Dodge Durango (DN). Manual — part 442
ring gap should be between 0.508-0.762 mm (0.020-
0.030 inch). The oil ring gap should be 0.254-1.270
mm (0.010-0.050 inch).
(c) Rings with insufficient end gap may be prop-
erly filed to the correct dimension. Rings with
excess gaps should not be used.
(2) Install rings and confirm ring side clearance:
(a) Install oil rings being careful not to nick or
scratch the piston. Install the oil control rings
according to instructions in the package. It is not
necessary to use a tool to install the upper and
lower rails. Insert oil rail spacer first, then side
rails.
(b) Install the second compression rings using
Installation Tool C-4184. The compression rings
must be installed with the identification mark face
up (toward top of piston) and chamfer facing down.
An identification mark on the ring is a drill point,
a stamped letter “O”, an oval depression or the
word TOP (Fig. 26) (Fig. 28).
(c) Using a ring installer, install the top com-
pression ring with the chamfer facing up (Fig. 27)
(Fig. 28). An identification mark on the ring is a
drill point, a stamped letter “O”, an oval depression
or the word TOP facing up.
(d) Measure side clearance between piston ring
and ring land. Clearance should be 0.074-0.097 mm
(0.0029-0.0038 inch) for the compression rings. The
steel rail oil ring should be free in groove, but
should not exceed 0.246 mm (0.0097 inch) side
clearance.
(e) Pistons with insufficient or excessive side
clearance should be replaced.
PISTON MEASUREMENT CHART
PISTON
A DIA = PISTON
BORE
SIZE
DIAMETER
DIAMETER
MIN.
MAX.
MIN.
MAX.
mm
(in.)
mm
(in.)
mm
(in.)
mm (in.)
A
—
—
—
—
B
101.580
101.592
101.605
101.618
(3.9992)
(3.9997)
(4.0002)
(4.0007)
C
101.592
101.605
101.618
101.630
(3.9997)
(4.0002)
(4.0007)
(4.0012)
D
101.605
101.618
101.630
101.643
(4.0002)
(4.0007)
(4.0012)
(4.0017)
E
—
—
—
—
DESCRIPTION
SPECIFICATION
PISTON PIN BORE
25.007 - 25.015 mm
(.9845 -.9848 in.)
RING GROOVE
HEIGHT
OIL RAIL
4.033 - 4.058 mm
(.1588 -.1598 in.)
COMPRESSION
RAIL
1.529 - 1.554 mm
(.0602 -.0612 in.)
TOTAL FINISHED
470.8
6
2 grams
WEIGHT
(16.607
6
.0706 ounces)
Fig. 26 Second Compression Ring Identification
(Typical)
1 – SECOND COMPRESSION RING (BLACK CAST IRON)
2 – CHAMFER
3 – TWO DOTS
Fig. 27 Top Compression Ring Identification
(Typical)
1 – TOP COMPRESSION RING (GRAY IN COLOR)
2 – CHAMFER
3 – ONE DOT
DN
5.2L ENGINE
9 - 99
SERVICE PROCEDURES (Continued)
CONNECTING ROD BEARINGS—FITTING
Fit all rods on a bank until completed. DO NOT
alternate from one bank to another, because connect-
ing rods and pistons are not interchangeable from
one bank to another.
The bearing caps are not interchangeable and
should be marked at removal to ensure correct
assembly.
Each bearing cap has a small V-groove across the
parting face. When installing the lower bearing shell,
make certain that the V-groove in the shell is in line
with the V-groove in the cap. This provides lubrica-
tion of the cylinder wall in the opposite bank.
The bearing shells must be installed so that the
tangs are in the machined grooves in the rods and
caps.
Limits of taper or out-of-round on any crankshaft
journals should be held to 0.025 mm (0.001 inch).
Bearings are available in 0.025 mm (0.001 inch),
0.051 mm (0.002 inch), 0.076 mm (0.003 inch), 0.254
mm (0.010 inch) and 0.305 mm (0.012 inch) under-
size. Install the bearings in pairs. DO NOT use a
new bearing half with an old bearing half. DO
NOT file the rods or bearing caps.
CRANKSHAFT MAIN BEARINGS—FITTING
Bearing caps are not interchangeable and should
be marked at removal to ensure correct assembly.
Upper and lower bearing halves are NOT inter-
changeable. Lower main bearing halves of No.2 and 4
are interchangeable.
Upper and lower No.3 bearing halves are flanged
to carry the crankshaft thrust loads. They are NOT
interchangeable with any other bearing halves in the
engine (Fig. 30). Bearing shells are available in stan-
dard and the following undersizes: 0.25 mm (0.001
inch), 0.051 mm (0.002 inch), 0.076 mm (0.003 inch),
0.254 mm (0.010 inch) and 0.305 mm (0.012 inch).
Never install an undersize bearing that will reduce
clearance below specifications.
REMOVAL AND INSTALLATION
ENGINE MOUNTS—FRONT
REMOVAL
On 4WD vehicles the engine front support brackets
attach directly to engine block and the axle housing.
The brackets provide a solid interconnection for these
units (Fig. 31) (Fig. 32). Engine must be supported
during any service procedures involving the front
support assemblies.
