Editing How to rebuild a Rochester Quadrajet 4MV carburetor (section)
Jump to:
navigation
,
search
==Other considerations== *When getting a carb from another vehicle, whenever possible, get the factory cable bracket. Even if you're using an aftermarket intake, it might come in handy for making up your own bracket. And regardless if using an aftermarket intake or not, the bracket can be used to measure the correct cable/carb relationship for setting up whatever bracket that's used. The throttle linkage are specific to the manufacturer (GM products including 1971 Ford Mustangs with the 429 Cobra Jet and mid-1980s Mopars have used the Quadrajet). *Make note of the engine displacement/engine VIN code. These carbs were used on 4.3L V6 through 7.4L V8 engines (besides its use with GM products the Quadrajet was found in some obscure applications e.g. 1971 Ford Mustangs with the 429 Cobra Jet and 1983-88 Chrysler vehicles), so knowing what it came from gives a leg up on what may potentially need changed. *If the Q-jet is to be used with an automatic transmission that uses a detent (kick down) or TV (throttle valve) cable, be sure the throttle arm is correct (below, right). Many manual transmission-equipped vehicles are missing the lower part of the throttle arm (below, left); this is where the detent/TV cable ordinarily attaches. {| |[[File:TYPICAL MANUAL TRANS Q-JET THROTTLE ARM1.jpg|250px|Manual or TH400 trans throttle arm that's missing the portion below the throttle shaft center line where the detent/TV cable would be attached]] |[[File:LINKAGE TH350 CARB WITH AT.jpg|215px|Automatic trans throttle arm]] |}<br> ===B. Parts=== ====Carburetor rebuild kits==== Available through various manufacturers. For user experiences, please check out the ''Hotrodders'' forum thread, [http://www.hotrodders.com/forum/q-jet-rebuild-kit-210485.html#post1502078 '''Q-jet rebuild kit''']. ====Individual parts==== Please refer to the '''''[[How to rebuild a Rochester Quadrajet 4MV carburetor#Quadrajet tuning and repair parts|Quadrajet tuning and repair parts]]''''' section below. ====Sellers/sources==== *[http://www.cliffshighperformance.com/index.html '''Cliff's High Performance'''] *[http://quadrajetparts.com/index.php '''QuadrajetParts.com'''] *[http://www.carburetion.com/index.htm '''Carbs Unlimited'''] *[http://www.carbkitsource.com/ '''The Carburetor Doctor'''] ===C. Tools=== =====Parts organizer===== :The carburetor is held together and in place with fasteners of various sizes. There are also a lot of small parts on the inside of the carburetor body. It is very important to use some sort of a parts organizer to separate everything. It does not have to be anything fancy. You can use things usually found around the house. Egg cartons work well, and the top can be closed to keep the parts in place. Old ice cube trays can also be used. :Other ideas suggested by [http://www.hotrodders.com Hotrodders] forum members: :''<blockquote>"The muffin pans work great. As a technique, I use two pans and label each "bin" and place the old part in one bin and at the same time, I place the new part in the other pan. Most kits are 'generic' so this is the best time to pick out the part that matches the removed part and set the residual parts aside. " ^3'' - '''''trees''''', forum member.</blockquote> :''<blockquote>"a cupcake pan works really well for organizing parts ... i also use an old silverware tray for parts" ^'' - '''matts37chev''', forum member.</blockquote> =====Tools===== There are a few tools that will make rebuilding the Q-jet easier: * A 1/16" punch for removing the accelerator pump arm roll pin * An adjustable T-square for setting float level * A "pin vice" and a set of small numbered drill bits for measuring and making (or enlarging) small diameter holes. They are bought typically in sets numbered from #61 (0.0390") to #80 (0.0135"). Numbered bits are also available larger than #61- all the way to #1 (0.2280"). At this point, lettered bits take over. Interspersed throughout these are also the fractional and metric sizes. [[File:Numbered bit index.jpg|thumb|300px|left|Small numbered drill bit index]][[File:Pinvice.jpg]] [[File:115 pc drill set.jpg|thumb|300px|left|115 piece drill index]] <br style="clear: both" /> Having a complete 115 piece drill bit index is a very handy tool to have- it allows making, measuring and gauging holes as well as setting Holley and other float levels where the bit can be fit under the float, or above it when setting the float drop. :*Socket wrench set :*Open-end wrench set :*Screwdrivers - various sizes :*Hammer :*Parts cleaning tray - Keeps the parts in place and also keeps any chemicals from spilling in undesired places. :*Parts cleaning brush - Used for cleaning off most of the grime and gunk off the carburetor parts after dipping them. :*Wire brush - Used for scrubbing off the tough spots after dipping the parts. :* #7 drill bit ''^4'' :*Shop towels / rags :*Compressed air - For blow-drying carburetor parts after cleaning and washing them. :*Carburetor stand - used to keep the carburetor in place while working on it. It is useful for testing out all linkages before re-installation. You can buy one from any performance auto parts supplier or build your own. For ideas, check out this [http://www.forabodiesonly.com/mopar/showpost.php?p=498702&postcount=2 post] on [http://www.forabodiesonly.com/ For A-Bodies Only] <blockquote>''"I built a stand to hold the carb body so that I could functionally check all the linkage and clearances on the butterflies. It also makes assembly of the metering rods much easier. You can buy a stand, but hard to justify unless you plan on rebuilding lots of carbs. My Q-jet book told me how to build the stand and it has been invaluable over the years."'' - '''''trees''''', [http://www.hotrodders.com Hotrodders]forum member.