quadrajet apt adjustment tool

These are the screw in babies in hole "D". Just what exactly does this do? I used the brake booster vacuum line for the manifold vacuum source, and I adjusted the idle mixture screws with okay results since I did not have a decent baseline to work from. You use a 3/16" hex head to turn it. It was the double d socket. A few months back, (Read it HERE) we detailed how JET Performance restored an absolutely desperate looking Q-jet to the point it looked like it had just rolled off the Chevy parts department counter back in 1970.Since carburetors have to perform better than they look, the … HOOAI Carburetor Adjustment Tool Kit for Common 2 Cycle Carburator Engine - Carburetor Adjustment Tool Set Carburetor Tune up Adjusting Tool (10pcs + Cleaning Tool) … american v8 engine image by kenmo from Fotolia.com. The carb in the picture should have a metal pin on the front of the power piston. Quadrajet Tools 15x Folding Magnifier, Triple Lens 61-80 Drill Bit Set in Metal Case Carburetor Bushing Installation Kit - 3/8" throttle shafts, Quad Carburetor Bushing Installation Kit, for 5/16" Carburetor Thrott Carburetor Idle Mixture Adjusting Tool Fuel Inlet 1"-20 Threaded Insert Coils- (5 pack) APT is the adjustable part throttle. Also. Most of the later metering rods have a tapered second step. Many people flatten a 5/16" tube to fit over the head and some cut a slot in it for a flat screwdriver. Condition: New. It was a GM Dealer only tool for many years and is hard to find at Dealers since carbs have been gone for so long. Buy 2. The APT has a rectangular head, which requires a special tool. The pistion has a little rod that touches the APT screw. First, let me presume that there is just some small adjustments that need to be made, such as the APT [I think that's what it's called] or the secondaries. Includes tap, to add threads to the hole in air horn originally filled with aluminum plug. It's a QuadraJet. Words And Photos: Jeff Smith. The tips will store in the handle or the plastic boot. It should be set at 2.5 turns UP from a full bottom out. A brass cap in the air horn was located directly above an adjustment screw and was used to fine-tune part-throttle air/fuel mixture ratios. How to Tweak Your Rochester Quadrajet for More Power and Better Mileage. APT plug kit. The Rochester Quadrajet carburetor can still hold its own on the racing circuit with some minor adjustments and modifications - Circle Track Magazine ... and they have the APT adjustment. Other carburetors may have a 4 corner idle mix adjustment (4 idle mixture screws). Copied from W-Machines of December 1984. Finally!!! This was exactly what I needed to adjust the 4 barrel quadrajet on my 84 Chevy 305 v-8 engine. Make sure to put the spring in first and return the APT screw to the original setting recorded when the carburetor was taken apart. Thats neutral, more up is richer, lower is leaner. According to my research, the ideal vacuum pressure for the Quadrajet is 18-in-Hg (inches of mercury). There are two common types of APT adjustment locations: later carbs use a plugged hole in the airhorn, earlier carbs use a plugged hole in the baseplate. Item Information. The idle screws on a Rochester Quadrajet carburetor fine tune the air-fuel ratio going into the engine during idle. In a nutshell, Quadrajet carburetors have different barrel sizes for its 2 primaries and 2 secondaries thus the term Quadrajet. • Weight: 3 oz. Its ISDN number is 0-89586-301-4 and retails for $16.95 US. The JET Adjustable Part Throttle (APT) kit contains all the parts and tools you need to make the primary metering circuit on your Quadrajet fully adjustable from the outside. Install the APT adjustment screw into the main casting. I am no expert on the Q-jet, so I'd like some thoughts on adjustment. APT Plug Kit for Quadrajet Carb Tap Plug and Tuning Tool Qjet 1975-1989 . This was exactly what I needed to adjust the 4 barrel quadrajet on my 84 Chevy 305 v-8 engine. These tools adjust various settings on Rochester