Check Valve Description; Operation; Removal; Installation - Dodge Sprinter 2006 Manual

VA
CH ECK VALV E
DESCRIPTION
Fig. 4 Check Valve
1 - INLET NIPPLE
2 - CHECK VALVE
3 - OUTLET NIPPLE (2)
A sin gle wa sh er syst em ch eck va lve is st a n da r d
equ ipm en t on t h is m odel, a n d is in st a lled in t h e
wa sh er syst em plu m bin g (F ig. 4). Th e ch eck va lve is
in t egr a l t o t h e wa sh er plu m bin g fit t in g loca t ed on
t h e u n der side of t h e cowl t op pa n el beh in d t h e r ea r
of t h e h ood pa n el open in g in t h e en gin e com pa r t -
m en t . Th e ch eck va lve con sist s of a m olded pla st ic
body wit h t h r ee ba r bed h ose n ipples, on e a t t h e in let
side of t h e va lve body a n d t wo a t t h e ou t let side. Th e
ch eck va lve ca n n ot be a dju st ed or r epa ir ed a n d, if
fa u lt y or da m a ged, it m u st be r epla ced.
OPERA TION
Th e ch eck va lve pr ovides m or e t h a n on e fu n ct ion
in t h is a pplica t ion . It ser ves a s a plu m bin g con n ect or
fit t in g bet ween t h e en gin e com pa r t m en t a n d wa sh er
n ozzle sect ion s of t h e wa sh er su pply h ose. It pr even t s
wa sh er flu id fr om dr a in in g ou t of t h e wa sh er su pply
h oses ba ck t o t h e wa sh er r eser voir. Th is dr a in -ba ck
wou ld r esu lt in a len gt h y dela y fr om wh en t h e
wa sh er swit ch is a ct u a t ed u n t il wa sh er flu id wa s dis-
pen sed t h r ou gh t h e wa sh er n ozzles, beca u se t h e
wa sh er pu m p wou ld h a ve t o r efill t h e wa sh er plu m b-
in g fr om t h e r eser voir t o t h e n ozzles. Su ch a dr a in -
ba ck con dit ion cou ld a lso r esu lt in wa t er, dir t , or
ot h er ou t side con t a m in a n t s bein g siph on ed in t o t h e
wa sh er syst em t h r ou gh t h e wa sh er n ozzle or ifice.
Th is wa t er cou ld su bsequ en t ly fr eeze a n d plu g t h e
n ozzle, wh ile ot h er con t a m in a n t s cou ld in t er fer e wit h
pr oper n ozzle oper a t ion a n d ca u se im pr oper n ozzle
spr a y pa t t er n s. In a ddit ion , t h e ch eck va lve pr even t s
wa sh er flu id fr om siph on in g t h r ou gh t h e wa sh er n oz-
zles a ft er t h e wa sh er syst em is t u r n ed Off.
Wh en t h e wa sh er pu m p pr essu r izes a n d pu m ps
wa sh er flu id fr om t h e r eser voir t h r ou gh t h e wa sh er
plu m bin g, t h e flu id pr essu r e u n sea t s a dia ph r a gm
fr om over a su m p well wit h in t h e va lve by over r idin g
t h e spr in g pr essu r e a pplied t o it by a pist on . Wit h
t h e dia ph r a gm u n sea t ed, wa sh er flu id is a llowed t o
flow t owa r d t h e t wo wa sh er n ozzles. Wh en t h e
wa sh er pu m p st ops oper a t in g, t h e spr in g pr essu r e on
t h e pist on sea t s t h e dia ph r a gm over t h e su m p well in
t h e va lve a n d flu id flow in eit h er dir ect ion wit h in t h e
wa sh er plu m bin g is pr even t ed. Th e ch eck va lve ca n -
n ot be a dju st ed or r epa ir ed a n d, if fa u lt y or da m a ged,
it m u st be r epla ced.

REMOVAL

(1) Un la t ch a n d open t h e h ood pa n el.
(2) Discon n ect t h e wa sh er h oses fr om t h e t h r ee
ba r bed n ipples of t h e ch eck va lve u n it (F ig. 5).
Fig. 5 Check Valve Remove/Install
1 - COWL HOOD SEAL
2 - CHECK VALVE
3 - HOSE TO WASHER NOZZLE (2)
4 - HOSE FROM WASHER PUMP
(3) Rem ove t h e ch eck va lve u n it fr om t h e u n der-
side of t h e cowl t op pa n el.
INSTALLA TION
(1) P osit ion t h e ch eck va lve u n it t o t h e u n der side
of t h e cowl t op pa n el (F ig. 5).
(2) Recon n ect t h e t h r ee wa sh er h oses t o t h e
ba r bed n ipples of t h e ch eck va lve u n it .
(3) Close a n d la t ch t h e h ood.
WIPERS/WASHERS 8R - 11