Cleanness - SSANGYONG KYRON 2010.01 Manual

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11. CLEANNESS

1) Cleanness of di engine fuel system and service procedures
The fuel system for DI engine consists of transfer (low pressure) line and high pressure line.
Its highest pressure reaches over 1600 bar.
Some components in injector and HP pump are machined at the micrometer 100 μm of
preciseness.
The pressure regulation and injector operation are done by electric source from engine ECU.
Accordingly, if the internal valve is stucked due to foreign materials, injector remains open.
Even in this case, the HP pump still operates to supply high pressurized fuel. This increases the
pressure to combustion chamber (over 250 bar) and may cause fatal damage to engine.
You can compare the thickness of injector nozzle hole and hair as shown in below figure (left
side).
The right side figure shows the clearance between internal operating elements.
The core elements of fuel system has very high preciseness that is easily affected by dust or
very small foreign material. Therefore, make sure to keep the preliminary works and job
procedures in next pages. If not, lots of system problems and claims may arise.
ENGINE D20DT
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