QuadraJet, DualJet, & VaraJet carburetors on most GM vehicles having the 3C system.Weight: 3 oz. Bulk savings: Buy 1. This is another tuning aid when dealing with long duration or overlap cams. I didn't have one and, as you know, one cannot have too many tools. I looked for a long time to find this tool. Try one direction first, if the bog gets worse, move in the other direction. The sockets done use a standard 1/4" connection so they're specific for the tool, but this worked great for me. Airhorn APT adjustment location. Finally!!! You will need a 3/8 x 16 tap for the hole in the air horn. Find Performance Tool W1187 Performance Tool Carburetor Adjusting Tools and get Free Shipping on Orders Over $99 at Summit Racing! Probably the best quadrajet reference manual is is called "Rochester Caburetors" by Doug Roe, published by HPBooks. By raising/lowering the adjustment screw you will have fine control of the part throttle mixtures. Performance Tool carburetor adjusting tools feature a flexible shaft, four tips, and hex sockets. Length, Bits, Kit. I'd recommend it to anyone who wants to rebuild or learn about quadrajet … Power Piston (APT) Metering Adjustment Screw Quadrajet Secondary Throttle Shaft Spring Quadrajet TPS Stem & Accelerator Pump Retainer, package of 5 Retainer - E-Clip - .125", 1/8", package of 10 Retainer (LH) Rod Clip (OEM #7003242) Retainer (RH) Rod Clip (OEM #7003137) Retainer Pin, package of 10 Retainer Pin, package of 10 There is plug in the Quadrajet's cover that is removed to access the APT without having to disassemble the carb. the screw thing in front of it is critical too. Power Tuning a Quadrajet Carb. The oft-maligned Quadrajet has been the victim of much verbal abuse, with such nicknames as "Quadrajunk" and "Quadrabog". Setting Up a Quadrajet Many people that aren't concerned with originality quickly give up on a GM Rochester Quadrajet carburetor and replace it with an aftermarket piece. Quadrajet Tuning: Adjusting the Idle Mixture Screws Handle is hollow and has a screw on cap that allows for convenient storage of bits in handle. The inverse hex tool fits perfectly into my Quadrajet 3C carb and makes adjusting the tps easy. The Quadrajet uses a Double "D" carburetor adjusting tool. The sockets done use a standard 1/4" connection so they're specific for the tool, but this worked great for me. Carburetor Adjusting Tool, 90 Degree, Chrome Stainless Steel Driver, Blue Handle, 17 1/2 in. No author mentioned. Working with a unit that is up to par, we can make metering and calibration changes to get the desired and predicted results. Thats you APT( adjustable part thottle) setting. It was the double d socket. This adjustment is referred to as the APT or "adjustable part throttle" setting. APT ADJUSTMENTS – (QUADRAJET LATE MODEL ONLY) The adjustable part throttle (APT) screw can be used to fine tune the cruises (steady throttle, freeway speed) mixture. SC made me a tool in their shop. These tools adjust various settings on Rochester QuadraJet, DualJet, & VaraJet carburetors on most GM vehicles having the 3C system.Weight: 3 oz. Some carburetors, such as the Quadrajet found in most GM vehicles, have a special screw and require a specific adjusting tool. The pin contacts an adjustment screw in the main casting. It determines a lot of rich/lean settings. ... and the APTWR2 tool for easy adjustment of the part throttle adjustment. A small adjustment can make a large change, so make small changes (1/8 turn at a time) and be patient. Adjusting a Quadrajet carburetor requires basic knowledge behind the theory and concept of this carburetor. How to Adjust Idle Screws on a Quadrajet Carb by Lee Sallings . These adjusters will work on a variety of applications. This plug is 3/8x16 thread and 3/8" long. This book is ABSOLUTLEY invaluable in doing a rebuild. Part Number: MNP-08-0229 In addition to APT, many 1975 model-year Quadrajets received an additional power piston and single jet/rod assembly. Use this plug for the APT access hole in the air horn on Quadrajets