Cooling System; Radiator; Thermostat; Water Pump - Kubota L185 Shop Manual

SHOP MANUAL
Paragraphs 53-58
emerging in a straight axis fronni nozzle
tip. If pattern is wet, ragged or intermit-
tent, nozzle must be overhauled or
renewed.
53. OVERHAUL. Hard or sharp
tools, emery cloth, wire brush or grin-
ding compound must never be used. An
approved nozzle cleaning kit is available
through a number of specialized sources.
Wipe all dirt and loose carbon from ex-
terior of nozzle assembly. Secure nozzle
in a soft-jawed vise or holding fixture
and remove nozzle nut (10-Fig. 63).
Carefully separate parts and place in
clean calibrating oil or diesel fuel as they
are removed. Be sure parts from each
injector are kept together and separate
from other units.
Clean exterior surfaces with a brass
wire brush, soaking in an approved car-
bon solvent, if necessary, to loosen hard
carbon deposits. Rinse parts in clean
diesel fuel immediately after cleaning to
neutralize the solvent and prevent etch-
ing of polished surfaces.
Clean nozzle spray hole from inside us-
ing a pointed hardwood stick. Scrape
carbon from pressure chamber using
hooked scraper. Clean valve seat using
brass scraper. Reclean all parts by rins-
ing in clean diesel fuel. Check nozzle fit
by holding nozzle body vertically and lift-
ing needle valve up about V 3 of its
length, then release needle. Needle must
slide to its seat by its own weight. If nee-
dle movement is rough or sticky, reclean
or renew nozzle valve assembly as
necessary.
Reassemble injector while parts are
immersed in diesel fuel to avoid con-
tamination. Make sure pressure ad-
justing shim (5) is in place. Tighten noz-
zle nut to a torque of 59-78 N-m (44-58
ft.-lbs.). Do not overtighten as distortion
may cause nozzle valve to stick and no
amount of overtightening can stop a
leak caused by scratches or dirt. Retest
injector as previously outlined.
GLOW PLUGS
All Models
54. One glow plug is provided in
precombustion chamber of each
cylinder. To check glow plugs, discon-
nect wiring cable from glow plug ter-
minal, then connect an ohmmeter across
glow plug terminal and body. Resistance
should be approximately 1.5 ohms. If
resistance is zero ohms, glow plug is
shorted. If resistance is infinite, an open
circuit exists in glow plug.
COOLING
SYSTEM
55. All models use a pressurized cool-
ing system which raises coolant boiling
point. All models except LI85 use an im-
peller type centrifugal pump to provide
forced coolant circulation and a ther-
mostat to stabilize operating
temperature.
Model LI85 uses natural circulation in
which the relative density of hot and
cold liquid provides the means of coolant
circulation. No coolant pump or ther-
mostat is used in this system. It is of ut-
most importance that coolant level be
maintained at a level which fully covers
upper coolant hose inlet elbow.
RADIATOR
All Models
56. Radiator cap pressure valve is set
to open at 88.3 kPa (12.8 psi) on all
models. Some models are equipped with
a whistle-type warning device attached
to radiator overflow pipe. Make sure
whistle is operative and properly con-
nected to radiator.
To remove radiator, first drain coolant
and remove hood. Disconnect radiator
hoses and air cleaner hose. Remove
mounting cap screws, then lift radiator
from tractor.
THERMOSTAT
All Models Except L185
57. On models so equipped, the by-
pass type thermostat is located in
coolant outlet elbow. Thermostat should
begin to open at about 82°C (180°F) and
be fully open at 95°C (203°F).
WATER PUMP
All Models Except L185
58. R&R AND OVERHAUL. Refer
to appropriate Fig. 64, 65 or 66 for an
exploded view of water pump. To
remove pump, drain cooling system and
remove radiator, if necessary, for access
to pump. Remove fan belt, then unbolt
and remove water pump.
To disassemble pump, remove fan
pulley using a suitable puller. Unseat
pump shaft bearing front retaining ring,
then press shaft and bearings forward
out of impeller and pump body. Remove
seal assembly from pump body.
All water pump parts are available in-
dividually. To reassemble pump, reverse
the disassembly procedure. On pumps
equipped with fan pulley retaining nut,
tighten nut to a torque of 70-78 N-m
(50-58 ft.-lbs.).
in L^Lli
1 1 1
I
1
I
1
r
Fig. G3—Exploded view of injector unit used on
all models.
1. Nut
2. Bv-pass fittin^^
•S. Washer
4. Pressure fittin^^
5. Shim
H Snrinti
1. Push nKf
8. Spacer
iK Nozzle & valve
U). N(»zzel nut
F/g. 64~-Exploded view of
water pump used on Models
L235, L275 and L355.
1. Pulley
2. Hub *
3. Retainer
•1. Shaft & bearinj^ a.ssy.
B.' Bndy
7. (iHsket
H. Seal assv.
9. Impeller
27