Removing Marine Engine Fuel Injectors

If your motor is complaining from the symptoms below, then the fuel injectors or related components need attention:

• Erratic RPM

• Difficulty in starting, engine dying

• Knocking noises

• White or black smoke

The reasons for the above can be attributed to:

• Contamination of the fuel or fuel lines - dirt

• Faulty washers

• Water in the fuel

• Poor maintenance

Fuel filter

Before getting to the title topic, let's go over the importance of the filters. Diesel engines operate within very fine parameters. The force and timing of the injector itself is measured at twenty thousands PSI and can be pumped up to ten times each second! For this process to run smoothly, you must make sure those filters are replaced frequently! Water and dirt contribute to deterioration of the parts.

Additives

Depending on where the diesel is distilled, different additives are used along with Sulfur. The additives can prolong the effective life of the diesel, but at the same time deteriorate the fueling components. Taking Sulfur as an example: On combustion it forms a highly corrosive gas that is absorbed by engine oil. Over time the oil becomes more toxic and needs to be changed. Keeping the filters and lines clean will go a long way to prolonging the life of the injectors.

Operational check up:

• If your engine displays the symptoms described then check fuel supply is free of air

• Look at the fuel shut off valve - is it closed?

• Remove injector lines from pumps

• Whilst turning over the starter engine, watch for splodges of fuel are shot from the injector heads

• If not, bleed the lines of air and repeat

Before removing the injectors, get a mechanic to double check the situation, this would be cheaper than replacing the injectors!

Removing the fuel injectors:

• Having taken off the lines, see whether the component will move without too much trouble. This done to maintenance. If well looked after it will be easy, if not then lubricate with deep penetrating oil and twist side to side.

• Now clean the component of all rust, combusted materials etc. Toweling is helpful.  Replace the washers.

• Replace the injector and the lines, tighten accordingly. Flush out the air from the lines and try the engine.

It's time to pour on the goodies! West Marine offer a 10% discount on orders over $100!

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