SSANGYONG Rodius 2012.07 Manual page 223

2) Cleanness
(1) Cleanness of DI engine fuel system
▶
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 1,800 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 stuck 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 below figure shows the clearance between internal operating elements.
Nozzle hole
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.
Hair
Diameter
0.04 mm
Valve actuator lift - 0.028 mm
03-19
2210-01
Operating
clearance
0.002 mm
Diameter
2.0 mm