Selector Valve Assembly; Selector Valve Leak Test - Piper PA-44-180 SEMINOLE Maintenance Manual

3. Repair to the valve is limited to reconditioning of parts, such as smoothing out minor nicks and scratches.
and the replacing of O-ring packings and seal.
ASSEMBLY OF SELECTOR VALVE. (Refer to Figure 28-5.)
1. If either fitting was removed. install the O-ring packing and assemble the fitting on the valve body.
2. Lubricate the O-ring packings with a thin coat of stop-lock grease and install on the valve spool.
3. Insert and center the spool in the valve body.
4. Lubricate the seal and O-ring, and install in the cap assembly.
5. Ascertain that the shaft is in place and install cover. Secure with screws.
6. Slide the spacer and gear on the shaft, with the pinholes aligned so that the gear teeth are opposite the
selector lever. Secure the gear with roll pin.
7. Install the O-ring packing on the cap assembly.
8. Place the selector handle in neutral in relation to the cap and install the cap assembly in the valve body.
Secure the cap assembly with screws and washers.
9. Check valve operation.
LEAK TEST OF SELECTOR VALVE.
1. Connect the inlet port of the valve assembly to a 25 psi air source.
2. Plug the right hand port and close the left hand port by placing the control lever to the right.
3. Apply pressure to 25 psi. There shall be no evidence of leakage either through the port or around the fitting
and lever when submerged in kerosene or a similar petroleum base fluid for 30 seconds.
4. Depressurize, remove the plug from the right hand port, place on left hand port and close right hand port by
placing the lever to left.
5. Repeat Step 3.
6. Disconnect and wipe fluid from exterior.
CLEANING FUEL SYSTEM.
1. To flush fuel cell and selector valve, disconnect the fuel line from the carburetor.
2. Select a fuel cell, turn on the electric pump and flush fuel through the system until the tank is empty.
Agitation of the fuel within the cell during this operation will help pick up and remove dirt and other foreign
matter from the fuel cell and selector valve.
3. Repeat this procedure for each fuel cell.
4. When both cells are flushed, clean gascolator and fuel tank finger screens.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— Note —
Fittings m valve are special. Do Not use AN fittings.
2B13
2 8 - 2 3 - 0 0
Page 28-18
Revised: May 15, 1989