Bulletin Today, February 19, 1982
by Roberto C. Bernardo
(The author is general service manager of Malabon Diesel Injection Service Center of the Philippines, franchised holder and official servicing agent in the Philippines of Diesel Kiki Co., Ltd. of Japan. He has had extensive training with the Japanese firm, largest maker of injection pumps in Japan and NO. 3 in the world. With his know-how in diesel engines and 15 years' experience in servicing injection pumps, he has conducted seminars for fleet owners and PCMP members and their dealers.)
Fuel injection equipment, which include the injection pump, is a combination of complex mechanical devices consisting of several hundreds of parts. It is auxillary to a diesel engine and the engine is part of a system.
The author will not attempt to involve the readers in a complex narration of facts but rather try to give the readers of diesel users some pointer on how to better enjoy the use of diesel- fueled- engines by giving tips on the care of the most sensitive part of the engine – the fuel injection equipment, including the injection pump which has been called the heart of the engine.
Here are some diesel engine care tips:
For excellent diesel engine performance, fuel oil of good quality shoul be used. Bad fuel tends to degrade the engine as well as the nozzle and injection pump in the injection system.
The nozzle plunger, and delivery vave are lubricated by the fuel oil so that if the fuel oil is not good, it accelerates wearing of these parts.
Fuel oil of low viscosity causes seizure of the nozzle, plunger, and delivery valve. Conversely, with fuel oil of high viscosity, oil particles injected from the nozzle become greater in size, resulting in incomplete mixture with air, so that good combustion is hardly obtainable.
Fuel oil with great sulfur content generates, upon combustion, so much sulfur dioxide gas which mixes with moisture in the combustion chamber to produce sulfuric acid. This causes corrosion of the nozzle and other parts.
Fuel oil with a mixture of moisture causes seizure or rust in the nozzle, plunger and delivery valve.
When fuel oil containing much residual carbon is used, carbon is deposited on the tip end of the nozzle and thus degrades the spraying condition.
Fuel oil generally contains various kinds of impurities , although they are not visible to the naked eye. Such fuel oil causes difficulties as stated above. Here, filtration of the fuel oil becomes important.
If the fuel tank is stained, the fuel oil becomes polluted so that it is important to clean the fuel tank periodically with gasoline or light oil.
The filter must be changed or cleaned at the specified running mileage (or time).
Next week: Common Symptoms of Fuel Injection Equipment Problems.