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Home >> Porsche >> 2016 >> 911 Turbo, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Exhaust System/Emission Control - 911 CARRERA (996)) >> Replacing anti-run-on valve for secondary air >> Removing anti-run-on valve and check valve

Removing anti-run-on valve and check valve

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • Pentosin is hazardous to the health!
  • Wear protective gloves and goggles. If the eyes or skin come into contact with the fluid, wash immediately with water!
  • Collect emerging Pentosin!
  • Protect the leads against soiling and damage with caps!
  • Clean hoses thoroughly which come into contact with Pentosin!
CAUTION: Danger of scalding when the engine is hot; coolant is under pressure. Do not begin working until the engine has cooled down!
  • Carefully open the cap on the expansion tank.
  • Coolant is hazardous to the health and irritates the skin!
  • When handling coolant, wear protective gloves and goggles!
  • In case of contact with the skin or eyes, wash immediately with plenty of water!
  1. Attach protective covers to the rear of the vehicle to avoid damaging the paint.
    NOTE: Note the work instructions for disconnecting and reconnecting the battery.
  2. Disconnect battery. See WORK INSTRUCTIONS AFTER DISCONNECTING THE BATTERY .
  3. Remove air cleaner housing. Refer to REPLACING AIR CLEANER ELEMENT .
  4. Remove throttle body. To do so, pull off the cable plug from the throttle body, undo the four M6 x 25 hexagon-head bolts and remove the throttle body.

    Steps 5 - 6 refer to  Fig 1 

  5. Press together the plug connection on top and bottom of the central intake distributor -3-  and pull out the pipe.
  6. Disengage switch-over valve of the tank ventilation -4-  from the plastic clip and pull off cable plug.
    7. Fig 1: Pressing Together Plug Connection Of Central Intake Distributor & Disengaging Switch-Over Valve Of Tank Ventilation
    G03114522Courtesy of PORSCHE OF NORTH AMERICA, INC.
  7. Remove coolant bleeder hose -arrow-  by undoing the spring-band clamp and then pulling off the hose. Collect any draining water.
    Fig 2: Removing Coolant Bleeder Hose
    G03114523Courtesy of PORSCHE OF NORTH AMERICA, INC.
  8. Remove central intake distributor by undoing all four screw-type hose clamps -2-  and then pressing the rubber sleeves on the left and right off the central intake distributor with a suitable tool. Remove central intake distributor.
    Fig 3: Removing Central Intake Distributor By Undoing All Four Screw-Type Hose Clamps
    G03114524Courtesy of PORSCHE OF NORTH AMERICA, INC.
  9. Remove the vacuum lines from both rubber sleeves and remove the rubber sleeves with the screw-type hose clamps.
  10. In vehicles with air conditioning, the following work operations must be performed:
    • a. Remove the drive belt from the belt pulley of the air-conditioning compressor. Mark the running direction of the belt with a coloured pen. Slacken belt by turning the tensioning pulley (a/f 24) clockwise, hold still and simultaneously take the drive belt off the belt pulley of the air-conditioning compressor. Carefully allow the tensioning roller to turn back into tensioning position.
      Fig 4: Identifying Drive Belt Of Air-Conditioning Compressor
      G03114525Courtesy of PORSCHE OF NORTH AMERICA, INC.
    • b. Disconnect battery positive lead -1-  at B+ disconnection point. Unscrew the hexagon nut M8 and remove the positive lead. Then unscrew the hexagon-head bolt M6 x 12 -2-  at the holder and lay the holder and box to one side.
      Fig 5: Disconnecting Battery Positive Lead & Unscrewing Hexagon-Head Bolt
      G03114526Courtesy of PORSCHE OF NORTH AMERICA, INC.
    • c. Extract Pentosin fluid from the servo-tank with a pump. Dispose of extracted Pentosin according to the relevant regulations. Lay a cloth under the tank to collect any emerging Pentosin. Open the bayonet lock anti-clockwise and remove the tank.

      Immediately seal the lower tank opening with a plug (approx. 30mm).

      Fig 6: Opening Bayonet Lock Anti-Clockwise And Removing Tank
      G03114527Courtesy of PORSCHE OF NORTH AMERICA, INC.
      NOTE: After removal, place the air-conditioning compressor on a suitable protective support (for example, foam, neoprene).
    • Remove the air-conditioning compressor. Tool recommendation: 1/4 inch. Refer to - Fig 9  -  . 3 hexagon-head bolts M8: Unscrew 2 bolts at rear -1-  , 1 at front -2-  . For better access to the front threaded part -2-  , remove the engine compartment temperature sensor with the rubber sleeve at the right intake distributor.
      Fig 7: Removing Air-Conditioning Compressor Bolts
      G03114528Courtesy of PORSCHE OF NORTH AMERICA, INC.

      Front threaded part, air-conditioning compressor 

      Fig 8: Locating Air-Conditioning Compressor Front Threaded Part Bolt
      G03114529Courtesy of PORSCHE OF NORTH AMERICA, INC.

      Fig 9  : recommended 1/4 inch tool for the front compressor screw 

      Fig 9: Identifying Recommended 1/4 Inch Tool For Front Compressor Screw
      G03114530Courtesy of PORSCHE OF NORTH AMERICA, INC.
    • e. Lift out air-conditioning compressor with connected leads. To do so, pull up the front fastening screw in the aluminum spacer sleeve and hold it tight. Disconnect the ground cable from the plug connection and lay it to one side on a protective support. Also secure against falling down (tie wraps).
  11. Remove hose from the secondary pump -4-  .
    Fig 10: Removing Hose From Secondary Pump
    G03114531Courtesy of PORSCHE OF NORTH AMERICA, INC.
  12. Remove generator.
  13. Remove the cable plug of the knock sensor (cylinder bank 1 - 3) -1-  and unscrew the M8 hexagon-head bolt of the knock sensor -2-  ; then remove the knock sensor. Unscrew the air line union nut (hexagon a/f 22) -3-  on the distributor housing.
    Fig 11: Removing Cable Plug Of Knock Sensor
    G03114532Courtesy of PORSCHE OF NORTH AMERICA, INC.
  14. Remove cable plug of the oil level sender and remove the aluminum spacer sleeve -2-  . Unscrew 2 M6x 16 hexagon-head bolts -1-  for the air line on cylinder head 4-6, remove air line and metal seal.
    Fig 12: Removing Cable Plug Of Oil Level Sender And Removing Aluminum Spacer Sleeve
    G03114533Courtesy of PORSCHE OF NORTH AMERICA, INC.
  15. On cylinder bank 1 - 3, remove the wire retainer from the intake pipe -3-  by unclipping the wiring harness and unscrewing the M6 hexagon-head bolt.

    Disconnect vacuum line from the anti-run-on valve -1-  . Using spring-band pliers, remove the clamp from the hose to the secondary air pump -2-  and pull off the hose.

    Fig 13: Removing Wire Retainer From Intake Pipe & Disconnecting Vacuum Line From Anti-Run-On Valve
    G03114534Courtesy of PORSCHE OF NORTH AMERICA, INC.
  16. Undo the screw on the vacuum reservoir with a crosshead screwdriver -arrow-  and press the vacuum reservoir to the rear.
    Fig 14: Undoing Screw On Vacuum Reservoir
    G03114535Courtesy of PORSCHE OF NORTH AMERICA, INC.
  17. Unscrew the 2 M6 x 20 hexagon-head bolts for the distributor housing on the cylinder head 1 - 3. Unclip switch-over valve on distributor housing. Remove distributor housing with check valve from the engine.
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