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Pressure Test

CAUTION: Do not hold valve closed for more than 5 seconds as pump damage may result.
  1. Pump flow and pressure tests are conducted using a flow/pressure analyzer (14-0207) to determine system back pressure, pump flow and internal leakage in steering gear, control valve and cylinder.
  2. Prior to making these tests, make sure that tire pressure, belt tension and fluid levels are correct. Check entire system for damage. Check pulley size and pump model for proper application.
  3. Reservoir must be kept full and at normal operating temperature during testing. Attach tester between pressure line and pump with gauge between pump and tester valve. Start engine and let idle for 2 minutes.
  4. With engine idling and fluid hot, record pressure (with tester valve open) and flow. If flow is below minimum listed in chart, pump may require service. However, proceed with testing at this point.
  5. If pressure is above idle specification listed in chart, check hoses for restrictions. Partially close tester valve to build up 740 psi (52 kg/cm2 ) and record flow. If flow is below minimum, pump cam pack requires replacement. Proceed with testing.
  6. Completely close and partially open tester valve 3 times, do not allow tester valve to remain closed for more than 5 seconds. Observe and record pressure each time valve is closed.
  7. If readings vary more than 50 psi (3.5 kg/cm2 ), flow control valve may be sticking. If pressure is lower than minimum specification, replace flow control valve. If pressure is above maximum specification, remove flow control valve and clean or replace as necessary.
  8. Increase engine speed to about 1500 RPM. With valve all the way open, observe and record flow. If flow exceeds maximum free flow listed in chart, remove flow control valve and clean or replace as necessary.
  9. Return engine to idle speed. Turn steering wheel to left and right stops. Observe and record flow at both stops. Pressure readings should be at or near maximum pressure specification listed in chart.
  10. Flow should drop below .5 Gallons Per Minute (GPM). If pressure does not reach maximum or if flow does not drop below .5 GPM, excessive internal leakage of steering gear is occurring.
POWER STEERING PRESSURE & FLOW SPECIFICATION

Application  Pressure (psi) Idle  Pressure (psi) Relief  Flow (gpm) Min.  Flow (gpm) Max. 
1.6L All Models 150 750-950 1.10 2.20
2.3L All Models 150 850-1130 1.30 2.60
3.8L LTD/Marquis 150 950-1230 1.25 2.60
3.3L All Models 150 950-1230 1.25 2.60
3.8L LTD, Marquis 150 950-1230 1.40 2.60
3.8L All Others 150 950-1230 1.20 2.60
5.0L Continental 150 1100-1380 1.60 2.60
5.0L Capri, Mustang 150 850-1230 1.35 2.60
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