power-assisted steering

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WARNUNG

Gefahr des Verlusts der Text-Bild-Zuordnung beim Ausdruck.

Aus technischen Gründen kann derzeit nicht ausgeschlossen werden, dass trotz
einwandfreier Darstellung auf dem Bildschirm beim Ausdruck der
Zusammenhang von Text und zugehörigem Bild verloren geht.

• 

Wird der Fehler nicht bemerkt, besteht die Gefahr, daß Arbeiten nicht korrekt
durchgeführt werden und es dadurch zu Personen- und Sachschäden kommt.

• 

→ Vergleichen Sie deshalb nach dem Druckvorgang unbedingt die Ausdrucke mit der
Bildschirmdarstellung. Korrigieren Sie die Ausdrucke im Fehlerfall so, daß der Inhalt der
Bildschirmdarstellung zutreffend wiedergegeben wird.

WARNING

Danger of losing text-figure correspondence when printing out.

For technical reasons, it can currently not be ruled out that the correspondence
between text and associated figure can be lost when it is printed out, even though
the display on the screen is correct.

• 

If the fault is not noticed, there is the danger that work will not be performed
correctly which can cause injury and damage.

• 

→ Therefore, always compare printouts with the screen display after printing them out. Correct
the printouts if they are faulty so that the content of the screen display matches that on the
printouts.

AVERTISSEMENT

Risque de perte de la correspondance texte-illustration lors de l'impression papier.

Pour des raisons techniques, il ne peut pas être exclu à l'heure actuelle que, même
en cas d'affichage correct à l'écran, la correspondance entre le texte et l'illustration
puisse être erronée sur l'impression papier.

• 

Si l'erreur passe inaperçue, on court le risque d'exécuter certaines opérations de
manière incorrecte pouvant conduire à des dommages corporels et matériels.

• 

→ 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

• 

Diagnostic system: reading out fault memory and activating systems

Bleeding the steering system

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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

Bleeding the steering system

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