Valmet 611 - Fuel system construction and operation overview; Injection pump Bosch A operation

COT{SIRI'CTION
ATD
OFERATIO
OF FUEL
SYSIEI,I
l. Fuel
iank 2. Y
ater
seDara+or 5. Feed
4.
Fllter 5. InJecilon
pump
6. InJecfor
7. Fugl reservolr
of thermosiari
devlce
8. olor
plug
9. overflow
valve
The fuel flotrs lrom
the iank
(l)
vla
separator
(2)
to the teird
punp
(i)
whlch
the
hlgh-pressurlzed
fuel +hrough
the
(4)
io ihe InJectlon
puitp
(5).
TilJECIt(r{
PtfP 8601
'Ai
l.0ll flller
plug
2. Spe€d lever l. Hand
pump
4,
Lube ol I lnio the lnJec+lon
pump
5.
O-rlng seal 6.
Lube
oll back
to tho englne
7.
Gear 8.
lden+lflcatlon ola+e
The-
InJec+lon pump
ls
an
In-llne
pump
and lfs
baslc
cons+rucilon
ls
the same
In all
enqlnes
lrrespectlve
of the
cvllnder
number.
punP
vaTer
forces
f
I lfer
The lnJectlon
punp pumps
the fuel
through lhe
InJec+lon
plpes
lnto +he lnJectors
(6)
,hlch
spray +he
fuel
Inio
the
cyllnders
ln
a flne
spray.
The excess
fuel rlhlch lubrlcates
ihe
nozzle
needle reiurns
from the InJectors to
+he
fuel
reservolr of lhe thermostart
devlce
(7)
and
on
to the luel tank. Durlng
gloyrlng
lhe fuel
runs
from +he reservolr
(7)
+hrough +herdps+art
glovr
plug
(8)
and
ihen burns In fhe lnle+
manlfold.
The excess
fuel
fron the lnJecilon
pump
reiurns
fhrough overf lov, valve
(9)
In+o
ihe fuel +,ank.
9- 3