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Author Topic: APT adjustment  (Read 3281 times)

Offline springl

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APT adjustment
« on: January 16, 2016, 05:10:58 PM »
Hi All. I have rebuilt my 17085212 Q jet with the help of Cliff's book and kit. I removed the plug above the APT adjustment so I could do the adjustment without disassembling the carb. I found that the APT adjustment access hole also contains an adjustable stop for the full rich position of the metering rods. I haven't found anything that could be screwed into the threads to plug the hole and lock the full rich adjustment. I am also wondering if the full rich adjustment could be set. I have an wideband A/F meter installed so I could tell what affect any changes would make. Check the included picture.
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Offline blazer74

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Re: APT adjustment
« Reply #1 on: January 17, 2016, 09:17:57 PM »
Remove it and install Allen plug
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Offline springl

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Re: APT adjustment
« Reply #2 on: January 18, 2016, 10:28:10 AM »
I have not been able to find anything with the proper threads to screw into the carb. Have you actually plugged the hole successfully and if so what did you use?
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Offline Ethan1

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Re: APT adjustment
« Reply #3 on: January 18, 2016, 04:09:07 PM »
 What about tapping it with a 3/8"-24 taper tap and using an allen head plug?
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Ethan

1972 Chevelle

(oo______oo)

Offline blazer74

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Re: APT adjustment
« Reply #4 on: January 18, 2016, 04:43:16 PM »
Already tapped, should be 3/8 24 plug, idk if it's metric. Don't think so.
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Offline Cliff Ruggles

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Re: APT adjustment
« Reply #5 on: January 19, 2016, 03:59:24 AM »
I always use the original parts on those carburetors.

I use a fine hacksaw blade to slot the aluminum plug, and drive it back in the threaded metal collar, and it works fine.....Cliff
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