Vacuum Regulator
NOTE:
Curb idle speed and injection pump linkage adjustments must be set to specifications before EGR vacuum regulator linkage adjustment can be performed.
- Install Vacuum Regulator Adjustment Key (T84P 7B200 A) on throttle linkage, making sure slot in key fits over boss on injection pump. See Fig 1 .
- Disconnect vacuum hose "A" from vacuum pump at vacuum regulator port. SeeFig 2 . Connect vacuum tester to port. Remove vacuum hose "B" from vacuum regulator to EGR valve. Connect vacuum gauge to port.
- Apply and maintain a minimum vacuum of 16 in. Hg at vacuum regulator inlet port. Observe vacuum gauge. Vacuum gauge should read 10.8 in. Hg.
- If vacuum is not within specifications, loosen lock nuts on vacuum regulator link and adjust link until vacuum is within specifications. Tighten lock nuts. Remove vacuum tester and vacuum gauge. Connect vacuum hoses to vacuum regulator.