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Home >> Ford >> 2002 >> Taurus SES, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 1015 (Four-Wheel Drive Systems (ESOF) - Excursion & F250-F550 Super Duty) >> General Procedures >> Hublock Vacuum System Leak Test

Hublock Vacuum System Leak Test

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: This procedure requires the use of a calibrated vacuum gauge that is accurate to within a minimum of 0.1 in-Hg. It is recommended the Pressure Vacuum Module 105-R0.099 or equivalent be used.
  1. Make sure hublocks are in the AUTO position.
  2. Lift and support the vehicle off the ground until the front tires can be spun freely. Refer to JACKING & LIFTING .
  3. Start the engine and allow to idle.
    NOTE: The engine is required to be at idle during the following steps to supply the vacuum required for the hublocks to engage and disengage.
  4. Turn the mode select switch (MSS) to the 2WD position and wait 15 seconds. If switching from 4X4 mode, wait an additional 45 seconds.
  5. Disconnect the vacuum line at the right front knuckle and install a vacuum gauge on the line.
    Fig 1: Disconnecting Vacuum Line At Right Front Knuckle
    G01554067Courtesy of FORD MOTOR CO.
  6. Disconnect the vacuum line at the left front knuckle and plug the line.
    Fig 2: Disconnecting Vacuum Line At Left Front Knuckle And Plug Line
    G01554068Courtesy of FORD MOTOR CO.
  7. Turn the MSS to 4X4 and observe the vacuum reading. The vacuum reading should remain at or above 10 in-Hg for 45 seconds.
    NOTE: Normal operation applies engagement vacuum for 45 seconds and then drops to 0 in-Hg.
  8. Turn the MSS to 2WD and observe the vacuum reading. The vacuum reading should remain between 5.8 and 7.3 in-Hg for 15 seconds.
    NOTE: Normal operation applies regulated disengagement vacuum for 15 seconds and then drops to 0 in-Hg.
  9. Remove the vacuum gauge and connect the vacuum line at the right front knuckle.
  10. Turn the MSS to 4X4.
  11. Wait one minute then rotate the right front tire one revolution forward and one revolution backward while observing the right front axle shaft and universal joint.
    NOTE: The right front axle shaft and universal joint should turn.
  12. Turn the MSS to 2WD.
  13. Wait one minute then rotate the right front tire one revolution forward and one revolution backward while observing the right front axle shaft and universal joint.
    NOTE: The right front axle shaft and universal joint should not turn.
  14. Install the vacuum pump and gauge line on the knuckle and pump to 20 in-Hg.
    Fig 3: Installing Vacuum Pump And Gauge Line On Knuckle And Pump
    G01554069Courtesy of FORD MOTOR CO.
  15. If vacuum drop is less than 0.5 in-Hg in 30 seconds install a new hublock with a new O-ring seal kit. Refer to HUBLOCK .
  16. If vacuum drop is greater than 0.5 in-Hg in 30 seconds install a new INSTALL a new hublock. Refer to HUBLOCK .
  17. Repeat steps 1 through 13 for the LH hublock. If results are not as indicated, GO to PINPOINT TEST G  for further diagnosis of the hublock system.
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