How to rebuild a Rochester Quadrajet 4MV carburetor
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How much wear is too much? If you get an erratic idle or if the shaft moves fore and aft a considerable amount it's obviously worn out. This is mainly caused by the tension the throttle return spring exerts on the shaft/bore, especially if the return spring is installed wrong (more on this below). There will be some play in ALL Q-jets (even new ones), that's why determining how much is ''too'' much is a little tricky. But if it idles good, it's good to go. | How much wear is too much? If you get an erratic idle or if the shaft moves fore and aft a considerable amount it's obviously worn out. This is mainly caused by the tension the throttle return spring exerts on the shaft/bore, especially if the return spring is installed wrong (more on this below). There will be some play in ALL Q-jets (even new ones), that's why determining how much is ''too'' much is a little tricky. But if it idles good, it's good to go. | ||
| − | + | Wear on the primary shaft bores of the throttle plate can be avoided by using a throttle return spring in front of, and in line with, the throttle cable or linkage as shown in the drawing below: | |
| − | + | [[File:Throttle return.jpg|thumb|left|350px|Throttle return spring orientation]] <br style="clear:both"/> | |
=====Throttle blade screw removal===== | =====Throttle blade screw removal===== | ||
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