Regan Brown
Mercury Optimax fuel injectors are a unique and intricate injection system that requires both a fuel injector and an air injector. The system is sensitive, and oil never passes through the injectors, making them prone to corrosion. While some owners opt for DIY cleaning methods, it is recommended that fuel injector cleaning and maintenance be performed by a certified technician or professional service. This ensures that the job is done correctly and avoids potential damage to the engine.
| Characteristics | Values |
|---|---|
| Fuel injector removal tools | Screwdriver or cotter pin tool |
| Air injector removal tools | Air injector removal tool by Mercury |
| Fuel injector testing services | Side Feed Port Injector Service |
| Air injector testing and cleaning services | Injector-Rehab |
| Fuel injector inlet screen cleaning recommendation | Done by a professional |
| Fuel injector inlet screen replacement recommendation | Done by a professional |
| Fuel rail cleaning recommendation | Done by a certified or master technician |
| Fuel injector cleaning products | Sea Foam Marine PRO, Quickleen, 2-stroke oil |
| Fuel injector maintenance reasons | Corrosion, performance, maintenance |
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What You'll Learn
Fuel injector removal
To clean the fuel injectors of a 200 hp Mercury Optimax engine, you will first need to remove them. This can be done using a screwdriver or cotter pin tool. It is recommended that you relieve the pressure from the Schrader valves first, unhook the electrical connection, and remove the two Allen bolts before removing the injector.
The Mercury Optimax motor is very different from conventional 2-stroke engines. It uses a combination of high-pressure fuel and high-pressure air to inject an atomized mixture of gas directly into the combustion chamber. This high-pressure fuel is provided by a series of three fuel pumps, a pulse-operated lift pump, and two electric pumps inside the VST (vapor separating tank). From there, the fuel flows to the fuel rail, where it is cooled by seawater before being delivered to the fuel injectors.
- Relieve the pressure from the Schrader valves.
- Unhook the electrical connection.
- Remove the two Allen bolts that hold the injector in place.
- Remove the injector hold-down Allen screws.
- Pull the fuel injectors from the rail.
- Remove the two nuts that hold the rail to the cylinder head.
- Pull the fuel rail off the head.
It is important to note that the Optimax injectors are sensitive, especially in a saltwater boating environment. Oil does not pass through the injectors due to the oil injection system, so they are prone to corrosion. It is recommended to run a 100:1 premix in addition to the oil injection system to lubricate the injectors.
Additionally, before removing the injectors, it is important to check the ohm resistance of the injectors and replace all the seals, as they may get damaged during the removal process.
Once the fuel injectors have been removed, they can be cleaned using a variety of methods, such as sending them to a shop for professional cleaning or using a product like Sea Foam Marine PRO.
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Fuel injector testing
Fuel injectors on a Mercury Optimax engine should be cleaned and flow-tested at least once a year. This is because maintenance and fuel-related issues are the main cause of engine performance problems on the Optimax engine.
The Mercury Optimax motor is very different from conventional 2-stroke engines. Rather than injecting fuel into the crankcase, the Optimax motor uses a combination of high-pressure fuel and high-pressure air to inject an atomized mixture of gas directly into the combustion chamber. The high-pressure fuel is provided by a series of 3 fuel pumps, a pulse-operated lift pump, and 2 electric pumps inside the VST (vapor separating tank). From there, the fuel flows to the fuel rail, where it is cooled by seawater and delivered to the fuel injectors.
The air and fuel injectors are tested using Bosch-certified equipment, ultrasonically cleaned, and then re-tested for verification. The testing process involves checking the ohm resistance of the injectors.
To clean the injectors, you must first remove them. This involves relieving the pressure from the Schrader valves, unhooking the electrical connection, and removing the two Allen bolts. You will then need to remove the injector hold-down Allen screws and pull the fuel injectors from the rail.
There are also various products available that can be added to the fuel tank to clean the injectors without removing them. For example, Sea Foam Marine PRO can be added to a low tank of fuel and the engine operated for at least 20 minutes before adding more fuel.
It is important to note that fuel injection cleaners might cause more harm than good if you are already experiencing problems with your engine. If you are unsure about cleaning the injectors yourself, it is recommended to take your boat to a certified shop.
