How to rebuild a Rochester Quadrajet 4MV carburetor
(Unleaded Fuel vs epoxy) |
(→Throttle blade screw removal) |
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If primary throttle shaft bushings are to be installed, the throttle shaft has to first be removed. After removing all the linkages and choke parts from the end of the shaft, the throttle blades will need to be removed. | If primary throttle shaft bushings are to be installed, the throttle shaft has to first be removed. After removing all the linkages and choke parts from the end of the shaft, the throttle blades will need to be removed. | ||
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| + | <b>No Drilling/Teflon Bushing fix</b> | ||
| + | I found a great article to re-bush the primary shaft with no drilling by simply cutting 0.00015 teflon sheet to size and using the outer holes (where most ppl re-drill/insert the bronze bush). Its a perfect fit. | ||
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| + | <br><br> Original article here: [http://67-72chevytrucks.com/vboard/showthread.php?p=4688535]<br> | ||
| + | [[Media:http://i175.photobucket.com/albums/w131/ray_mcavoy/QJet_throttle_shaft_bushings/QJet_3.jpg]]<br> | ||
| + | [[Media:http://i175.photobucket.com/albums/w131/ray_mcavoy/QJet_throttle_shaft_bushings/QJet_10.jpg]]<br><br> | ||
| + | Whats nice about this is you can also bush the vacuum shaft as well. Excessive play stops the vacuum blades from opening/closing smoothly because the blades bind into the body. Most people fix this by increasing the spring tension. The teflon means you can pretty my bush more than the primary shaft without the need for more drilling, tubes, etc. Plus it leaves the body original. There are some nasty over drilled howto's that look awful. | ||
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First, the ends of the original screws have to be ground away because they're "staked" at the factory. You may notice the ends are split a slight amount to make them impossible to loosen, back out and fall into the intake. | First, the ends of the original screws have to be ground away because they're "staked" at the factory. You may notice the ends are split a slight amount to make them impossible to loosen, back out and fall into the intake. | ||
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Be very careful if you end up trying to find a replacement for the secondary shaft. They are not all the same. I'm curious. Why did you remove the shaft if you aren't bushing it? | Be very careful if you end up trying to find a replacement for the secondary shaft. They are not all the same. I'm curious. Why did you remove the shaft if you aren't bushing it? | ||
| − | The secondary throttle shaft do not need bushings. If the secondary shaft/throttle plate bore is that bad, the rest of the carb is likely worn badly; another core or at a least another throttle plate should be considered. | + | The secondary throttle shaft do not need bushings. If the secondary shaft/throttle plate bore is that bad, the rest of the carb is likely worn badly; another core or at a least another throttle plate should be considered. |
=====Cleaning orifices===== | =====Cleaning orifices===== | ||
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