Dodge Sprinter 2006 Manual page 1712

14 - 36 FUEL INJECTION
Fig. 10 FUEL INJECTOR
1 - FUEL INJECTOR
2 - NOZZLE
3 - FUEL INLET FITTING
4 - ELECTRICAL CONNECTION
OPERA TION
Th e in ject or oper a t ion ca n be su bdivided in t o fou r
oper a t in g st a t es wit h t h e en gin e r u n n in g a n d t h e
h igh -pr essu r e pu m p gen er a t in g pr essu r e:
• In ject or closed (wit h h igh pr essu r e a pplied)
• In ject or open s (st a r t of in ject ion )
• In ject or open ed fu lly
• In ject or closes (en d of in ject ion )
Fig. 11 INJECTOR COMPONENTS
1 - INJECTOR CLOSED (AT-REST STATUS)
2 - ELECTRICAL CONNECTION
3 - TRIGGERING ELEMENT (SOLENOID VALVE)
4 - FUEL INLET (HIGH PRESSURE) FROM THE RAIL
5 - VALVE BALL
6 - BLEED ORIFICE
7 - FEED ORIFICE
8 - VALVE CONTROL CHAMBER
9 - VALVE CONTROL PLUNGER
10 - FEED PASSAGE TO THE NOZZLE
11 - NOZZLE NEEDLE
Injector closed (with high pressure applied)
Wit h t h e in ject or closed (a t -r est st a t e), t h e solen oid
va lve is n ot en er gized a n d is t h er efor e closed. Wit h
t h e bleed or ifice closed, t h e va lve spr in g for ces t h e
a r m a t u r e's ba ll on t o t h e bleed-or ifice sea t . Th e r a il's
h igh pr essu r e bu ild u p in t h e va lve con t r ol ch a m ber,
a n d t h e sa m e pr essu r e is a lso pr esen t in t h e n ozzle's
ch a m ber volu m e. Th e r a il pr essu r e a pplied a t t h e
con t r ol plu n ger 's en d fa ce, t oget h er wit h t h e for ce of
t h e n ozzle spr in g, m a in t a in t h e n ozzle in t h e closed
VA