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#1
06-07-2016, 12:09 PM
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Qjet Accelerator Pump Partition Broken
I've heard talk of a repair for the accelerator pump linkage partition ( the pin goes through it) and was wondering if someone can share what they've done. I have an 800 CFM Buick carb that I acquired because of this. It was freshly rebuilt and it happened on install.
It is the outer partition that is broke off flush. Any help is appreciated Joe
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The More People I Meet, The More I Love My Dogs! |
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#2
06-07-2016, 12:13 PM
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I have a friend that bought a q-jet from SMI, Sean Murphy Induction and it had been repaired there. Give him a call and see if he can help you.
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1971 Base Firebird..505ci IA 2A Round port E-heads by Butler 348 cfm.. Comp street SR 266/272@.050 Victor intake/Quick Fuel Q950. 1 7/8" Dougs headers..3" mandrel bent exhaust with Hooker Max Flow mufflers, T-350 well built with 10" 4000 stall nitrous Continental converter..3.73 posi . Caltracs and 10" slicks. Belt driven water pump, alternator, Pwr steering and brakes,Flex fan. 11:1compression, straight 93 octane pump fuel. 10.35 @ 129.88 with 1.45 60ft N/A at 3700lbs race weight. |
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#3
06-07-2016, 12:23 PM
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Shaker455 did a great job on mine.
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#4
06-07-2016, 12:56 PM
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Quote:
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The More People I Meet, The More I Love My Dogs! |
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#5
06-07-2016, 01:04 PM
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My mind says something like this is the fix minus the step.
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The More People I Meet, The More I Love My Dogs! |
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#6
06-07-2016, 03:08 PM
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https://www.dropbox.com/s/6eafqo1i5p...15704.jpg?dl=0
https://www.dropbox.com/s/hvf1bc90ux...15642.jpg?dl=0 |
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#7
06-07-2016, 03:27 PM
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Quote:
Is that brazed on? Thanks for the pics.
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The More People I Meet, The More I Love My Dogs! |
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#8
06-07-2016, 04:06 PM
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I've fixed a few by fabing a little 'L' shaped bracket out of .050" stainless steel.
I leave the bottom long enough for the mounting bolt to go through. Then inbetween the mounting bolt and 'L' put two small screws (taper headed and counter sunk) through the bracket into the top of the carburetor. Not hard to do and looks pretty neat when you trim the edges of the bracket to fit the top of the carburetor just right.
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All the federales say,they could've had him any day They only let him slip away, out of kindness...I suppose Poncho & Lefty |
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#9
06-07-2016, 05:06 PM
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Quote:
We offer that service here still.
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Carburetor building & modification services Servicing the Pontiac community over 20 years |
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#10
06-07-2016, 06:37 PM
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If you still have the piece that broke away:
Remove the airhorn Clamp the broke piece in place Drill 2 holes from underneath, and tap for a 2x56 machine screw Install (2) 2x56 machine screws with a drop of blue loctite on the thread Let set unmolested for 24 hours. Fixed. If you do not have the missing piece, cut one from an otherwise unuseable airhorn for the piece. Jon.
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"Good carburetion is fuelish hot air".  "The most expensive carburetor is the wrong one given to you by your neighbor". If you truly believe that "one size fits all" try walking a mile in your spouse's shoes! Owner of The Carburetor Shop, LLC (of Missouri). Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings. |
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#11
06-07-2016, 07:19 PM
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Quote:
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The More People I Meet, The More I Love My Dogs! |
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#12
06-07-2016, 09:41 PM
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^^^^ sounds fine.
Just want to say (a long time ago) i broke that piece off, and JB-Welded it back on and it held through many Street/Strip uses. Worked yet a better fix gives better assurance. |
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#13
06-08-2016, 01:43 AM
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Is there some under lying problem that might cause this?
I had this happen a few years back on an Olds carb. Carb still worked just fine until I replaced it with another correct #. Until this happened, I had never heard of this problem before. Since then, only seen or read of a few examples.
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71olds cutlass S 455/400--longtime oldsmobile owner with a soft spot for pontiacs 
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#14
06-08-2016, 06:11 AM
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It usually happens when the roll pin is pushed back thru instead of cutting it off and driving a new one in place.
I repair them all the time here, with or without the original part.....Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#15
03-18-2018, 02:01 PM
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Poncho Joe your post #5 of 6/7/2016 where do you get such a splined pin to make such a repair to broken air horn?
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