Weber carburettors are used to regulate the mixture of fuel and air that is drawn into the cylinders to be combusted. It is important for a carburettor to be installed properly, because an improper installation can cause a car to run roughly, fail at a later time or simply not start in the first place. On the bright side, it is not a challenging job. Anyone on any skill level can install a Weber carburettor, as long as they stick to the instructions and do not deviate or skip any steps. These instructions assume that you have already removed the previous carburettor and are ready to begin installing your replacement Weber carburettor.
- Skill level:
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Things you need
- Gasket (comes with carburettor kit)
- Torque wrench
Prepare your engine to receive the new carburettor by installing the gasket and shim (if applicable). The gasket is installed by simply setting it into place. There is no sealant or glue that should be used for this process. The pressure provided by the Weber carburettor will be enough to hold everything down. Make sure the gasket is placed in the proper direction to ensure a good seal.
Slide the carburettor into place on top of the gasket, but do not tighten it down yet. While it is in place, check the movement of the throttle linkage. Manually move it back and forth several times to ensure there is no unusual resistance or any other problems. If everything looks good, replace all of the linkages, hoses and wires in the same manner that they came off the old carburettor. Now is a good time to inspect all of them for any visible signs of wear, such as cracks or worn connectors.
Tighten the Weber carburettor into place using a torque wrench. The proper torque specs are between 7 and 10 foot-pounds of torque. This is adequate to hold the carb into place, while any more pressure could potentially warp the base of the carb, resulting in a diminished connection at the gasket.
Start the car. Since the carburettor is new, it may take several attempts before it comes to life. Once the car has started, allow it to warm up for a minute, then begin to adjust the idle setting. To do so, turn the air conditioning on (to provide a light load), and simply turn the idle screw with a screwdriver until the proper idle is reached. The proper range is 700 to 900rpm. As long as the car sounds as if it's running smoothly, anywhere within this range is just fine.
Tips and warnings
- Before installing, make sure you have the right carburettor. Many different carburettor styles will fit on a single engine, but it may not function properly if it's not the right one.
- Be careful when working around an open fuel line. Avoid tools that produce a spark or flame, and do not smoke around the vehicle.
- When adjusting the idle speed, keep your hands clear of any moving engine parts.
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