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.