We will bring you more posts about the car in the future, but for now I hope you enjoyed this article about rebuilding a Rochester Quadrajet carburetor! Take pictures of every hose, with the label clearly marked and showing in the images. Sometimes the accelerator pump bore gets glazed where it doesn't seal against the piston very well. If you have a leaking plug, repair it right. Fortunately if need be, the lead can be fairly easily removed, or drilled to give bypass air. If this ever comes up, follow the channels from the baseplate into the body and you'll find these bypass holes. Having ruled that option out, I looked at the cost of buying a Holley or other brand of carburetor.
Epoxy will eventually delaminate from the metal and the leak will resume. The Cliff Ruggles book had recommended placing the carburetor on a block of wood for disassembly. The Rock Solid Choice National Carburetors, Inc. Wear on the primary shaft bores of the throttle plate can be avoided by properly orientating the return spring. What may also be done for a starting point is for the top of the adjustment screw to be just a small amount above the carb body casting without a gasket in place.
An example of how to organize photos into helpful folders on the computer. The fix is easy, just look where the red arrow left is pointing, that's the stop. Under the hood, it had a small block 350 V8 engine with a Rochester QuadraJet carburetor. We were too focused on doing body work to worry about the engine at first. From restoring and renovating them as well as fixing them when they break, Tim always has a tool handy. The early leak-prone plugs can be identified by being brass cup-type plugs as opposed to aluminum. The Quadrajet lasted 35 years, hence the last car to receive the Quadrajet was the 1990 Oldsmobile 307 V8, which was used in the Cadillac Brougham and station wagons from Chevy, Pontiac, Oldsmobile and Buick.
Part 1 — Disassembly This first part of the Quadrajet Carburetor rebuild covers removal and disassembly of the Rochester Quadrajet. That way you can easily adjust the power piston with the carb on the engine. The article is also meant to complement the rebuild guide books available, shedding extra light on any topic or procedure that may require further explanation. In severe enough cases the baseplate can even crack. Plus we also carry a full line of Holley and Edelbrock Performance Carburetors. If you keep the charger plugged into a socket close to where you are working, charging the battery during down time is a breeze.
You can try the smaller shot and if that works well, use it. For the rebuild, you will be using the Chem-Dip, which has strong fumes. However, be aware there is no empirical evidence that this epoxy will work for the life of the carb without any delamination or degradation. Our carburetor before the rebuild. If this is attempted, be sure that the amount of wear is measured so the right thickness of teflon sheet is used.
Wiki articles that provides background information, history, and variants of the Quadrajet carburetors, as well as the pros and cons of using one. Still, I figured that I could learn to do it as well as anyone else. This brings in enrichment sooner or later, as needed. Do not enlarge the orifices unless you know what you're getting yourself into. Organize your tools for easy access. If these orifices are made too large the secondaries can run too rich.
It is also discussed on the thread , post 53, 58, 59. Be aware that this can mean longer warm up times, and may require some changes to the calibrations. Article remains under construction as of June 22, 2011. In addition to his book, Cliff Ruggles also maintains a website , with a forum dedicated to discussing carburetors. The solution is to take a chisel and gently stake the edge of the hole in one or two spots against the retainer. The completed rebuilt carb looking much better in the engine bay. Finally, I used the website as my main reference.
A lean surge will feel like someone is moving the throttle, or you get a hesitation on light throttle acceleration. The secondary air valve only opens when the engine is under a load and the primary throttle blades are opened about half way or more. If they're over tightened, it can warp the carb permanently. With a little tuning from my friend Mike, we got our car to run pretty darn well. Also, take the time to match up the new parts with the old ones as soon as you remove them.