How to rebuild a Rochester Quadrajet 4MV carburetor
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=====Stripped or loose/damaged fuel inlet threads===== | =====Stripped or loose/damaged fuel inlet threads===== | ||
| − | This is an all-too-common problem on the Q-jet. Because the casting is relatively thin and the threads are so large (7/8-20 for most 1971-back carbs, 1"-20 for later carbs), using an oversize fuel inlet to cut new threads is to be avoided if at all possible. The | + | This is an all-too-common problem on the Q-jet. Because the casting is relatively thin and the threads are so large (7/8-20 for most 1971-back carbs, 1"-20 for later carbs), using an oversize fuel inlet to cut new threads is to be avoided if at all possible. The better solution is to use a helicoil-type thread insert. For best results this requires a mill and a fixture for holding the carb body perfectly in alignment for the tap to cut the threads. The tap has to be modified to also cut the seat at the bottom of the threads for the inlet gasket to seal on. |
[http://www.cliffshighperformance.com/services.html Ruggles] and [http://quadrajetparts.com/rochester-quadrajet-parts-quadrajet-inlet-fittings-service-fuel-inlet-thread-repair-heli-coil-installation-inlet-carburetors-pr-356.html Gessler] will do this operation, cost varies. If using a helicoil repair is not possible for whatever reason, there are self tapping fuel inlets available, like from [http://www.gesslerheadporting.com/gesslerheadporting/ghp.nsf/822dcaaaa26c6da985256dd80023623d/a661ef84a4b8f9f6852574fd005f54f8!OpenDocument Gessler]. | [http://www.cliffshighperformance.com/services.html Ruggles] and [http://quadrajetparts.com/rochester-quadrajet-parts-quadrajet-inlet-fittings-service-fuel-inlet-thread-repair-heli-coil-installation-inlet-carburetors-pr-356.html Gessler] will do this operation, cost varies. If using a helicoil repair is not possible for whatever reason, there are self tapping fuel inlets available, like from [http://www.gesslerheadporting.com/gesslerheadporting/ghp.nsf/822dcaaaa26c6da985256dd80023623d/a661ef84a4b8f9f6852574fd005f54f8!OpenDocument Gessler]. | ||
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