Editing How to rebuild a Rochester Quadrajet 4MV carburetor
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=Planning and Organization= ''The Planning and Organization section is currently under construction. Please refer to the threads and links under '''Recommended Resources''', which will serve as the basis for this section'' ===Carburetor Identification=== ---- ====Identification Number==== :Necessary for ordering correct rebuild kits and parts. The number is usually found either as a tag or as a stamping in the body on the driver-side of the carburetor, running vertically up and down.''^1'' :It is not uncommon for confusion to arise when decoding a Quadrajet carburetor. According to [http://www.recarbco.com/technical/rochester/qjet.html Recarbo Fuel Systems]: ''<blockquote>"This guide is just that: a guide. It is not set in stone, because it is a documented fact that Rochester didn't follow [http://www.recarbco.com/technical/rochester/qjet.html these rules] 100%. It is for Quadra-jet carburetors only. Rochester also had different numbering systems for their other carbs besides the Quadra-jet. Our thousands of pages of information on this comes straight from Rochester.</blockquote>'' ''<blockquote>Keep in mind that just because the OEM numbers between two carbs may be different, it doesn't mean they are different carbs. It's very possible to have two carbs, their date is 2 years apart, one is for Buick and one is for Chevy Truck, and one is for automatic, the other for stick, and the carbs are identical in every single way, even down to the jets and metering rods. It's much more common than you might think. Also, many people think they have to have a carburetor with a certain exact OEM number. This can sometimes be very very hard. Most people don't have to have this, they really only need a carburetor that crosses over the same and is identical. You realistically only need an exact OEM number if you are restoring a car back to original condition to enter into a car show."^1</blockquote>'' ====Online Sources for Identification==== :''[http://www.cliffshighperformance.com/tech_carb_ID_2.html Carburetor Designation/Identification]'' - Covers casting designations and identification numbers. From Cliff Ruggles' [http://www.cliffshighperformance.com/index.html Cliff's High Performance]. :''[http://www.recarbco.com/technical/rochester/qjet.html Recarbo Fuel Systems]'' - ''"This guide is just that: a guide. It is not set in stone, because it is a documented fact that Rochester didn't follow these rules 100%."'' :''[http://www.carbkitsource.com/carbs/numbers/Rochester/Quadrajet/index.html Rochester Quadrajet Carburetor Numerical Index]'' - From [http://www.carbkitsource.com/ "The Carburetor Doctor"]. ===Parts=== ---- #Carburetor Rebuild Kits #Individual Parts #Sellers / Sources ===Tools=== ---- ====Parts Organizer==== :The carburetor is held together and in place with a multitude of bolts of variuous sizes. There are also alot 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 often use things usually found around the house such as cupcake pan, silverware tray, or an egg carton will do the job.''^2'' According to [http://www.hotrodders.com Hotrodders] forum member '''''trees''''': '':<blockquote>"As a technique, I use two pans and lable 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''</blockquote>'' ====Tools==== #Socket wrench set #Open-end wrench set #Screwdrivers - various sizes #Punch #Hammer #Parts cleaning tray #Parts cleaning brush #Wire brush # #7 drill bit ''^4'' #Shop towels / rags ====Chemicals==== #Parts cleaner dip - 1 gallon can is sufficient #Carburetor cleaner spray ====Digital Camera==== :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. :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'', ''Disassembly'', etc. Extra effort here will save alot of time and headache in the future when you have go through the photos to match up the right parts or bolts. :The only thing you will need to keep an eye on is the battery life. 