How to rebuild a Rochester Quadrajet 4MV carburetor
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This article is written with the intention of informing, guiding and assisting the first-time builder who has never dealt with a carburetor before. It merges detailed, step-by-step directions, complete with images, links to online and print resources, and a multitude of helpful tips and pointers collected from the members of [http://www.Hotrodders.com Hotrodders] forum, all of them in their own words. | This article is written with the intention of informing, guiding and assisting the first-time builder who has never dealt with a carburetor before. It merges detailed, step-by-step directions, complete with images, links to online and print resources, and a multitude of helpful tips and pointers collected from the members of [http://www.Hotrodders.com Hotrodders] forum, all of them in their own words. | ||
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| + | Although the article specifically deals with the Rochester Quadrajet 4MV model, the information found here is useful for working on other Rochester 4 barrel models as well. | ||
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=====Books/ Guides/ Websites/ Multimedia===== | =====Books/ Guides/ Websites/ Multimedia===== | ||
| − | :'''''"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 and the author is considered a leading authority on Quadrajet carburetors. | + | :'''''"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 and the author is considered a leading authority on Quadrajet carburetors. |
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| − | =====Carburetor Identification Decoding===== | + | =====Carburetor Identification: Locations and Decoding===== |
:Once it has been determined that your Rochester Quadrajet carburetor requires a rebuild, the first thing to do is to locate the identification number. The identification number will help with ordering the correct set of parts or a rebuild kit. 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'' Should a need arise for decoding, please see the following article for further information and assistance: [[Rochester Quadrajet Carburetors: Identification and Decoding]] | :Once it has been determined that your Rochester Quadrajet carburetor requires a rebuild, the first thing to do is to locate the identification number. The identification number will help with ordering the correct set of parts or a rebuild kit. 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'' Should a need arise for decoding, please see the following article for further information and assistance: [[Rochester Quadrajet Carburetors: Identification and Decoding]] | ||
[[File:Carburetor_Identification_Number.jpg|thumb|center|750x250px|ID Number 17057525 APP 3356]] | [[File:Carburetor_Identification_Number.jpg|thumb|center|750x250px|ID Number 17057525 APP 3356]] | ||
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| − | <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> | + | <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> |
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''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'' | ''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'' | ||
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#Print out the '''''Procedures''''' section of this article and keep it at your workspace. This way, you won't get any grease on the books or the computer. | #Print out the '''''Procedures''''' section of this article and keep it at your workspace. This way, you won't get any grease on the books or the computer. | ||
#If you are a visual learner and can keep a laptop or other computer device with internet access near by, you can follow along with the video series by [http://www.youtube.com/user/alpheus1975 alpheus1975] on [http://www.youtube.com Youtube], or any other video/multimedia resource you find helpful. | #If you are a visual learner and can keep a laptop or other computer device with internet access near by, you can follow along with the video series by [http://www.youtube.com/user/alpheus1975 alpheus1975] on [http://www.youtube.com Youtube], or any other video/multimedia resource you find helpful. | ||
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:*Throttle return spring | :*Throttle return spring | ||
:*Divorced-choke coil- Unscrew from the intake manifold if applicable. | :*Divorced-choke coil- Unscrew from the intake manifold if applicable. | ||
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Place the carburetor on the stand if you have one. Keep a couple of shop towels or rags around it in case any more fuel spills out during dis-assembly. | Place the carburetor on the stand if you have one. Keep a couple of shop towels or rags around it in case any more fuel spills out during dis-assembly. | ||
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====Accelerator Pump Actuator==== | ====Accelerator Pump Actuator==== | ||
| + | ''Coming soon.'' | ||
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====Choke and Linkage==== | ====Choke and Linkage==== | ||
| + | ''Coming soon.'' | ||
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====Air Horn and Metering Rods==== | ====Air Horn and Metering Rods==== | ||
| + | ''Coming soon.'' | ||
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====Float Bowl==== | ====Float Bowl==== | ||
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*Idle mixture screws | *Idle mixture screws | ||
*Gasket | *Gasket | ||
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:#Replacement | :#Replacement | ||
:#Staking | :#Staking | ||
| − | ::<blockquote>''"It is not uncommon for the retainer to fail to positively secure the PP in its hole in and of itself. The solution is to take a chisel and gently stake the edge of the hole in one or two spots against the retainer." ^'' - '''''TommyK''''', | + | ::<blockquote>''"It is not uncommon for the retainer to fail to positively secure the PP in its hole in and of itself. The solution is to take a chisel and gently stake the edge of the hole in one or two spots against the retainer." ^'' - '''''TommyK''''', [http://www.hotrodders.com Hotrodders] forum member. |
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Also please see post #48 on [http://www.hotrodders.com/forum/rochester-quadrajet-4mv-carburetor-removal-disassembly-rebuild-rookie-level-190558-4.html page 4] on the thread [http://www.hotrodders.com/forum/rochester-quadrajet-4mv-carburetor-removal-disassembly-rebuild-rookie-level-190558.html "Rochester Quadrajet 4MV Carburetor: Removal, Disassembly, Rebuild (Rookie Level")] | Also please see post #48 on [http://www.hotrodders.com/forum/rochester-quadrajet-4mv-carburetor-removal-disassembly-rebuild-rookie-level-190558-4.html page 4] on the thread [http://www.hotrodders.com/forum/rochester-quadrajet-4mv-carburetor-removal-disassembly-rebuild-rookie-level-190558.html "Rochester Quadrajet 4MV Carburetor: Removal, Disassembly, Rebuild (Rookie Level")] | ||
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=====Worn Shaft Bushings===== | =====Worn Shaft Bushings===== | ||
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=====Cleaning Float Bowl Orifices===== | =====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)]''. | 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)]''. | ||
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| + | ===E. Cleaning=== | ||
| + | ---- | ||
| + | ''Coming soon.'' | ||
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| + | ===F. Rebuilding=== | ||
| + | ---- | ||
| + | ''Coming soon.'' | ||
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| + | Before begining the rebuild, be sure all potential issues listed in the '''''Trouble Spots''''' section have been inspected and addressed. | ||
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'''Cautionary Note:''' According to [http://www.hotrodders.com Hotrodders] forum member '''''cyclopsblown34''''': | '''Cautionary Note:''' According to [http://www.hotrodders.com Hotrodders] forum member '''''cyclopsblown34''''': | ||
<blockquote>''"That nut on the backside of the carburetor base plate, do not overtighten it. Use a thread sealant tape or paste on it and don't wrench down hard on it, the casting is thin and will crack if over torqued. you can pretty much get it tight by feel, the sealant allows you to tighten it with less torque and still have a good seal." ^''</blockquote> | <blockquote>''"That nut on the backside of the carburetor base plate, do not overtighten it. Use a thread sealant tape or paste on it and don't wrench down hard on it, the casting is thin and will crack if over torqued. you can pretty much get it tight by feel, the sealant allows you to tighten it with less torque and still have a good seal." ^''</blockquote> | ||
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;[http://www.hotrodders.com/forum/q-jet-power-piston-springs-160724.html '''''Q-Jet Power Piston Springs'''''] | ;[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*. | :Thread offers information on power piston springs in relation to tuning a Rochester Quadrajet. Information provided on spring ratings, manufacturers and part numbers*. | ||
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| − | + | =====Online Sources for Identification and Decoding===== | |
:''[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.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]. | ||
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