- Joined
- Mar 1, 2000
- RO Number
- 6
- Messages
- 231
CARBURETOR REMOVAL & INSTALLATION
A large portion of marine engine carburetors can be grouped up into 14 models. These fit most 2 & 4 barrels, and fit a variety of Mercruiser and OMC applications. Those of you who prefer to use a carburetor for mixing fuel and air as opposed to an EFI system, may find this information useful when rebuilding or installing a remanufactured carburetor. By using a remanufactured carburetor, one does not have to mess with the hassle of rebuilding their existing carburetor. However, using a remanufactured carburetor does not eliminate all of the work. One still has to remove their existing carburetor and replace it with the fresh piece. This is not a difficult job, just one that requires a little time and patience.
The first step in replacing your carburetor is to look at your existing carburetor. Take note of how the fuel lines, throttle linkage, choke linkage, flame arrester, and any other accessories (i.e. separator line) are connected. This step will make re-installing everything on the remanufactured carburetor easier. Next, carefully begin removing all such items. Use care when removing the fuel line, as gas may leak form the line and the carburetor. It is best to have a rag or towel handy to quickly clean any spill. Also, use caution when removing the throttle and choke linkage. Care here, will eliminate the need to run to the local marine dealership to replace a lost or damaged linkage component.
Once all the accessories are removed, you are ready to unbolt the carburetor from the intake manifold. A good combination open/box end wrench is the tool of choice for removing the carburetor bolts or nuts. Now, you are ready to remove the old carburetor. Carefully lift the carb from the intake. Use care not to drop anything down the now exposed intake port. With the carburetor now removed, carefully remove the old mounting gasket. You might need to clean the gasket mating service with a wire brush or gasket removing tool, being careful not to mar the surface. When doing so, place a rag in the intake opening to keep out any debris.
At this point you will either have the removed unit rebuilt or procure a remanufactured unit.
Before you begin to install the carburetor, make sure all of your remanufactured components compare to the equipment that you just removed. If not, recheck your applications and part numbers. Once you have verified that your parts are correct, you may begin to install your carburetor.
Start installation by placing the new mounting gasket on the intake manifold. Then, carefully place the remanufactured carburetor on the intake. Take time to make sure the carburetor base is setting flat on the intake with nothing caught underneath the base. When completed, reinstall and tighten the carburetor bolts or nuts to manufacturer specifications. Do this in an even pattern to prevent warping or twisting of the baseplate. Once the carburetor has been tightened down, reconnect the fuel line, throttle linkage, flame arrester, and choke linkage. Once completed, check to make sure that all linkages are working correctly with no apparent binding or sticking.
Now that you have completed installing your remanufactured carburetor, it is time for the initial startup. Most remanufactured carburetors have been preset for initial operation. Remember, the remanufactured carburetor is completely void of gas, therefore it may require a little extra engine cranking before the engine fires. Once the engine is running, check the carburetor and fuel lines for leaks. After allowing the engine to run up to normal operating temperature, you will need to adjust the carburetor for optimum performance. Refer to manufacturers specifications when fine-tuning your carburetor. It should provide trouble -free service.
A large portion of marine engine carburetors can be grouped up into 14 models. These fit most 2 & 4 barrels, and fit a variety of Mercruiser and OMC applications. Those of you who prefer to use a carburetor for mixing fuel and air as opposed to an EFI system, may find this information useful when rebuilding or installing a remanufactured carburetor. By using a remanufactured carburetor, one does not have to mess with the hassle of rebuilding their existing carburetor. However, using a remanufactured carburetor does not eliminate all of the work. One still has to remove their existing carburetor and replace it with the fresh piece. This is not a difficult job, just one that requires a little time and patience.
The first step in replacing your carburetor is to look at your existing carburetor. Take note of how the fuel lines, throttle linkage, choke linkage, flame arrester, and any other accessories (i.e. separator line) are connected. This step will make re-installing everything on the remanufactured carburetor easier. Next, carefully begin removing all such items. Use care when removing the fuel line, as gas may leak form the line and the carburetor. It is best to have a rag or towel handy to quickly clean any spill. Also, use caution when removing the throttle and choke linkage. Care here, will eliminate the need to run to the local marine dealership to replace a lost or damaged linkage component.
Once all the accessories are removed, you are ready to unbolt the carburetor from the intake manifold. A good combination open/box end wrench is the tool of choice for removing the carburetor bolts or nuts. Now, you are ready to remove the old carburetor. Carefully lift the carb from the intake. Use care not to drop anything down the now exposed intake port. With the carburetor now removed, carefully remove the old mounting gasket. You might need to clean the gasket mating service with a wire brush or gasket removing tool, being careful not to mar the surface. When doing so, place a rag in the intake opening to keep out any debris.
At this point you will either have the removed unit rebuilt or procure a remanufactured unit.
Before you begin to install the carburetor, make sure all of your remanufactured components compare to the equipment that you just removed. If not, recheck your applications and part numbers. Once you have verified that your parts are correct, you may begin to install your carburetor.
Start installation by placing the new mounting gasket on the intake manifold. Then, carefully place the remanufactured carburetor on the intake. Take time to make sure the carburetor base is setting flat on the intake with nothing caught underneath the base. When completed, reinstall and tighten the carburetor bolts or nuts to manufacturer specifications. Do this in an even pattern to prevent warping or twisting of the baseplate. Once the carburetor has been tightened down, reconnect the fuel line, throttle linkage, flame arrester, and choke linkage. Once completed, check to make sure that all linkages are working correctly with no apparent binding or sticking.
Now that you have completed installing your remanufactured carburetor, it is time for the initial startup. Most remanufactured carburetors have been preset for initial operation. Remember, the remanufactured carburetor is completely void of gas, therefore it may require a little extra engine cranking before the engine fires. Once the engine is running, check the carburetor and fuel lines for leaks. After allowing the engine to run up to normal operating temperature, you will need to adjust the carburetor for optimum performance. Refer to manufacturers specifications when fine-tuning your carburetor. It should provide trouble -free service.