Porsche 911 Maintenance Service

Replacing the High-Pressure Power Steering Hose

If you notice an oil stain near the rocker cover on the right side, below the power steering pump, there is a good chance that the high-pressure power steering hose is porous and leaking.

Figure 2.1 — Removed high-pressure power steering hose, with its two fittings.
Figure 1 — Removed high-pressure power steering hose, with its two fittings.

Overview

If you notice an oil stain near the rocker cover on the right side, below the power steering pump, there is a good chance that the high-pressure power steering hose is porous and leaking.

Figure 2.2 — Air filter housing, retaining clips, and intake manifold shown in red.
Figure 2 — Air filter housing, retaining clips, and intake horn marked in red.

Explanation

After removing the air filter — which is held in place by four clips — and the engine oil filler cap, it becomes easier to access the hose. Work on the engine while it is cold, and clean the area before opening the system.

Figure 2.3 — Mounting screws for the air intake and air filter housing, marked before removal.
Figure 3 — Mounting screws for the air intake and air filter housing, marked before removal.

Explanation

Next, remove the plastic cone located on the air intake, then unscrew the four screws around the intake, and finally the two Nylstop nuts that secure the housing to two silent blocks. Lift the assembly out from the bottom. You now have access to the rear end of the hose; the other end is attached to the pump.

Figure 2.4 — Power steering fluid reservoir and filler cap.
Figure 4 — Power steering fluid reservoir and filler cap.

Explanation

Don't forget to drain the reservoir — the glass jar — of the power steering pump, located next to the engine oil filler cap. This is easy to do with an oil syringe.

Figure 2.5 — Low-pressure hose clamp and high-pressure hose fitting on the pump.
Figure 5 — Low-pressure hose clamp and high-pressure hose fitting on the pump.

Explanation

Loosen the Serflex clamp — circled in red in the photo — and then remove the hose to access the high-pressure hose mounting nut, which is also circled in red.

Figure 2.6 — Hose retainer on the rear deck, indicated by the arrow.
Figure 6 — Hose retainer on the rear deck, indicated by the arrow.

Explanation

After loosening the nut on the high-pressure hose, remove the plastic clip that secures the lower part of the hose to the rear fender — see the red arrow — and then loosen the fitting at its end.

Note: Reassemble in reverse order using the specified gaskets, fill and bleed the system according to the vehicle’s manual, and then check for leaks with the engine running.

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