•
5JL
(DIESEL)
ENGINES
9
- 19
Fig.
11
Cylinder
Head/Gasket
Alignment
(5)
Use
clean engine oil
to
lubricate
the
cylinder
head
bolt
threads
and under
the
bolt
heads.
(6)
The cylinder head bolts
are 3
different
sizes.
In-
stall
the bolts in the proper hole. Tighten the bolts
as
follows:
•
Step
1—Tighten all bolts, in
sequence
(Fig. 12),
to
90
N-m
(88 ft. lbs.) torque. Check the torque.
If
lower
than 90 N-m (66 ft.
lbs.),
tighten
to
this torque.
•
Step
2—Tighten all 12 mm bolts, in
sequence
(Fig.
12),
to 120 N-m (89 ft. lbs.) torque. Check the torque.
If
lower than
120
N-m
(89 ft.
lbs.),
tighten
to
this
torque.
•
Step
3—Tighten all bolts, in
sequence
(Fig. 12),
an
additional
90°.
J9109-36
Fig.
12
Cylinder Head Tightening Sequence
(7)
Be
sure
to
lubricate
the
push rod
sockets
with
clean engine oil.
(8)
Install
the
rocker lever pedestal bolts
and
tighten
to
24 N-m (18 ft. lbs.) torque.
(9)
Adjust
the
valve clearance.
(10)
Install
the
valve covers. Tighten
the
bolts
to
24 N-m (18 ft. lbs.) torque.
(11)
Install
the injector nozzles and
fuel
lines (refer
to
Group 14, Fuel System).
(12)
Install
the
fuel
filter
(refer
to
Group 14, Fuel
System for the proper procedures).
(13)
Install
the
exhaust
manifold
(refer
to
Group
11,
Exhaust System and Intake
Manifold).
(14)
Install
the
turbocharger.
(15)
Connect the radiator and
heater
hoses.
(16) Fill
the
engine
with
new coolant
or the
clean
drained coolant (refer
to
Group 7,
Cooling
System for
the proper procedure).
(17) Fill
the engine
with
clean
lubricating
oil
(refer
to
Group
0,
Lubrication and Maintenance).
PISTON/CONNECTING ROD
ISSEilLY
The turbocharged intercooler piston has
a
Ni-Resist
insert
with
a
keystone
profile
for the
top
compression
ring.
The new piston
has a
new design
bowl
and a
7
mm
longer piston pin. The 1991V2 pistons can not
be
interchanged
with
earlier models.
PISTON
COOLING NOZZLES
The piston cooling nozzles (Fig. 13)
on the
1991V2
engine
are a
new design
with
increased
flow
capabil-
ities.
The 1991V2 piston
cooling
nozzles
can
not
be
in-
terchanged
with
earlier models.
Fig.
13
Piston
Cooling
Nozzles
OIL
PU1P
The 1991V2 oil pump can
be
used on earlier model
engines. However, earlier oil pumps can not
be
used
on
1991V2
engines.
OIL
PRESSURE
REGULATOR
VALVE/SPRING
When
oil
pressure
from
the
oil pump
exceeds
448
kPa (65 psi), the regulator valve
opens
to
allow
oil
to
drain
back into
the
pan.
OIL
COOLER
ELE1ENT/G1SKET
The
1991V2
filter
head/cooler assembly
can be
in-
terchanged
with
earlier models. However, earlier
model
filter
head/coolers
can
not
be
used
on
1991V2
engines.
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