QuadraJet 702 Carburetor Rebuild
Вставка
- Опубліковано 23 лип 2024
- This Quadrajet 702 had seen better days, and a complete rebuild/restoration was needed to bring it back into service in a 1969 Corvette Stingray.
And even though aluminum does not rust, it corrodes to make a restoration really challenging.
Anyway, after days of cleaning, rebuilding, polishing, and reassembling every single part, this 702 was brought back from the dead and it's ready to be put back into service.
If you have always wanted to rebuild your Quadrajet, I think you will find this video very helpful.
Thank you for watching! 🙂👍🏻
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CONTENTS
00:00 The Quadrajet 702 Carburetor
00:38 Disassembly
01:02 Removing the Idle Vent
02:08 Removing the Accelerator Pump Lever
03:03 Removing the Curb Idle Screw
03:13 Removing the Fuel Filter
03:45 Removing the Idle Mixture Screws
04:40 Disconnecting the Choke Rod
05:14 Removing the Vacuum Brake and Fast Idle Mechanism
06:50 Removing all the Air Horn Screws
07:57 Removing the Secondary Metering Rods
08:41 Removing the Choke Rod
08:53 Removing the Air Horn
09:40 Removing the Accelerator Pump
10:00 Removing the Air-Horn-to-Body Gasket
10:35 Removing the Float Bowl Insert and Power Piston
11:33 Removing the Carburetor Bowl Float and Needle
12:18 Removing the Primary Jets
13:31 Removing the Check Ball
14:12 Removing the Needle Seat
15:22 Removing the Secondaries Baffle
15:56 Removing the Base Plate, aka Throttle Body
18:01 Inspecting the Secondary Well Plugs
20:10 Removing the Primary Throttle Shaft
22:49 Removing the Secondary Shaft Springs
24:35 Giving the Carburetor Body a Bath
25:28 Removing the Air Horn Well Tubes
27:37 Cleaning and Detailing the Carburetor Body
30:06 Grinding Down the Primary Throttle Blade Screws
31:24 Removing the Secondary Vacuum Brake
32:39 Well Plugs Leak Test
33:59 Sealing the Well Plugs with Epoxy
36:24 Second Well Plugs Test After Adding Epoxy
37:18 Polishing the Carburetor Body, Air Horn, and Base
38:36 Air Horn Well Brass Tubes Reinstalled
40:21 Replacing the Idle Vent Seal
41:47 Reinstalling the Idle Vent Parts
43:00 Installing a new Power Piston Retainer
43:52 Installing a new Vacuum Brake
44:14 Reinstalling the Carburetor Base Plate
45:14 Installing a New Fuel Filter
46:04 The Carburetor Body Choke Lever and Rod
47:28 Float Adjustments
48:23 How to Install the Needle Clip or Hanger
50:15 Final Assembly and Adjustments
51:58 The 702 Quadrajet Before...
52:46 and the 702 Quadrajet After
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- 68-82 Vette Resto Guide: amzn.to/2QvvIG
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DISCLAIMER: Even though I like to wrench on Corvettes and most of my videos are of a how-to nature, I am not responsible nor liable should you decide to follow my musings on the subject.
The repairs and other work I do are for my own benefit and entertainment, and even though my videos may sound and appear to give technical how-to advice, that's not my intention.
Working on a vehicle is inherently dangerous. If you're not confident, qualified, or lack the tools to do the job correctly and safely, hire a licensed mechanic.
#c3corvette #quadrajetcarburetor #carburetor - Авто та транспорт
Awesome video! Great detail! your videos will be great to come back to every time I work on a Quadrajet in the future! Thanks for making these videos, they will be such a great help for us!
Thank you for watching as well as the kind words. I was missing a 702 for the 702/704/1705 trifecta. Not anymore! Lol 😆
@@76vette 👍
Parabéns! Gratidão sempre Eu Sou!
We did not get to see the repair of the primary throttle shaft bushings.
The broken screw & reassembly:)
The most dramatic part..
As said at the fuel desk in Philadelphia.