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Air injector cleaning
The Mercury Optimax engine uses a unique and intricate injection system that requires both a fuel injector and an air injector. The air injector is fed via a belt-driven air compressor, injecting pressurised air and fuel. This component is crucial to the engine's performance and must function correctly.
Air injectors are prone to corrosion, especially in saltwater boating environments, due to the oil injection system bypassing the injectors. To prevent this, some recommend running a 100:1 premix to lubricate the injectors.
It is recommended to clean the air injectors annually or after every 100-150 hours of engine operation. This can be done by sending them out to a service, which will test flow rates at idle and wide open. The air injectors can be removed with a specialised tool from Mercury.
Alternatively, some choose to clean their air injectors themselves. This can be done by adding a full can of Marine PRO to a low tank of fuel and operating the engine for at least 20 minutes. Another option is to add Quickleen to a test tank and running it through the engine.
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Fuel injector inlet screen cleaning
- Before beginning any work, it is important to relieve the pressure from the Schrader valves to ensure safety.
- Unhook the electrical connection to the fuel injector.
- Remove the two Allen bolts that secure the injector in place.
- Carefully remove the injector from the fuel rail.
- Clean the inlet screen: This step should be done with care and attention to detail. Use a soft brush or compressed air to gently remove any built-up debris or residue on the screen. Ensure that the screen is completely free of any foreign material.
- Reinstall the injector: Once the inlet screen is spotless, carefully reassemble the injector in the reverse order of removal. Ensure that all connections are secure and that there is no damage to any components, especially the O-rings.
- Test the engine: After cleaning and reassembling, start the engine and observe its performance. Pay attention to any unusual noises or changes in performance.
It is important to note that fuel injector cleaning and maintenance can be complex, and it is always recommended to consult a certified technician or mechanic if you are unsure about any part of the process. Additionally, some sources suggest sending the injectors to a reputable shop for professional cleaning and testing.
As an alternative to manual cleaning, some products, such as Sea Foam Marine PRO, can be added directly to the fuel tank to clean the injectors without disassembly. This method involves adding a full can of Marine PRO to a low tank of fuel (about 1/4 tank) and then operating the engine for at least 20 minutes before refuelling.
By following these steps and taking the necessary precautions, you can help ensure that your Mercury Optimax fuel injectors are clean and functioning properly.
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Fuel rail cleaning
To clean the fuel rail on your Mercury Optimax engine, it is recommended to seek the services of a certified technician or marine engineer. They will have the appropriate tools and expertise to safely and effectively clean the fuel rail without causing any damage.
The process of cleaning the fuel rail typically involves removing the fuel injectors and then cleaning the rail itself. This is a delicate procedure, as the injectors and the rail are sensitive components. The first step is to relieve the pressure from the Schrader valves. Next, you will need to unhook the electrical connection and remove the injector hold-down Allen screws. With the screws removed, you can then pull out the fuel injectors from the rail.
With the injectors removed, you can focus on cleaning the fuel rail. It is important to use the correct tools and cleaning solutions to avoid causing any damage. A certified technician will have the necessary equipment to clean the rail thoroughly and safely.
In addition to cleaning the fuel rail, it is also recommended to clean or replace the fuel injector inlet screens. These screens can become clogged with debris, which can then enter the injectors and cause issues with their performance. Again, this is a delicate task that should be left to a professional to ensure it is done correctly and safely.
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Frequently asked questions
It is recommended that you send your fuel injectors to a professional for cleaning. However, if you want to clean them yourself, you can follow these steps:
- Remove the injector hold-down Allen screws and pull out the 6 fuel injectors from the rail.
- Remove the two nuts that hold the rail to the cylinder head, then pull the fuel rail off the head and remove the 6 direct injectors.
- Clean the fuel injectors using a product such as Sea Foam Marine Pro or Quickleen.
- Reinstall the injectors, lubricating the O-rings with a small amount of outboard 2-stroke oil.
Fuel injectors can become corroded or clogged over time, especially in a saltwater environment. Cleaning them helps to ensure optimal performance and prevent running issues.
It is recommended to clean your fuel injectors every 300-500 hours of engine operation or every 2-3 years, whichever comes first.
Some signs that your fuel injectors may need to be cleaned include decreased performance, skipping or missing at idle, and decreased RPM.
No, it is recommended that you send your air injector to a professional service for cleaning and flow testing. The air injector is a critical component that must be working correctly, and it has a higher-than-normal failure rate.
