Kohler KDI Series

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_07ED0053029590
TECHNICAL INFORMATION
2.9.1 Injection circuit (pressure 2000 bar) (Fig. 2.4)
The materials of the fuel system components (pipes, tank,
lters, etc.) and any surface treatments must be free from
chemical elements that, transported in the fuel, compromise
the operation of the injectors over time (hole clogging).
Important
• The high pressure injection system is highly susceptible to
damage if the fuel is contaminated.
• It is crucial that all components of the injection circuit are
thoroughly cleaned before the components are removed.
• Thoroughly wash and clean the engine before maintenance.
• Contamination in the injection system may cause a reduction
in in performance or engine faults.
• If the engine is cleaned with high pressure washer, then the
nozzle must be kept at a minimum distance of 200mm from
the surface, and not directed at electrical components and
connectors.
POLLUTANTS LIMIT VALUES OF PRESENCE IN FUEL
Zn
(Zinc)
. Zinc (Zn) is contained in the rubber of the supply hoses. The increase of Zinc Oxide (Zn) adheres to the
components of the injection system.
. In the event of a clogged electroinjector, it may be the high content of Zinc (Zn) causing the problem.
. The maximum allowed limit of zinco (Zn) is ≤ 3ppm
Pb
(Lead)
. Lead (Pb) is contained in the paints that coat the tanks.The increase of lead (Pb) in the fuel is deposited
on the injection components, compromising their operation.
. In the event of a clogged electro injector, it may be the high content of Lead (Pb) causing the problem.
. The maximum allowed limit of lead (Pb) is ≤ 3ppm
Na
(Sodium)
. The increase of Sodium (Na) in the fuel, adhering to the injection components in quantities ≥ 0.5 ppm
can cause electronic injector malfunctions.
. In the event of a clogged electronic injector, it may be the high content of Sodium (Na) causing the
problem.
. In this specic problem, NaOH are the residues that can be found, for example, in biofuels, Na ≥ 0.3
ppm is the limit value to prevent the problem. The combination of the two components K and Na must be
less than 0.3 ppm.
K
(Potassium)
Ca
(Calcium)
. Calcium (Ca) causes problems by adhering to the injection components.
. It is currently under study.
. Ad interim, a maximum value of 0.5 ppm is allowed when using a fuel with specication: B100 and
EN 14214 with a 10% content.
Mg
(Magnesium)
Cu
(Copper)
. Copper (Cu) in the fuel can cause irregular wear to the injection systems or clog the holes of the injec-
tors.
. In the event of a clogged injector electronic injector, it may be the high content of Copper (Cu) causing
the problem.
. Ad interim, the maximum allowed value is the same as Zn. The maximum allowed limit of Copper (Cu) is
≤ 3ppm.
Ba
(Barium)
. High contents of Barium (Ba) in the fuel can cause malfunctions in the injection systems.
. Ad interim, the maximum allowed value is the same as Zn. The maximum allowed limit of Barium (Ba) is
≤ 3ppm.
P
(Phosphorus)
. Phosphorus (P) in the fuel can cause premature wear of the catalyst.
. There are currently no contraindications for injection systems.
. Ad interim, the maximum allowed value is 1ppm when using a B100 fuel with EN 14214 specications,
with a 10% content.
Tab. 2.10
2.9 Fuel system
The most critical chemical element is Zinc (Zn), therefore it is
forbidden to use galvanised components.
Other damaging elements are indicated in the table below.