Excessive Exhaust Smoke - Toyota 3b Repair Manual

EM-lO ENGINE MECHANICAL
-
Diesel Engine Diagnosis
HINT:
Overflow screw
is
marked
"OUT"
and has
an inner
jet. Althogh both fittings
are same size,
they must not
be
interchanged.
INTERCHANGED OVERFLOW
SCREW
(OUT)AND
INLET
(NO MARK)
FITTING
Refer
to item
3
of ROUGH
IDLE
WITH
WARM
ENGINE.
5.
CLOGGED FUEL FILTER Disconnect
inlet
hose to
fuel filter and feed clean fuel
directly into the pump.
lf
the engine condition improves, the fuel filter
is
clogged and should be replaced. (See
page
FU-4)
HINT:
When feeding fuel directly into the pump,
keep
container at same level
as
vehicle fuel tank.
lf
no increase in engine
condition after replacing the
fuel filter, check the priming pump or perform other
necessary repairs.
IMPROPER INJECTION
TIMING
Refer
to item
9 of ENGINE CRANKS
NORMALLY
BUT
WILL
NOT START.
7.
FAULW INJECTION
NOZZLE
Refer
to item
11
of
ENGINE CRANKS NORMALLY
BUT
WILL
NOT START.
EXCESSIVE EXHAUST SMOKE
HINT:
1.
Check that the air cleaner is not clogged.
2. Check
with the customer whether or not oil consumption has been excessive.
(Possible Cause)
(Check Procedure and Correction Method)
1.
IMPROPER INJECTION
TIMING
Refer
to item 9 of
ENGINE CRANKS
NORMALLY
BUT
WILL NOT
START.
HINT:
Black smoke indicates advanced
timing
while white smoke indicates retarded timing.
Adjustments should
be
made accordingly.
Refer
to item
5
of IACK
OF POWER.
HINT:
At
high speed
(2,OOO
-
3,OOO
rpm),
a
clogged
filter
tends
to
make the exhaust smoke
white.
2.
CLOGGED FUEL FILTER
3.
FAULW INJECTION
NOZZLE Refer
to item 11 of ENGINE CRANKS
NORMALLY
BUT
WILL
NOT
START.
HINT:
Excessive
exhaust smoke is often caused
by nozzle pressure being too low.