VACUUM REGULATOR VALVE
A vacuum regulator valve is incorporated in the system to control vacuum pressure to gyro instruments.
The regulator valve is located under the instrument panel.
ADJUSTMENT OF VACUUM REGULATOR VALVE
1. Loosen locking nut or remove protective cap from valve, depending on which type is installed.
—WARNING—
Do not attempt adjustment of this valve with engine in operation,
without a qualified pilot or other responsible person at the
controls.
2. Start engine. After allowing time for warm-up, run engine at medium rpm.
3. Suction gauge should indicate 5.0 inches of mercury ±0.2 inches of mercury. If pressure reading is not
within this range, shut down engine and adjust regulator valve as follows:
a. Move valve adjustment screw clockwise to increase pressure.
b. Turn screw counterclockwise to decrease pressure.
c. If airplane is not equipped with a suction gauge, it is necessary to connect a gauge by removing
plug from back of artificial horizon, and attaching a temporary gauge.
4. Start engine and repeat check.
5. After system pressure has been adjusted, remove gauge, install plug, and replace protective cap or
locknut, whichever applies to type valve installed.
REMOVAL AND REPLACEMENT OF REGULATOR VALVE
Remove regulator valve as follows:
l. Disconnect three lines.
2. Remove mounting nut.
3. Remove valve from airplane.
Install regulator valve as follows:
1. Position valve in airplane.
2. Tighten mounting nut.
3. Connect and tighten three lines to valve
4. Check complete vacuum system for proper operation.
37 - 13 - 00
Page 37 - 07
Reissued: August 1, 1986
2E9
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
To Next Page
Loading...
