Detail Steps/Work Items Key Items/References
(1) Remove the engine cowlings. Refer to Section 71-11.
WARNING: IF THE ENGINE HAS BEEN RUNNING, TAKE CARE WHEN YOU TOUCH THE HEAT VALVE. THE HEAT VALVE GETS HOT.
(2) Release the worm drive clamp which holds the flexible hose to the heat valve. Then disconnect the hose from the valve.
(3) Set the CABIN HEAT control lever to ON.
(4) Loosen the screw which holds the control cable to the swivel fitting in the heat valve. Access through the front of the valve.
(5) Remove 4 nuts and washers which attach the heat valve to the firewall.
(6) Remove the heat valve from the firewall.
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Heat Valve
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Instrument Panel Cover
Defrost Hose
Heat Valve Control Cable
Heat Valve Control
Cable Lock-Nut
Firewall
Heat Valve Attaching Nut and Washer
Heat Exchanger
Distributor Valve
Control Cable
Swivel Fitting
Defrost
Hose
Hot Air Hose to Passenger Footwells Cable Binder
Washer
Attaching Bolt
Floor Panel
Distributor Valve
Heat Valve Attaching Bolt (Bonded in)
Hot Air Hose from Heat Exchanger
% To/From Engine Cooling System
% % % Figure 3: Heat Valve and Distributor Valve Installation.
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% B. Install the Heat Valve %
Detail Steps/Work Items Key Items/References
(1) Examine the copper seal between the distributor valve and the firewall. Replace defective seal. Use self-adhesive copper tape.
(2) Put the heat valve in position on the firewall. Apply fire resistant sealant. Use PR 812 or equivalent.
(3) Install the 4 washers and nuts which attach the heat valve to the firewall.
(4) Set the CABIN HEAT control lever to ON. Then move it up about 3 mm (1/8 in).
(5) Attach the control cable: S Put the control cable through the hole in the swivel fitting. S Make sure that the flap is hard against the right side of the valve. S Tighten the screw in the swivel fitting.
(6) Do a test for correct operation of the heat valve. Refer to Paragraph 3.
(7) Connect the flexible hose to the heat valve. Tighten the worm drive clamp.
(8) Install the engine cowlings. Refer to Section 71-11.
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% 3. Test/Adjust the Heat Valve
% WARNING: MAKE SURE THAT THE FLAP ON THE HEAT VALVE FULLY CLOSES % THE FIREWALL OUTLET WHEN YOU SET THE CABIN HEAT % CONTROL LEVER TO 'OFF'. THIS IS TO STOP FIRE OR EXHAUST % FUMES FROM GOING INTO THE COCKPIT IN AN EMERGENCY.
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