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Ford 9N, 2N & 8N Discussion Forum
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Carb Re-assembly

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AustinAl

05-15-2007 08:34:58




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OK, I admit it. Made the big mistake of not paying attention on one step of disassembly during a TSX 241 carb rebuild for my 8N. Now I am reassembling and want to make sure I do it right.

My rebuild kit had a replacement shaft and spring for the choke. The choke plate has a spring loaded semicircle part which apparently opens slightly in the closed position, letting air in.

When I reassemble this plate to the shaft, I need to make sure I am putting it back correctly. With the carb in the upright normal position, and the air inlet facing right, does the plate go in with the semicircle opening above the shaft or below the shaft? I assume that the plate is inserted so that when the spring loaded part opens slightly, it opens in the direction of the carb and not the air inlet side?

Appreciate any help here, of if I need to clarify to make this question easier to understand, left me know what you need to know.

One other question about the rebuild. My rebuild kit has a felt washer aout 1/8" thick and 3/8" in diameter that looks like it is sized to go around the throttle shaft. The instructions on the rebuild kit are miserable, don't even mention this. I saw no evidence that this was used on my carb. I have the great article written by Don Stewart on the 8N rebuild, and nowhere does he mention it either. Can I assume that this is not used for the 8N carb rebuild?

Thnaks for the help....

Thanks

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Plucky-the-tractor-boy

05-15-2007 10:47:49




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 Re: Carb Re-assembly in reply to AustinAl, 05-15-2007 08:34:58  
AustinAl,

The spring loaded flap does indeed open towards the carb and is above the throttle shaft.

As for the felt washer, it does go around the throttle shaft next to where the shaft enters to the carb body. There is also a rubber seal in these carb kits. There really is no magic to these parts except you must prevent air from entering the carb at this location and the choke shaft as well. I have done done three of these carb rebuilds and the only one that really made a difference is the last one where I made this a priority. Any washer, homemade or otherwise, will help. Pack it tight as you can, without hindering the freedom of movement.

Hope this helps,
Plucky

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Dell (WA)

05-15-2007 10:33:02




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 Re: Carb Re-assembly in reply to AustinAl, 05-15-2007 08:34:58  
Austin..... ..there should have been a black neoprene washer/seal for the THROTTLE shaft. Install with wedgie side OUT. (look close) You want that flexible seal to prevent INCOMING air from upsetting the carb idle adjustments.

The dirtywhite FELT washer/seal (usually behind a washer, look) is for the CHOKE shaft where yer puttzin'round with the clock-spring. Install the clock-spring to HOLD-OPEN yer choke. So when you pull yer choke-knob and let go, it will spring-load pop OPEN.

You write..... ."The choke plate has a spring loaded semicircle part which apparently opens slightly in the closed position, letting air in.

When I reassemble this plate to the shaft, I need to make sure I am putting it back correctly. With the carb in the upright normal position, and the air inlet facing right, does the plate go in with the semicircle opening above the shaft or below the shaft? I assume that the plate is inserted so that when the spring loaded part opens slightly, it opens in the direction of the carb and not the air inlet side?"

yep, that choke flapper valve is TOPSIDE of choke shaft and SUCKS-IN to the engine. The choke flapper valve should be spring-loaded tight. (butt it don't matter much)

The choke flapper valve is to prevent the "strangler" (choke) from fully sealing the carb throat and FLOODING the engine when cranking. Modern carbs have specifications for choke air-gap (usually a drillbit as feeler gauge) which does the same thing, prevent flooding..... ...Dell, who agrees, carb rebuild instructions suck and carb drawings LIE

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