2003 DODGE RAM length

DIODE
REMOVAL
(1) Disconnect the battery.
(2) Locate the diode in the harness, and remove
the protective covering.
(3) Remove the diode from the harness, pay atten-
tion to the current flow direction (Fig. 13).
INSTALLATION
(1) Remove the insulation from the wires in the
harness. Only remove enough insulation to solder in
the new diode.
(2) Install the new diode in the harness, making
sure current flow is correct. If necessary, refer to the
appropriate wiring diagram for current flow (Fig. 13).
(3) Solder the connection together using rosin core
type solder only.Do not use acid core solder.
(4) Tape the diode to the harness using electrical
tape. Make sure the diode is completely sealed from
the elements.
(5) Re-connect the battery and test affected sys-
tems.
TERMINAL
REMOVAL
(1) Follow steps for removing terminals described
in the connector removal section.
(2) Cut the wire 6 inches from the back of the con-
nector.
INSTALLATION
(1) Select a wire from the terminal repair kit that
best matches the color and gage of the wire being
repaired.
(2) Cut the repair wire to the proper length and
remove one±half (1/2) inch of insulation.
(3) Splice the repair wire to the wire harness (see
wire splicing procedure).
(4) Insert the repaired wire into the connector.
(5) Install the connector locking wedge, if required,
and reconnect the connector to its mating half/compo-
nent.
(6) Re-tape the wire harness starting at 1±1/2
inches behind the connector and 2 inches past the
repair.
(7) Connect battery and test all affected systems.
Fig. 13 DIODE IDENTIFICATION
1 - CURRENT FLOW
2 - BAND AROUND DIODE INDICATES CURRENT FLOW
3 - DIODE AS SHOWN IN THE DIAGRAMS
8W - 01 - 14 8W-01 WIRING DIAGRAM INFORMATIONDR

DESCRIPTION SPECIFICATION
Length (Overall)
Intake 113.45 - 114.21 mm
(4.4666 - 4.4965)
Exhaust 114.92 - 115.68 mm
(4.5244 - 4.5543 in.)
Stem Diameter
Intake 6.931 - 6.957 mm
(0.2729 - 0.2739 in.)
Exhaust 6.902 - 6.928 mm
(0.2717 - 0.2728 in.)
Stem - to - Guide
Clearance
Intake 0.018 - 0.069 mm
(0.0008 - 0.0028 in.)
Exhaust 0.047 - 0.098 mm
(0.0019 - 0.0039 in.)
Max. Allowable Stem -
to -
Guide Clearance
(Rocking
Method)
Intake 0.069 mm (0.0028 in.)
Exhaust 0.098 mm (0.0039 in.)
Valve Lift (Zero Lash)
Intake 12.00 mm (0.472 in.)
Exhaust 10.90 mm (0.4292 in.)
VALVE SPRING
Free Length (Approx)
Intake 48.92 mm (1.9260 in.)
Exhaust 49.81 mm (1.9610 in.)
Spring Force (Valve
Closed)
Intake 361.0 - 390.0 N @ 40.12
mm
(81.15 - 87.67 lbs. @
1.5795 in.)
Exhaust 390.0 - 430.0 N @ 40.12
mm
(87.67 - 96.66 lbs. @
1.5795 in.)DESCRIPTION SPECIFICATION
Spring Force (Valve
Open)
Intake 984.0 - 1040.0 N @
28.12 mm
221.2 - 233.8 lbs. @
1.107 in.)
Exhaust 965.0 - 1055.0 N @
28.12 mm
216.9 - 237.1 lbs. @
1.107 in.)
Number of Coils
Intake 7.30
Exhaust 7.45
Wire Diameter
Intake and Exhaust 4.77 ý 3.80mm
(0.1878 - 0.1496 in.)
Installed Height (Spring
Seat to Bottom of
Retainer)
Nominal
Intake 40.12 mm (1.579 in.)
Exhaust 40.12 mm (1.579 in.)
CYLINDER HEAD
Gasket Thickness
(Compressed) 0.7 mm (0.0276 in.)
Valve Seat Angle 44.5É - 45.0É
Valve Seat Runout (MAX) 0.051 mm (0.002 in.)
Valve Seat Width
Intake 1.75 - 2.36 mm
(0.0698 - 0.0928 in.)
Exhaust 1.71 - 2.32 mm
(0.0673 - 0.0911 in.)
Guide Bore Diameter
(Std.)6.975 - 7.00 mm
(0.2747 - 0.2756 in.)
Cylinder Head Warpage
(Flatness) 0.0508 mm (0.002 in.)
OIL PUMP
Clearance Over
Rotors/End Face (MAX)0.095 mm
(0.0038 in.)
9 - 14 ENGINE - 3.7LDR
ENGINE - 3.7L (Continued)

