48981900 Removing and installing hydraulic pump (Cayenne V6)
WM 489819 Removing and installing hydraulic pump (Cayenne V6)
Tools
Technical values
General
Information
- The rack-and-pinion steering gear and power-steering pump must not be repaired or dismantled.
- Always replace the O-rings on hydraulic lines.
- Ensure absolute cleanliness at all times.
- The reservoir must always be replaced if individual or multiple components, such as the tandem pump, PDCC valve blocks (FA/RA), PDCC anti-roll bars (FA/RA) are replaced.
- If system faults still occur after replacing a component (another component is defective), the reservoir does not have to be replaced again.
- Steel flexi-pipes must not be kinked or crushed.
- Observe safety requirements. => 4303AW Safety Requirements for Porsche Dynamic Chassis Control (PDCC)
Position of hydraulic pump on engine
Damage to the power steering will occur if there is a shortage of oil in the hydraulic system. Even small leaks can cause the hydraulic fluid to escape and damage the servo pump as a result of 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.
CAUTION
Increased risk of accidents and material damage if too much Pentosin CHF 202 is filled in or if Pentosin CHF 202 comes into contact with the coolant hoses when filling or topping up.
- It is possible to overfill the system, causing Pentosin CHF 202 to overflow onto coolant hoses and other components.
-> Before checking the fluid level, run the engine for approx. 20 seconds. Multiple steering operations (manoeuvring) will alter the fluid level in the reservoir. Check the fluid level.
-> If coolant hoses come into contact with Pentosin, clean them thoroughly with water IMMEDIATELY.
-> Replace visibly swollen coolant hoses.
Preliminary work
Information
- The engine does not have to be removed in order to remove and install the hydraulic pump.
- The hydraulic pump in the V6 engine is accessible from beneath.
Information
- Before removing the cover of the air cleaner box , the intake manifold must be disengaged from the air cleaner housing.
- Loosen the pulley of the hydraulic pump before removing the drive belt.
Hydraulic pump (pulley removed)
1. Remove the left engine compartment cover. => 700219 Removing and installing front cover (engine compartment) - section on "Removing"
Information
- Before removing the cover of the air cleaner box , the intake manifold must be disengaged from the air cleaner housing.
- Loosen the pulley of the hydraulic pump before removing the drive belt.
2. Disconnect intake manifold at the air cleaner cover. To do this, turn the -pins 180°- and pull them out. Then set the intake manifold aside.
3. Remove air cleaner => 242455 Replacing air-cleaner element - section on "Replacing".
Removing hydraulic pump (Cayenne V6)
Information
- The engine does not have to be removed in order to remove and install the hydraulic pump.
- The hydraulic pump in the V6 engine is accessible from beneath.
1. Loosen pulley of hydraulic pump, but do not remove it.
2. Slacken drive belt and remove from the pulley. => 137819 Removing and installing drive belt - section on "Removing"
3. Raise the vehicle. => 40 Lifting the vehicle
4. Remove engine guard. => 108019 Removing and installing engine guard - section on "Removing".
5. Remove pulley.
6. Remove both lines on the hydraulic pump (suction line, pressure pipe). Close the open connections with suitable plugs. Collect emerging hydraulic fluid in a suitable container.
7. Remove hydraulic pump.
Installing hydraulic pump (Cayenne V6)
Information
- Only use Pentosin CHF 202 to fill the hydraulic system.
- Pay attention to the hydraulic fluid level.
- Replace sealing rings.
- Use correct tightening torques => 4300TW Tightening torques
- Use correct tightening torques => 48 Tightening torques for steering.
1. Fit the hydraulic pump. => Tightening torque: 23 Nm (17 ftlb.)
2. Fit pulley on the hydraulic pump and screw in the screws.
3. Fit drive belt in correct position and tension => 137801 Check drive belt - section on "Checking".
4. Tighten the pulley on hydraulic pump. => Tightening torque: 23 Nm (17 ftlb.)
5. Fit both hydraulic lines. => Tightening torque: 30 Nm (22 ftlb.)+/-3 Nm (+/-2.0 ftlb.) => Tightening torque: 10 Nm (7.5 ftlb.) Remove hose clamp 3094.
Subsequent work
1. Fit air cleaner. => 242455 Replacing air-cleaner element - section on "Replacing"
2. Fit intake manifold on cover for air cleaner housing.
3. Disconnect pressure pipe on the servo oil cooler (line leading to the hydraulic fluid tank). Have a suitable plug ready and close the line (emerging hydraulic fluid.). Collect emerging hydraulic fluid in a suitable container.
4. Fill the hydraulic fluid tank. Use a suitable auxiliary hose (approx. 10 - 15 cm, shop-made) to carry hydraulic fluid that emerges during flushing into a suitable container (approx. 1.5 litres).
5. Flush the hydraulic system with the engine running by turning the steering several times to the right or left stop, and adjust the hydraulic fluid level several times as required. The vehicle must be lowered onto the wheels for this. The tank must not run empty while the engine is running (two workers required).
6. Fit the pressure pipe on the servo oil cooler.
7. Bleed the hydraulic system with the engine running by turning the steering several times to the right or left stop and adjust the hydraulic fluid level several times as required => 48 Testing and assembly work on power steering.
8. Fit engine guard => 108019 Removing and installing engine guard - section on "Installing".