Power steering pump

POWER STEERING PUMP

REMOVAL/REFITTING

• Empty the oil from the power steering reservoir, using a suitable syringe.

1. Disconnect the oil inlet and outlet hoses from the power steering pump.
2. Slacken the two bolts fastening the power steering pump and remove it from the drive belt.
3. Slacken completely the two fastening bolts and remove the power steering pump.

48 ÷ 53 Nm
4.8 ÷ 5.4 kgm

CHECKS AND INSPECTIONS

WARNING:
The power steering pump, like the steering box, should not be dis-assembled for any reason whatsoever and must be sent to the Manufacturer for overhauling.

• Check the rolling torque of the steering wheel with the car stationary and the engine running. The torque must be between 0.6 daN with the engine at idle speed and 0.75 daN with the engine at maximum: if these limits are exceede check the pressure in the system with the wheels completely turned. Insert a pressure gauge using a suitable Tee connection on the pressurised oil delivery hose leading from the pump to the power steering and turn the steering wheel fully in one direction. Further forcing the steering wheel, the pressure indicated on the pressure gauge should rise to appr. 85 bar. If this fails to happen, there is either a failure in the pump or in the distributing valve of the power steering box.

REFILLING THE POWER STEERING CIRCUIT AND BLEEDING THE AIR

1. Disconnect the reservoir breather pipe.

WARNING:
The power steering system is self-purging; the air is removed steering completely to the right and to the left with the engine running and the car stationary. This operation should be carried out each time the connection hoses are removed and refitted.

• Completely insert the breather pipe and refit the reservoir cover.

Stiffening of the steering might be due to slipping of the pump drive belt or to low oil level. In the event of a failure to the pump, operating cylinder or distributing valve, the power steering system will work like a normal mechanical gearbox.

1. Disconnect the inlet hose on the power steering pump until oil flows out, then re-connect it.

2. Remove the cap and fill the reservoir with the specified oil.