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. :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. ====Books / Guides / Websites==== :'''''"How to Rebuild and Modify Rochester Quadrajet Carburetors"''''' by Cliff Ruggles is a frequent recommendation by the members of [http://www.hotrodders.com Hotrodders]forum. It is a highly-reviewed book that is regularly recommended on the [http://www.hotrodders.com Hotrodders] forum, and the author is considered a leading authority on Quadrajet carburetors. :In addition to his book, Cliff Ruggles also maintains a website ([http://www.cliffshighperformance.com/ Cliff's High Performance]), with a forum dedicated to discussing carburetors. :Other titles devoted to Rochester Quadrajets are also available from retailers such as [http://www.barnesandnoble.com/ Barnes and Noble], [http://www.amazon.com Amazon], [http://www.ebay.com eBay] and its sister site [http://www.half.com Half.com]. ===Safety=== ---- ====Ventilation==== ====Lighting==== ====Protection==== #Goggles #Gloves #Clothing ---- =Procedures= ---- ''The Procedures section is currently under construction. Please refer to the threads and links under '''Recommended Resources''', which will serve as the basis for this section'' ===Set Up=== ---- ===Removal=== ---- ===Dis-Assembly=== ---- ===Cleaning=== ---- ===Rebuilding=== ---- ====Trouble Spots==== Please keep an eye on the following areas during dis-assembly and rebuild. =====Loose Power Piston Retainer Cap===== :Signs :Solutions :#Replacement :#Staking ::*Procedure =====Leaking Plugs / Main Wells===== According to [http://www.Hotrodders.com Hotrodders] forum member '''''cobalt327''''': ''<blockquote>"A common problem on the early Q-jets especially, is leaky main wells. The 'cure' for this has long been to use JB Weld, etc. to seal them over. This is just a stop-gap measure, I have seen personally how the epoxy will degrade over time and quit sealing as it did at first. If a permanent fix is wanted, the wells can be resealed w/new plugs that are peened over to hold them in place. The primary wells can be drilled and tapped for short screws that will cure them for good, although these wells seldom leak. ^5</blockquote>'' =====Worn Shaft Bushings===== :Signs :Solutions ::Repair Kits ::*Procedure =====Cleaning Float Bowl Orifices===== Please see posts numbers 23 through 28 on page 2 in the thread ''[http://www.hotrodders.com/forum/rochester-quadrajet-4mv-carburetor-removal-disassembly-rebuild-rookie-level-190558-2.html Rochester Quadrajet 4MV Carburetor: Removal, Disassembly, Rebuild (Rookie Level)]''. ===Re-Installation=== ---- ===Tuning=== ---- ---- =Recommended Resources= === Wiki Articles=== ;[http://www.crankshaftcoalition.com/wiki/How_to_rebuild_automotive_carburetors '''''How to rebuild automotive carburetors'''''] :Wiki article intended to provide information on rebuilding a carburetor. ''(Article remains under construction as of June 22, 2011)''. ;[http://www.crankshaftcoalition.com/wiki/Quadrajet '''''Quadrajet'''''] :Wiki articles that provides background information, history, and variants of the Quadrajet carburetors, as well as the pros and cons of using one. ===Hotrodders Forum Threads=== ;[http://www.hotrodders.com/forum/rochester-quadrajet-4mv-carburetor-removal-disassembly-rebuild-rookie-level-190558.html '''''Rochester Quadrajet 4MV Carburetor: Removal, Dis-Assembly, Rebuild (Rookie Level)'''''] :The thread discusses the removal, complete tear-down, cleaning, rebuild kits, rebuild process, re-installation, and tuning of a Quadrajet 4MV model. The discussion includes detailed, step-by-step pictures, various links to online resources, and lots of helpful advice from forum members. ;[http://www.hotrodders.com/forum/q-jet-power-piston-springs-160724.html '''''Q-Jet Power Piston Springs'''''] :Thread offers information on power piston springs in relation to tuning a Rochester Quadrajet. Information provided on spring ratings, manufacturers and part numbers*. ===Other Resources=== ;[http://www.digitalcorvettes.com/forums/showthread.php?t=88376 '''''Quadrajet Info by Lars'''''] :A detailed document written by Lars Grimsrud on troubleshooting and tuning Quadrajet carburetors. ;[http://4x4mecca.com/upload/demouploads/Quadrajet_Service_Manual_1981.pdf '''''Delco Quadrajet Carburetor,Models 4MV-4MC-M4ME-M4MC Service Manual'''''] :Factory manual for servicing Quadrajet carburetors. Contains very useful and detailed information, images and diagrams to assist with servicing and rebuild. ---- =Reference= ''^1'' [http://www.recarbco.com/technical/rochester/qjet.html Recarbo Fuel Systems] ---- ''*Manufacturers and/or part numbers may no longer be current. Members are urged to add updated information if and when they come across it.'' ''**For current availability, edition and pricing, please visit an online book retailer such as [http://www.amazon.com Amazon],[http://www.ebay.com eBay], or [http://www.half.com Half.com]. This title is also available through Ruggles' website.''
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