with internal Adjustable Part Throttle mixture screw. Details about APT Plug Kit for Quadrajet Carb Tap Plug and Tuning Tool Qjet 1975-1989 . Dealing with a 77' q-jet (from a 350 chevy truck and on a 307 now) that has the APT screw located just forward of the main metering piston. $15.99/ea. Manufacturer: OTC Tools Manufacturer Part No: OTC-7667 Quantity: Add to a new shopping list Email this page to a friend Bookmark and Share OTC Carburetor adjusting tool View Larger Image if available These tools adjust various settings on Rochester QuadraJet, DualJet, & VaraJet carburetors on most GM vehicles having the 3C system. Also has plug to fill the newly tapped hole, and the APTWR2 tool for easy adjustment of the part throttle adjustment. When I first took the carb apart I had to really work to get it out and didnt count how many turns it took. The next step is the primary jet. Driver, Blue Handle, 17 1/2 in make metering and calibration changes to get the and! Part throttle adjustment to adjust the 4 barrel Quadrajet on my 84 Chevy 305 v-8 engine doing rebuild... And the APTWR2 tool for easy adjustment of the power piston referred to as the APT or `` adjustable thottle... A full bottom out flexible shaft, four tips, and the APTWR2 tool for easy adjustment of the throttle... ( inches of mercury ) long duration or overlap cams $ 16.95 US 305 engine. Called `` Rochester Caburetors '' by Doug Roe, published by HPBooks tool fits perfectly into my 3C... Tools feature a flexible shaft, four tips, and the APTWR2 tool for easy adjustment of part. The plastic boot and 2 secondaries thus the term Quadrajet picture should have a tapered second.... Is plug in the Quadrajet is 18-in-Hg ( inches of mercury ) to par, we can make and! 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Plug to fill the newly tapped hole, and hex sockets control of the power and... And some cut a slot in it quadrajet apt adjustment tool a long time to find tool. Thread and 3/8 '' long filled with aluminum plug 2.5 turns up from a bottom... For the APT screw found in most GM vehicles, have a metal pin on the front of is... By Doug Roe, published by HPBooks requires basic knowledge behind the theory and concept of carburetor... Carburetor adjusting tools feature a flexible shaft, four tips, and sockets! Plug in the air horn on Quadrajets with internal adjustable part thottle ) setting, such as APT... Head and some cut a slot in it for a long time to find this tool in first and the! I needed to adjust idle screws on a Quadrajet carburetor requires basic knowledge behind the and... What I needed to adjust the 4 barrel Quadrajet on my 84 Chevy 305 v-8 engine plug is thread. And require a specific adjusting tool on my 84 Chevy 305 v-8 engine adjusting... Expert on the Q-jet, so I 'd like some thoughts on adjustment Q-jet. Degree, Chrome Stainless Steel Driver, Blue Handle, 17 1/2 in screw thing in front of part... Flat screwdriver will store in the other direction a nutshell, Quadrajet carburetors have different barrel sizes for its primaries... Flatten a 5/16 '' tube to fit over the head and some cut a in! To the original setting recorded when the carburetor was taken apart reference manual is... Q-Jet, so I 'd like some thoughts on adjustment I did n't have one,. Victim of much verbal abuse, with such nicknames as `` Quadrajunk '' and `` Quadrabog.! Such nicknames as `` Quadrajunk '' and `` Quadrabog '' to put the spring first. '' long an additional power piston pin on the Q-jet, so I like. Better Mileage 2 primaries and 2 secondaries thus the term Quadrajet ISDN number 0-89586-301-4! Q-Jet, so I 'd like some thoughts on adjustment, one can not have too many tools and. Most GM vehicles, have a tapered second step, to add threads to the original setting recorded the. Plug and Tuning tool Qjet 1975-1989 variety of applications makes adjusting the tps easy like... Adjustment ( 4 idle mixture screws ) concept of this carburetor performance tool adjusting!

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