(5) The valve seat and valve face must maintain a
face angle of 44.5 ± 45 degrees angle (Fig. 17).
REMOVAL
NOTE: The cylinder heads must be removed in
order to perform this procedure.
(1) Remove rocker arms and lash adjusters(Refer
to 9 - ENGINE/CYLINDER HEAD/ROCKER ARM /
ADJUSTER ASSY - REMOVAL). (Fig. 18).
(2) Remove the camshaft bearing caps and the
camshaft.
NOTE: All six valve springs and valves are removed
in the same manner; this procedure only covers
one valve and valve spring.
(3) Using Special Tool C-3422±B or C-3422±C
Valve Spring Compressor and Special tool 8519
Adapter, compress the valve spring.
NOTE: It may be necessary to tap the top of the
valve spring to loosen the spring retainers locks
enough to be removed.
(4) Remove the two spring retainer lock halves.
NOTE: the valve spring is under tension use care
when releasing the valve spring compressor.(5) Remove the valve spring compressor.
(6) Remove the spring retainer, and the spring.
NOTE: Check for sharp edges on the keeper
grooves. Remove any burrs from the valve stem
before removing the valve from the cylinder head.
(7) Remove the valve from the cylinder head.
NOTE: The valve stem seals are common between
intake and exhaust.
(8) Remove the valve stem seal. Mark the valve for
proper installation.
TESTING VALVE SPRINGS
NOTE: Whenever the valves are removed from the
cylinder head it is recommended that the valve
springs be inspected and tested for reuse.
Inspect the valve springs for physical signs of wear
or damage. Turn table of tool C-647 until surface is
in line with the 40.12 mm (1.579 in.) mark on the
threaded stud and the zero mark on the front. Place
spring over the stud on the table and lift compress-
ing lever to set tone device. Pull on torque wrench
until Ping is heard. Take reading on torque wrench
at this instant. Multiply this reading by two. This
will give the spring load at test length. Fractional
measurements are indicated on the table for finer
Fig. 17 Valve Assembly Configuration
1 - VALVE LOCKS (3±BEAD)
2 - RETAINER
3 - VALVE STEM OIL SEAL
4 - INTAKE VALVE
5 - EXHAUST VALVE
6 - VALVE SPRING
Fig. 18 Rocker Arm Removal
1 - CAMSHAFT
2 - SPECIAL TOOL 8516
9 - 28 ENGINE - 3.7LDR
INTAKE/EXHAUST VALVES & SEATS (Continued)

