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.
-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:
+Wear on the primary shaft bores of the throttle plate can be avoided by properly orientating the return spring. While theoretically the best way is to use a bellcrank ("Best", below), using a throttle return spring in front of, and in line with, the throttle cable or linkage ("Better", below) is simpler and very nearly as good as a bellcrank assembly:
-[[File:Throttle return.jpg|thumb|left|350px|Throttle return spring orientation]] <br style="clear:both"/>
+[[File:Throttle return good.jpg|thumb|800px|left|Good hrottle return spring orientation]] <br style="clear:both"/>
+Throttle return springs used as shown below should be avoided:
+[[File:Throttle return bad.jpg|thumb|800px|left|Bad throttle return spring orientation]] <br style="clear:both"/>
 =====Throttle blade screw removal=====

Revision as of 13:38, 17 May 2012