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Aircraft Maintenance TroubleShoot > vacuum pump troubleshooting High vacuum pressure. Low vacuum pressureNote: There should be less than 1.5" Hg drop in vacuum/pressure between the pump and gyro instruments in single engine aircraft). The aircraft instrument panel vacuum or pressure gage only measures instrument operating vacuum/pressure, not the pump operating vacuum/pressure. For example, single-engine aircraft is 2 in. Hg. 6.5 in. Hg is only 3.25 psi.1. Kinks or clogs in line. 2. Clogged filters. 3. Oil in system. Leakage from engine drive pad seals may allow oil to enter the pump and generate erratic vacuum or pressure gage indications. 4. Adjust regulator. 5. If gyros function normally, relief valve screen clogged or malfunctioning.
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Aircraft
vacuum pump showing carbon rotor and carbon blades. Any moisture or oil that
gets into the vacuum pump turns the carbon dust into glue and fails the pump. Be
careful when spraying down the engine not to get fluid next to the vacuum pump