F 250 2WD Pickup V8-7.3L DSL (1990)
Vacuum Diaphragm: Testing and Inspection
VACUUM DIAPHRAGM CHECK
NOTE: To check the vacuum diaphragm for leakage, remove the unit from transmission.
1. Using a distributor tester equipped with a vacuum pump, set regulator knob so that vacuum gauge reads 18 in Hg with end of the vacuum hose
blocked off.
2. If the diaphragm holds 18 in Hg of vacuum, the vacuum diaphragm is not leaking.
