Lep SM470B1002-1EN
Issued 03-2010
1002-7
Engine fuel, maintenance of fuel filters and fuel storage
In order to meet the emission control regulation of 3rd-stage, the engine components have been made precisely and
they are to be used under high-pressure conditions.
Therefore, the specified fuel must be used for the engine.
As a matter of course, not only the guarantee will not be given for the use of a fuel other than the specified but also it
may invite a serious breakdown.
In addition, since suitable specifications for the fuel filter elements have been established for this engine, use of the gen-
uine filter is essential.
The following describes the specifications and the requirements of the fuel to be applied, and maintenance of the fuel
and the fuel elements.
Fuel to be applied
Selection of fuel
Following conditions must be met for the diesel engines, that is the one;
1 In which no dust even fine one is mixed,
2 With proper viscosity,
3 With high cetane rating,
4 With good flow properties in lower temperature,
5 With not much sulfur content, and
6 With less content of carbon residue
Applicable standards for diesel fuel
If a standard applied to the fuel for the diesel engine is stipulated in your country, check the standard for details.
Requirements for diesel fuel
Although conditions required for the diesel fuel are illustrated above, there are other requirements exerting a big
influence on its service durability and service life.
Be sure to observe the following requirements for selecting fuel.
Sulfur content .............................................................................. 2500 ppm or less
HFRR* ......................................................................................... 460 mm or less
Water content .............................................................................. 0.05 wt% or less
* HFRR (High-Frequency Reciprocating Rig.): An index showing lubricating properties of the fuel.
Sulfur content reacts to moisture to change into sulfuric acid after combustion.
Use of a fuel containing much sulfur content allows it to accelerate internal corrosion and wear.
In addition, much sulfur content quickens deterioration of engine oil allowing its cleaning dispersive property to be
worse which results in acceleration of wear of sliding portions.
HFRR is an index that indicates lubricating property of a fuel.
Large value of the index means poor lubrication so that seizure of the machine components may result if such a
fuel is used.
Since a fuel with high HFRR value also has lower viscosity, it can easily be leaked out.
Applicable Standard
Recommendation
JIS (Japanese Industrial Standard)
NO.2
DIN (Deutsche Industrie Normen)
DIN 51601
SAE (Society of Automotive Engineers)
Based on SAE-J-313C
NO. 2-D
BS (British Standard)
Based on BS/2869-197
Class A-1
EN590
