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Pressure Test

  1. Start engine and idle for approximately 2 minutes. Record flow. Flow should be approximately 2.6 gals. (9.8L) per minute, pump may require repair. Continue test.
  2. If pressure is greater than 150 psi (10.5 kg/cm2 ), check hoses for restrictions. Partially close valve to build up pressure to 740 psi (52 kg/cm2 ) and check flow. Flow should be approximately .95 gal. (3.4L) per minute.
  3. If flow drops below specification, disassemble pump and replace cam pack. Inspect pressure plate for cracks or wear. Replace as necessary. Completely close and partially open gate valve 3 times. Do not close valve for more than 5 seconds. Record highest reading each time. If pressure is higher or lower than specified, repair or replace flow control valve. Refer to PRESSURE/FLOW TEST SPECIFICATIONS  .
    PRESSURE/FLOW TEST SPECIFICATIONS

    Application Min. Flow (1) Gal/Min. (Liter/Min.) Relief Pressure psi (kg/cm2 )
    Ford C-II Pump .95 (3.4) 1400-1530 (98-107)
    (1) Partially close gate valve until pressure reaches 740 psi. (52 kg/cm2 ) and record reading.
  4. Increase engine speed to 1500 RPM. Record flow. If flow varies more than one gal. (3.8L) per minute from pressure measured in step 1), repair or replace flow control valve in pump.
  5. Turn steering wheel to left and right stops. Pressure should be nearly the same as maximum relief pressure. Flow should drop below .5 gal. (1.9L) per minute.
  6. If pressure and flow are not as specified, steering gear is leaking internally. Remove steering gear. Remove flow control valve. Repair or replace damaged parts. Check rack piston and valve seals for damage.
  7. If pressure and flow are good, turn steering wheel slightly in both directions and release quickly while watching pressure gauge. Needle should move from normal backpressure reading and snap back as wheel is released.
  8. If gauge reacts slowly, or sticks, rotary valve in steering gear is sticking. Repair or replace rotary valve.
  9. If system is severely contaminated, disassemble and clean both hoses, control valve and pump. If problem still exists, check ball joints, linkage and other front suspension components.
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