“The first time is always dramatic.”
ua-cam.com/video/doD9qyFmvK4/v-deo.html
ua-cam.com/video/z0tfNK-diFk/v-deo.html
Thank u I have the AIMS book and service manual but cannot find FT torque pounds for bolt down to manifold thanks
You are welcome. Glad to help. 😊👍🏻
At 39:53 when you said you got this all buttoned up. For the life of me I can’t figure out the orientation of the first round spring, or the second that doubles as a retaining clip!
I think this video may help clarify how the springs are installed. 😊👍🏻 ua-cam.com/video/PPPGVbAF7h8/v-deo.html
Very interesting and useful !
I have a '69 427 from a Corvette in the chevelle I just bought. Do you happen to know how to connect the vacuum lines to the distributor, carb etc? It seems that what is on mine is not all hooked up. Thanks
The distributor vacuum advance uses one vac line that needs to be connected to a ported vac port usually located at the front of the carburetor body. If there are unused carb vacuum ports (ported or manifold), you want to plug those properly.
Good luck and Thank You for watching! 😊👍🏻
Hi could you please tell me the torque specs on the 4 mounting bolts on carb to intake , also is there a torque spec for the top horn screws. Thank you
From the 1981 Shop Manual… (I think they’re all pretty much the same)
“CARBURETOR MOUNTING TORQUE
When torquing carburetor after removal, overhaul, replacement or when installing a new heat insulator, torque mounting bolts, in a clockwise direction, to 16 N•m (144 in. Ibs.).
When retorquing carburetor at recommended maintenance intervals, check in a clockwise direction. If less than 7 N-m (60 in. Ibs., retorque to 11 N.m (96 in. Ibs.); if greater than 7 N•m (60 in. Ibs.), do not retorque.”
As far as the air horn, it just says to “tighten all screws evenly and securely using the screw tightening sequence” starting with the two countersunk screws inside the choke Venturi, followed by the inner secondary screws all the way to the back of the carb, then two outer middle, then two outer rear, then front screws.
This information is why I sound like a broken record when I say that you MUST have as many books as possible if you’re going to wrench on these cars. 😊👍🏻
I'm waiting for a rebuild kit for mine and this video will be GOLD, thank you! Did you have some trick to replace the idle tubes too?
I did not remove or replace the idle tubes. However, I cleaned them as much as possible using wire strands as shown in this video: ua-cam.com/video/gz_1RQp3ww4/v-deo.html
They can be removed, of course, if necessary, and there are several videos available that show that approach, which basically involves a coarse-thread screw to bite into the soft metal so you can pull the tubes out.
I think running the right gauge wire through them and plenty of carb cleaner can be just as effective.
Good luck with your rebuild and I hope you’re happy with the results. And thank you so much for watching! 😊👍🏻
@@76vette problem is that I have a '68 vette 327/300 with a quadrajet that is an old/unknown rebuild and not the exact fit for my application (7028213 vs 7028207 from spec). I already got some problems like lean idle and poor response to adjusting screws, so since now it is flooding due to worn gaskets (I live in EU and here we have mandatory ethanol) I'm taking the occasion to change the idle tubes with a .040 pair to see if it can run better. I knowed the coarse-thread screw method but, since I want to do less damage possible to the old ones, I was wondering if there was a less aggressive way
@MetalGarage Unfortunately, the only method I know of is to use a screw to pull them out.
The only real damage would be some scarring inside which can be pretty much eliminated by running a micro drill bit through the jet.
This kit here is almost identical to the one I have and it may be a good investment for you.
amzn.to/3Ua8nt0
Also, if you are planning on replacing the original tubes then any potential “damage” to them should not be a concern, unless you are planning to reuse them at some point.
Just a thought.
@@76vette I would like to save the old ones just in case the new .040 will run too rich. I will be careful.Thanks!
Also make sure your carb has the right jets, metering rods, and idle mixture screws. The guys at quadrajetpower.com will sell you a complete rebuild kit specifically calibrated for your application.
Good luck! 😊👍🏻