Checking And Servicing; Reassembly; Verification - Yanmar YSE8 Service Manual

4)
Take off the fuel injection valve spring holder, taking care not to drop the nozzle spring
adjusting plates.
Checking & Servicing
Check point
Remed]
Part code
NozzIe valve.
Dusty, stuck,
scratched or worn.
I
2
Clean if dusty.
Clean or renew if
stuck.
Renew if
scratched.
Renew if worn.
YSES
YSE12
Nozzle
valve
1 7 2 1 0 0 - 5 i 0 0 0
Remark: Common to all models.
t
ReasBembly
Verification
After completion of the reassembly, verify that the injection pressure and the spray
nonnal or as rated. A nozzle tester simplifies the verification. but if itrs not
to left and
fit the tuel injection valve and swing the V pulley of the power take-off shalt
right.
venting is necessar'y.
l) Attach tbe inter spildae. sti'ing seat, nozzle spring, adjusting plate, packing, and
nozzle spdng holder.to the fuel injection valve body. Be sure of the spring side of
the spdng seat, and do not drop the spring adjusting plates-
)
Attach the nozzle valve and the nozzle bod! to the fuel injection valve bodJ
)
Vise the fuel injection valve and tighten various parts.
from are
available,
Injection
pressure
not normal.
1. Juclgement using nozzle tester.
2, Judgement without using nozzle
tester.
(Low pressure: large fuel
particle size, or bad exhaust
color. ).
High pressure: small fuel particle
aize, or knocking,
Adjust to 160 kg/cmz.
* Adjusting plate thickness and
pressures
Y S E S
Y S E 1 2
Nozzle
spnng
adjusting
plate
1 r 0 2 5 0 - 5 3 1 5 0
Sold in sets.
I
2t
Check point
Judging criterion & remedy