Pas Pump Removal & Inspection - Lotus Evora Service Notes

Lotus Service Notes
2. Check auxiliary drive belt condition and fluid level. With engine idling, turn the steering from lock to lock
several times to raise fluid temperature and check for foaming or emulsification; if necessary, bleed the
system (see Sub-Section HI.3).
3. Remove the banjo bolt connecting the pressure outlet pipe to the PAS pump. Fit the adaptor pipe from
the test kit into the pump, and connect the gauge inlet pipe to the adaptor.
4. Connect the outlet pipe on the gauge to the banjo connector using the union adaptor.
5. Open the gauge valve, and bleed the system of air (see above).
6. With the engine idling, turn the steering from lock to lock several times to raise fluid temperature (70 -
80°C).
7. With the engine idling, close the gauge valve and observe the gauge reading - Do not keep the valve
closed for more than 10 seconds, or excessive oil heating will occur.
Minimum fluid pressure: 7800 to 8300 kPa (1100 to 1200 psi).
8. With the engine idling, open the gauge valve fully and measure the pressure at engine speeds of 1000
and 3000 rpm.
Maximum difference: 490 kPa (70 psi).
9. With the engine idling and the gauge valve fully open, turn the steering to full lock and measure the fluid
pressure. Repeat for the opposite lock - Do not keep on full lock for more than 10 seconds, or exces-
sive oil heating will occur.
Minimum fluid pressure: 7800 to 8300 kPa (1100 to 1200 psi).
10. Disconnect the gauge pipes and refit the banjo union to the pump. Bleed the system of air (see above).
HI.8 - PAS PUMP REMOVAL & INSPECTION
The vane type, constant displacement hydraulic pump is mounted on the right hand front of the cylinder
block, and is driven by the automatically tensioned multi-rib auxiliary belt from the crankshaft pulley. The pump
is secured to the engine by two bolts, access to which requires the removal of the rear clamshell.
1. Remove the rear clamshell (see Sub-Section BV.6).
2. Use a syringe to empty the PAS reservoir of oil and reduce potential spillage.
3. Using a 14mm hexagonal socket, turn the auxilary belt tensioner counterclockwise to relieve tension on
the belt, and insert a 5mm rod through the tensioner hole to secure in that position. Mark the direction of
rotation on the belt before unhooking from the PAS pump pulley.
4. Disconnect the reservoir hose from the pump, and plug both hose and pump port.
5. Disconnect the high pressure feed pipe from the pump, and plug both pipe and pump port.
6. Disconnect the harness from the PAS pump pressure switch.
7. The pump is secured to the engine by two bolts, accessible between the spokes of the pulley. Remove
the lower bolt. Unscrew the upper bolt from its threaded boss, but leave in position whilst withdrawing the
pump from the slotted upper lug.
8. Flow Control Valve:
- Remove the pressure port union and 'O' ring.
- Remover the flow control valve and compression spring.
Section HI
Page 13