40
from a pickup located in the oil pan, then forces oil 10the
necessary engine components.
The
oil pump is driven by
the crankshaft gear.
An oil pressure relief valve regulates oil pressure at
300-400 kPa (43-57 psi). When oil pressure exceeds the
desired pressure, the reliefvalve opens and expels oil into
the liming gearcase. A low oil pressure warning light on
the instrument panel and a warn ing alarm buzzer activate
if oil pressure is below 9.8 kPa
(IA
psi).
Refer
to Chapters Five. Six and Nine for service proce-
dures.
Oil
Pressure
Test
The engine is equipped with an oil pressure warning '
light and alarm thai arc activated
if
low oil pressure oc-
curs. To verify low oil pressure, pc
rf
onn
the following oil
pressu re test.
I. Disconnect the wire lead from the oil pressure sender
(
F
i
~ u
r
e
lJ
, typical).
C
HA
P
TE
R
TW
O
2. Remove the oil pressure sender.
3. Connect a suitable oil pressure gauge.
4. Start the engine and note the oil pressure reading at idle
and wide open throttle.
5. Compare the gauge readings with the speeilicat ions in
T
abl
e 3.
Table
1
ENGINE
TROUBLESHOOTING
Trouble
Engine cr
ank
s slowly
Eng ine
will
not
crank
Engine
will
not
start
Engine sto
ps
suddenly
Probable
cau
..
Battery
fa
ulty
or
~w
charge
Faulty
starter
m
otor
Incorrect
eng
ine
011
viscosity
Discharged
battery
Corroded
battery
termin
als
loose
connection
In starting ci r
cuit
Defective
starting
switch
Starting
motor
brush
es
dirty
Jammed
starter
drive
gear
Faulty
starter
molor
Seized
engine
Empty
fuel
tank
Dirty
or
plugged
tuer f
llte
r
Air
In
inject
ion
lin
es
Faulty
fuel
feed
pump
Faulty
tuel
lnJec:tlon pump
Faulty
go
vernor
Mlsad
ju
sted
controls
Im
proper
luel i
njectIo
n
timing
P
oor
valve
seating
Damaged
cylin
der head gasket
Worn or
broken
piston ring s
Empty
fuel tank
Air
in fuel lines
(
con
t
inued)
Correction
Charge
or re
plac
e
battery
Repair
01"
replace sta
rter
m
otor
Repl ace with p
rope
r
engi
ne
oil
Charge or replace battery
Clean t
ermi
nals
Clean and ti
ght
en
all
connections
Replace switch
Clean or replace bru ehee
loosen
starter
motor
to
Iree
gear
Replace
motor
In
spe
ct and rep
air
Fill tank with pro per luel
Clean fu
ell
ilters
Bleed air In Injection lines
Repair fuel feed pump
Repair luel Injec:tlon
pum
p
Repair govern
or
Adju st speed and st
op
co
ntrols
Adju st fuel inj
ect
ion
liming
C
hec
k
101"
b
roke
n
01"
_ak
valve
springs
,
wa
rped
stems,
carbon
and gum
depos
its
and
insu
ffic
ient tappet clearance
C
hec
k
101"
leaks arou nd gasket when
engine Is cranked; if a
leak
is
fou
nd,
replace gasket
Replace
wor
n
or
brOken rings; chec k
cyli nders for
out-o
f-rou
nd and taper
Fill luel tank
Bleed fuel lines
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