Keeping it stock
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Senior User
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Keeping it stock
I have talked with every parts house this side of Baghdad and nobody has any parts for the heat flapper valve on my aircleaner housing. So I have carefully disassembled it pulling the flapper out of the housing and the actuator rod. Now I know how it works, It is not a expandable coil like I originally thought but rather a brass cylinder with a steel rod that serves as a piston and pushes on the flap. This cylinder and rod assembly simply uses ambient air that when expands from heat lengthens the rod. What I have concluded is it is missing a balance spring that pulls against the outer flap retainer spring. The flap should require very little force to move it with the actuator disconnected it should almost float so to speak.
Long story short it will work again with zero parts investment since I have a huge selection of springs on hand.
If anyone is interested I can post photos of the restoration process. We all need to make sure these valves are working because you are loosing a bunch of horse power if you are pulling hot air. Many an aircraft has crashed because the pilot left the carb heat on after a touch and go.
Long story short it will work again with zero parts investment since I have a huge selection of springs on hand.
If anyone is interested I can post photos of the restoration process. We all need to make sure these valves are working because you are loosing a bunch of horse power if you are pulling hot air. Many an aircraft has crashed because the pilot left the carb heat on after a touch and go.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
The flapper valve/spring was not sold separately, it was only furnished with the duct (air cleaner snout).
The duct did not come with the air cleaner, it was only available by itself.
The only part of the duct that was available by itself...was the vacuum motor that activated the flapper.
What year is the truck? What size is the engine?
1967/72 V8: There were three different types. 1967 F100/350 352 (C7TZ9A626C) / 1968/72 F100/350 360/390 (C8WY9A626A-replaced C8AZ9A626B) / 1969/72 F100 302 (C8AZ9A626D).
C8AZ9A626B, C8AZ9A626D & C8WY9A626A were also used on 1968/72 Passenger Cars (LTD/Galaxie/Marquis / Mustang/Cougar / Falcon/Comet/Fairlane/Torino/Montego).
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Senior User
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Which Baghdad might that be? Is it Baghdad by the Bay...aka San Francisco? Or is it Baghdad, Iraq? How about Baghdad CA, a ghost town off Route 66 near Barstow?
The flapper valve/spring was not sold separately, it was only furnished with the duct (air cleaner snout).
The duct did not come with the air cleaner, it was only available by itself.
The only part of the duct that was available by itself...was the vacuum motor that activated the flapper.
What year is the truck? What size is the engine?
1967/72 V8: There were three different types. 1967 F100/350 352 (C7TZ9A626C) / 1968/72 F100/350 360/390 (C8WY9A626A-replaced C8AZ9A626B) / 1969/72 F100 302 (C8AZ9A626D).
C8AZ9A626B, C8AZ9A626D & C8WY9A626A were also used on 1968/72 Passenger Cars (LTD/Galaxie/Marquis / Mustang/Cougar / Falcon/Comet/Fairlane/Torino/Montego).
The flapper valve/spring was not sold separately, it was only furnished with the duct (air cleaner snout).
The duct did not come with the air cleaner, it was only available by itself.
The only part of the duct that was available by itself...was the vacuum motor that activated the flapper.
What year is the truck? What size is the engine?
1967/72 V8: There were three different types. 1967 F100/350 352 (C7TZ9A626C) / 1968/72 F100/350 360/390 (C8WY9A626A-replaced C8AZ9A626B) / 1969/72 F100 302 (C8AZ9A626D).
C8AZ9A626B, C8AZ9A626D & C8WY9A626A were also used on 1968/72 Passenger Cars (LTD/Galaxie/Marquis / Mustang/Cougar / Falcon/Comet/Fairlane/Torino/Montego).
It has no vacuum motor to actuate the flapper That is the one with the little round can on top and vacuum hose mine has no hose.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
Fits: 1969/72 F100 302 / 1968 Galaxie/LTD/Fairlane/Torino/Falcon/Comet/Montego/Mustang/Cougar 289 / 1969/71 same vehicles with a 302.
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Senior User
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Thanks man
I think I can get it serviceable again with no trouble. It is so simple that it's a wonder why someone does not make a replacement. All the parts with the exception of the hydrofromed duct could be made with average machine tools. Oh well I guess everyone wants a shiny chrome no heat filter. Me I like two things in the morning "coffee and carb heat".
I think I can get it serviceable again with no trouble. It is so simple that it's a wonder why someone does not make a replacement. All the parts with the exception of the hydrofromed duct could be made with average machine tools. Oh well I guess everyone wants a shiny chrome no heat filter. Me I like two things in the morning "coffee and carb heat".
