Ranger 4WD V6-182 3.0L (1994)
Vacuum Diaphragm: Testing and Inspection
OFF VEHICLE TEST
1. Remove unit from transmission and, using suitable vacuum tester, adjust tester until vacuum gauge reads 18 inches with end of vacuum hose
blocked off.
2. Connect vacuum hose to manifold vacuum port.
3. If gauge still reads 18 inches, vacuum unit diaphragm is not leaking.
4. A second leakage check can be made as the hose is removed from the transmission vacuum unit.
5. Hold a finger over the end of the vacuum control rod.
6. When the hose is removed the internal spring of the vacuum unit should push the control rod outward.
7. If the vacuum diaphragm needs replacing, install a new unit that has been released for service.
ON VEHICLE TEST
1. Start the vacuum pump and set the regulator knob so that the vacuum gauge reads 18 inches with the end of the vacuum hose blocked off, then
connect the vacuum hose to the diaphragm unit.
2. If the gauge still reads 18 inches, the vacuum diaphragm unit is not leaking.
