2.
Slide spring, gasket and lock over back of key lock.

3.
Reinstall nut which secures key lock to cover.

4.
Attach pawl to back of lock assembly with screw previously removed.

– Note – Apply Loctite 271 to thread of two screws previously removed from back of fuel cap.

5.
Install screws in back of fuel cap.

28-10-00 Page 28-17 Issued: April 1, 1997
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28-10-00 Page 28-18 Issued: April 1, 1997
DISTRIBUTION.
FUEL FILTER. (refer to Figure 28-4.) — Note — The fuel filter should be inspected at periodic intervals as explained in Chapter 12, Servicing Fuel System.
REMOVAL OF FUEL FILTER.
1.  
Determine that the fuel selector valve lever is in the off position. Remove scoop and screen from bottom of fuselage to gain access to the fuel filter.

2.  
Drain remaining fuel from fuel filter by opening drain valve located on the side of the fuselage just forward of the entrance step.

3.  
Cut safety wire and remove acorn nut, remove bowl, safety nut and screen assembly.

CLEANING FUEL FILTER.
1.  
Clean screen assembly and bowl thoroughly using acetone or other suitable dry type cleaning solvent. Dry using a light blast of compressed air. Replace screen if any signs of damage or deterioration are evident.

2.  
Discard gasket and replace it with a new one at reassembly.

REASSEMBLY OF FUEL FILTER.
1.  
Replace screen assembly and nuts, install new gasket on top of bowl assembly. Carefully insert bowl, and replace washer and nut.

2.  
Safety nut to adjacent elbow.

3.  
Determine that the drain valve on the side of the fuselage is closed and place the fuel selector valve lever in the desired position. Replace screen and scoop on bottom of fuselage.

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28-20-00 Page 28-19 Issued: April 1, 1997

FUEL SELECTOR VALVE.
REMOVAL OF FUEL SELECTOR VALVE.
1.  The fuel selector valve need not be removed unless any of the following conditions exist:
A. Failure of selector lever to seat in detent.
B. Signs of leakage.
C. Difficulty in moving fuel selector lever.
2.  
In the event it is necessary to remove the fuel selector valve, remove rear seat and floor.

3.  
Drain appropriate fuel tank. (Refer to Draining Fuel Tank, Chapter 12.)

4.  
Disconnect control cable from valve selector lever. Disconnect fuel lines and mounting hardware and remove fuel selector valve.

— Note —
Except for replacement of O-rings, the fuel selector valve should be overhauled only when necessary.
Color coding the selector lever and control cable ends is the recommeneded method of ensuring correct reassembly.
28-20-00 Page 28-20 Issued: April 1, 1997

DISASSEMBLY OF SELECTOR VALVE. (Refer to Figure 28-5)
1.  
Remove the four screws and washers that attach the cap assembly to the valve body.

2.  
Pull the cap assembly straight from the valve body.

3.  
Push the spool from the valve body.

4.  
To disassemble the cap assembly, remove the roll pin that secures the gear on its shaft by driving the pin with a 3/32 straight drift punch.

5.  
Remove the gear and spacer from the shaft.

6.  
Remove the four screws that secure the packing and seal cover. Remove the cover.

7.  
Remove old O-rings and seal.

8.  
If fitting is removed, replace O-ring packing.

CLEANING, INSPECTION AND REPAIR OF SELECTOR VALVE.
1.  
Clean the valve components in a dry cleaning solvent.

2.  
Inspect the valve for the following:

A. Check that the friction surfaces of the valve are free from nicks, dents and burrs.
B. Check that the teeth of the gear and spool are not damaged.
C. Check that the threaded surfaces are not stripped or cross-threaded.
D. Check that the selector detent mechanism is operating properly.
28-20-00 Page 28-21 Issued: April 1, 1997
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.
— Note —
Fittings in the valve are special. Do Not use AN fittings.
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.
　
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