Fig. 28 Compression Ring Chamfer Location
(Typical)
1 – CHAMFER
2 – TOP COMPRESSION RING
3 – SECOND COMPRESSION RING
4 – PISTON
5 – CHAMFER
Fig. 29 Proper Ring Installation
1 – OIL RING SPACER GAP
2 – SECOND COMPRESSION RING GAP OIL RING RAIL GAP
(TOP)
3 – OIL RING RAIL GAP (BOTTOM)
4 – TOP COMPRESSION RING GAP
Fig. 30 Main Bearing Identification
9 - 100
5.2L ENGINE
DN
SERVICE PROCEDURES (Continued)
(1) Disconnect the negative cable from the battery.
(2) Raise vehicle on hoist.
(3) Install engine lifting (support) fixture.
(4) Remove front axle assembly. (Refer to Group 3,
Differential and Driveline in this publication.)
(5)
Left mount insulator only. Remove starter
wires and starter motor assembly.
(6) Remove insulator to frame through bolt (Fig.
33).
(7) Raise engine slightly.
(8) Remove upper insulator to support bracket
stud nut and insulator to support through bolt.
(9) Remove engine mount insulator (Fig. 31) (Fig.
32).
(10) If engine support bracket is to be removed/re-
placed, remove support bracket to transmission bell
housing bolt(s) and three (3) support bracket to
engine block bolts. Remove support bracket (Fig. 31)
(Fig. 32).
INSTALLATION—4WD
(1) If engine support brackets were removed,
install them and their fasteners (Fig. 31) (Fig. 32).
Tighten support bracket to block bolts to 41 N·m (30
ft. lbs.). Tighten support bracket to transmission bell-
housing bolt(s) to 88 N·m (65 ft. lbs.).
(2) Install Engine mount insulator and tighten
insulator to support bracket nut to 41 N·m (30 ft.
lbs.). Tighten insulator to support bracket through
bolt nut to 102 N·m (75 ft. lbs.).
(3) Lower engine and install insulator to frame
through bolt and nut (Fig. 33). Tighten nut to 95 N·m
(70 ft. lbs.).
(4) Install
starter
motor
and
mounting
bolts.
Tighten bolts to 68 N·m (50 ft. lbs.).
(5) Connect starter wires.
(6) Remove engine lifting (support) fixture.
(7) Install front axle assembly. (Refer to Group 3,
Differential and Driveline).
(8) Lower the vehicle.
(9) Connect the negative cable to the battery.
Fig. 31 Right Engine Mount Insulator and Support
Bracket
1 – ENGINE SUPPORT BRACKET
2 – INSULATOR
3 – FRONT AXLE
Fig. 32 Left Engine Mount Insulator and Support
Bracket
1 – ENGINE SUPPORT BRACKET
2 – INSULATOR
3 – FRONT AXLE
DN
5.2L ENGINE
9 - 101
REMOVAL AND INSTALLATION (Continued)
ENGINE MOUNT—REAR
REMOVAL
(1) Disconnect the negative cable from the battery.
(2) Raise the vehicle on a hoist.
(3) Support the transmission with a transmission
jack.
(4) Remove stud nuts holding the insulator to the
crossmember (Fig. 34).
(5) Raise rear of transmission SLIGHTLY.
(6) Remove bolts holding the insulator to the insu-
lator bracket (Fig. 34). Remove the insulator.
INSTALLATION
(1) If the insulator bracket was removed, install
the bracket to the transmission (Fig. 34). Tighten the
bolts to 28 N·m (250 in. lbs.) torque.
(2) Install the bolts holding insulator to insulator
bracket. Tighten the bolts to 28 N·m (250 in. lbs.)
torque.
(3) Lower rear of transmission while aligning the
insulator studs into the mounting support bracket.
Install stud nuts and tighten to 28 N·m (250 in. lbs.)
torque.
(4) Remove the transmission jack.
(5) Lower the vehicle.
(6) Connect the negative cable to the battery.
ENGINE ASSEMBLY
REMOVAL
(1) Scribe hood hinge outlines on hood. Remove the
hood.
(2) Disconnect the battery negative cable.
(3) Drain cooling system (refer to Group 7, Cooling
System for the proper procedure).
(4) Remove the air cleaner.
(5) Disconnect the radiator and heater hoses.
Remove radiator (refer to Group 7, Cooling System
for the correct procedures).
(6) Set fan shroud aside.
(7) Disconnect the vacuum supply lines from the
intake manifold.
(8) Remove the distributor cap and wires.
Fig. 33 Engine Mount Insulator at Frame
1 – NUT
2 – ENGINE SUPPORT BRACKET
3 – INSULATOR
4 – NUT
5 – THROUGH BOLT
6 – FRAME
7 – FRONT AXLE
Fig. 34 Rear Mount Insulator
1 – AUTOMATIC TRANSMISSION
2 – INSULATOR BRACKET
3 – INSULATOR
4 – CROSSMEMBER
9 - 102
5.2L ENGINE
DN
REMOVAL AND INSTALLATION (Continued)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст