Porshe 911 (997). Manual - part 158

Item

Designation

Explanation

1

Catalytic converter

2

Oxygen sensor behind catalytic converter

Grease threads for re-installation

3

Oxygen sensor ahead of catalytic converter

Grease threads for re-installation

4

CO removal position

Replace seal if opened

5

Flange seal

Replace; observe installation and beading position!

6

Hexagon nut, M8

Replace

7

Exhaust manifold

8

Catalytic converter holder to engine carrier

9

Clamps on catalytic converter holder

Clamping sleeve, rear silencer to catalytic converter

1. Screw off M8 fastening nuts on clamping sleeve and slide sleeve onto the silencer pipe. If corroded,

spray sleeve with penetrating oil or heat it up.

2. Loosen clamp on catalytic converter

holder.

Catalytic converter flange joint

3. Loosen threaded flange joint to exhaust manifold -1- . Replace lock nuts.

4. Lift catalytic converter out of the

vehicle.

Diagnostic system: reading out fault memory and activating systems

Removing catalytic converter

789

Installing catalytic converter

Installing catalytic converter

Note

Always expose oxygen sensor wire far enough for it to be able to turn when unscrewing the sensor.

• 

Note

Replace clamping sleeve, seal and lock nuts. Apply a light coating of high-temperature grease on the
sleeve before installation to facilitate fitting.

• 

1. Grease new clamping sleeve with high-temperature paste and slide it onto the

silencer pipe.

2. Insert catalytic converter into the vehicle. When doing so, watch out for the oxygen sensors and

cable.

Note

Observe installation position of three-hole flange seal. The beading is facing the exhaust manifold
and the edges must not project over the contour of the flange.

• 

3. Fit new seal and new lock nuts on the exhaust manifold flange and screw on slightly.

Installation position of clamping sleeve

4. Slide the clamping sleeve over the silencer pipe and move it to installation position → Installation

position of clamping sleeve , then screw on the two hexagon nuts.

Diagnostic system: reading out fault memory and activating systems

 Installing catalytic converter

790

Catalytic converter flange joint

5. Tighten three lock nuts -1- on catalytic converter flange. → Tightening torque: 23 (17 ftlb.) Nm

6. Tighten fastening screws on clamping sleeve. → Tightening torque: 23 (17 ftlb.) Nm

7. Align clamp on catalytic converter holder and tighten M8 screw. → Tightening torque: 23 (17 ftlb.) Nm

Subsequent work

Subsequent work

Note

Grease the thread of the oxygen sensors that will be fitted again with Optimol Optimoly Paste MF.

• 

Replace sealing ring. If this is not possible, the "old" oxygen sensor must be tightened to 50 Nm (37
ftlb.).

• 

1. Install oxygen sensor behind catalytic converter. If the sensor ahead of the catalytic converter was

also removed, install this as well. → 247319 Removing and installing oxygen sensor behind
catalytic converter - section on "Installing"; → 246919 Removing and installing oxygen sensor
ahead of catalytic converter - section on "Installing"; → 241000  Precautionary measures when
handling oxygen sensors.

2. Lay oxygen sensor cable carefully and connect cable plug.

3. Install air cleaner housing → 242519 Removing and installing air cleaner housing - section on

"Installing".

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

Installing catalytic converter

791

C23, C24, C25, C26, C27, C28, C32, C33, C34, C35, C36, C37, C38, C39, C45, C46, C98, C99

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
risulti perfetta, durante la stampa venga persa la corrispondenza fra testo e
relativa immagine.

• 

Diagnostic system: reading out fault memory and activating systems

Subsequent work

792