</blockquote> =====Chemicals===== :*Parts cleaner dip - 1 gallon can is sufficient for the job. This is a powerful chemical with strong fumes. Care must be taken to protect the skin and eyes, and provide proper ventilation. The use of latex gloves and a full-sleeved shirt is highly recommended when working with this chemical. [[File:Chem Dip.jpg|frame|center|Berryman Chem-Dip Carburetor & Parts Cleaner with parts dipping tray.]] :*Carburetor cleaner spray - A few cans should be kept on hand. =====Taking photos===== <blockquote>''"Disassembly tips? Take lots of close up, well lit pictures of the linkages." ^'' - '''''cyclopsblown34''''', [http://www.hotrodders.com Hotrodders] forum member.</blockquote> :A digital camera with a good flash will come in very handy. There is no need for a top of the line camera. Even today's cellphones with 5 megapixel or higher rating are more than sufficient. Become familiar with the camera you have and use it to photograph everything, from every angle, every step of the way. If you ever get lost during the rebuild process, you only need to flip through a few pictures to get back on track. :The things you will need to keep an eye on are protecting the camera from grease and dip, and the battery life. Battery life varies from camera to camera, as well as the age. Make sure to keep the camera fully charged and as often as possible. If you keep the charger plugged into a socket close to where you are working, charging the battery during down time is a breeze. =====Step-by-step documentation tips===== :Remember, with a digital camera, there are no limitations on how many pictures you can take because you are not using film. And when you upload your pictures, be sure to organize them into folders and sub-folders with useful categories for titles, i.e. ''Removal'', ''Dis-assembly'', etc. Extra effort here will save a lot of time and headache in the future when you have to go through the photos to match up the right parts or bolts. [[File:Image Organization.jpg|frame|center|An example of how to organize photos into helpful folders on the computer.]] :As you organize photos, be sure to delete an "extras" or unusable shots. You can do this either as you are taking pictures or when you upload them to your computer. This will further eliminate clutter and you will only have to go through pictures that are useful. It is also a good idea to use a photo editor for processing images. Quick cropping, sharpening and brightening of photos will turn many mediocre shots into useful images. For a free and easy to use photo editor, [http://www.photoscape.org/ps/main/index.php Photoscape] is recommended. [http://www.gimp.org/ GIMP] is another one, but with more sophisticated features. :If you prefer, keep written notes as you go along. A picture is a thousand words, but a handy set of notes can be quite valuable too. If you have printed out this article, use the empty spaces to jot notes as needed. This way, everything you need will always be in on place. ===D. Safety=== ---- Safety is always a top priority in any project, especially those which require tools and chemicals. Be sure to work in a place that can keep out children and animals. When using chemicals, it is a good idea to warn anyone nearby of fumes. Please refer to [[Health and safety in the shop or garage]] for helpful tips and ideas. =====Ventilation===== :Ventilation is very important when working with chemicals. For the rebuild, you will be using the Chem-Dip, which has strong fumes. If working inside the garage or other indoor places, be sure to keep the windows and doors fully open. If available, employ a large exhaust fan to suck out the fumes. =====Lighting===== :Carburetor rebuilds deal with small parts, precise measurements and various tools and chemicals. Proper lighting is key to getting the job done safely without errors or hazardous mistakes. =====Protection===== #Goggles #Latex Gloves #Clothing
|
Editing help
(opens in new window)
Personal tools
Log in / create account
Namespaces
Page
Discussion
Variants
Views
Read
Edit
View history
Actions
Search
Navigation
Main Page
Recent changes
Random page
Help
All articles
Start a new article
Hotrodders forum
Categories
Best articles
Body and exterior
Brakes
Cooling
Electrical
Engine
Fasteners
Frame
Garage and shop
General hotrodding
Identification and decoding
Interior
Rearend
Safety
Steering
Suspension
Tires
Tools
Transmission
Troubleshooting
Wheels
Toolbox
What links here
Related changes
Special pages
Terms of Use
Copyright
Privacy Policy
Your Privacy Choices
Manage Consent