How to rebuild a Rochester Quadrajet 4MV carburetor
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=====Throttle blade screw replacement===== | =====Throttle blade screw replacement===== | ||
| − | As mentioned above, the screws can be enlarged to 6-32 if need be. The factory stakes the screws to retain them from falling into the engine, you should do the same. | + | As mentioned above, the screws can be enlarged to 6-32 if need be. The factory stakes or peens the screws to retain them from falling into the engine, you should do the same (the end of the screw has to protrude past the shaft to do this). |
| − | To do the staking, you can clamp a piece of square stock into a vice to use as an anvil to support the screw head on, then peen the ends of the screws with a small jeweler's hammer or ball peen. You don't need to simulate the factory way of staking; the main idea is to disrupt the threads on the end of the screw so they cannot fall into the engine. The loctite will do the rest. | + | To do the staking, you can clamp a piece of square stock into a vice to use as an anvil to support the screw head on, then peen the ends of the screws with a small jeweler's hammer or ball peen. You don't need to simulate the factory way of staking; the main idea is to disrupt the threads on the end of the screw so they cannot fall into the engine. The loctite will do the rest; the blue formula works good. Be careful to not hit the ends of the screws unless the head of the screw is supported against something solid. You don't want to bend the shaft. |
| + | [[File:Vise grip.jpg|right]] | ||
| + | Alternatively, you can use a pair of clamping vise grips to get the jaws on both ends of the screw. This can disrupt the ends of the screws enough to keep them from falling into the engine. | ||
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If the ends of the screws look too long, they can be ground down with a dremel or small file to the approximate length of the stock screws before peening them. | If the ends of the screws look too long, they can be ground down with a dremel or small file to the approximate length of the stock screws before peening them. | ||
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