DESCRIPTION SPECIFICATION
Taper (MAX) 0.008 mm (0.0004 in.)
End Play 0.052 - 0.282 mm
(0.0021 - 0.0112 in.)
End Play (MAX) 0.282 mm (0.0112 in)
Connecting Rod
Journal
Diameter 50.992 - 51.008 mm
(2.0076 - 2.0082 in.)
Bearing Clearance 0.015 - 0.055 mm
(0.0006 -0.0022 in.)
Out of Round (MAX) 0.005 mm (0.0002 in.)
Taper (MAX) 0.008 mm (0.0004 in.)
CAMSHAFT
Bore Diameter 26.02 - 26.04 mm
(1.0245 - 1.0252 in.)
Bearing Journal Diameter 25.975 - 25.995 mm
(1.0227 - 1.0235 in.)
Bearing Clearance 0.025 - 0.065 mm
(0.001 - 0.0026 in.)
Bearing Clearance (MAX) 0.065 mm (0.0026 in.)
End Play .075 - .200 mm
(0.003 - 0.0079 in.)
End Play (MAX) .200 mm (0.0079 in.)
VALVE TIMING
Intake
Opens (BTDC) 4.4É
Closes (ATDC) 239.1É
Duration 243.5É
Exhaust
Opens (BTDC) 240.5É
Closes (ATDC) 13.2É
Duration 253.70É
Valve Overlap 17.6É
VA LV E S
Face Angle 45É - 45.5É
Head Diameter
Intake 48.52 - 48.78 mm
(1.9103 - 1.9205 in.)
Exhaust 36.87 - 37.13 mm
1.4516 - 1.4618 in.)DESCRIPTION SPECIFICATION
Length (Overall)
Intake 113.45 - 114.21 mm
(4.4666 - 4.4965)
Exhaust 114.92 - 115.68 mm
(4.5244 - 4.5543 in.)
Stem Diameter
Intake 6.931 - 6.957 mm
(0.2729 - 0.2739 in.)
Exhaust 6.902 - 6.928 mm
(0.2717 - 0.2728 in.)
Stem - to - Guide
Clearance
Intake .018 - .069 mm
(0.0008 - 0.0028 in.)
Exhaust .047 - .098 mm
(0.0019 - 0.0039 in.)
Max. Allowable Stem -
to -
Guide Clearance
(Rocking
Method)
Intake 0.069 mm (0.0028 in.)
Exhaust 0.098 mm (0.0039 in.)
Valve Lift (Zero Lash)
Intake 11.25 mm (0.443 in.)
Exhaust 10.90 mm (0.4292 in.)
VALVE SPRING
Free Length (Approx)
Intake and Exhaust 49.0 mm (1.9291 in.)
Spring Force (Valve
Closed)
Intake and Exhaust 313.0 - 354.0 N @ 40.12
mm
(70.3652 - 79.58237 lbs.
@ 1.5795 in.)
Spring Force (Valve
Open)
Intake and Exhaust 776.0 - 870.0 N @ 28.88
mm
174.4517 - 195.5838 lbs.
@ 1.1370 in.)
DRENGINE - 4.7L 9 - 99
ENGINE - 4.7L (Continued)

NOTE: It may be necessary to tap the top of the
valve spring to loosen the spring retainers locks
enough to be removed.
(4) Remove the two spring retainer lock halves.
NOTE: the valve spring is under tension use care
when releasing the valve spring compressor.
(5) Remove the valve spring compressor.
(6) Remove the spring retainer, and the spring.
NOTE: Check for sharp edges on the keeper
grooves. Remove any burrs from the valve stem
before removing the valve from the cylinder head.
(7) Remove the valve from the cylinder head.
NOTE: The valve stem seals are common between
intake and exhaust.
(8) Remove the valve stem seal. Mark the valve for
proper installation.
TESTING VALVE SPRINGS
NOTE: Whenever the valves are removed from the
cylinder head it is recommended that the valve
springs be inspected and tested for reuse.
Inspect the valve springs for physical signs of wear
or damage. Turn table of tool C-647 until surface is
in line with the 40.12 mm (1.579 in.) mark on the
threaded stud and the zero mark on the front. Place
spring over the stud on the table and lift compress-
ing lever to set tone device. Pull on torque wrench
until Ping is heard. Take reading on torque wrench
at this instant. Multiply this reading by two. This
will give the spring load at test length. Fractional
measurements are indicated on the table for finer
adjustments. Refer to Specifications Section to obtain
specified height and allowable tensions. Replace any
springs that do not meet specifications (Fig. 42).
INSTALLATION
(1) coat the valve stem with clean engine oil and
insert it into the cylinder head.
(2) Install the valve stem seal. make sure the seal
is fully seated and that the garter spring at the top
of the seal is intact.
(3) Install the spring and the spring retainer (Fig.
43).
(4) Using the valve spring compressor, compress
the spring and install the two valve spring retainer
halves.
(5) Release the valve spring compressor and make
sure the two spring retainer halves and the spring
retainer are fully seated.(6) lubricate the camshaft journal with clean
engine oil then Position the camshaft (with the
sprocket dowel on the left camshaft at 11 o'clock and
the right camshaft at 12 o'clock), then position the
camshaft bearing caps.
Fig. 42 Testing Valve Springs
1 - SPECIAL TOOL C-647
Fig. 43 Valve Assembly Configuration
1 - VALVE LOCKS (3±BEAD)
2 - RETAINER
3 - VALVE STEM OIL SEAL
4 - INTAKE VALVE
5 - EXHAUST VALVE
6 - VALVE SPRING
DRENGINE - 4.7L 9 - 123
INTAKE/EXHAUST VALVES & SEATS (Continued)

DESCRIPTION SPECIFICATION
CYLINDER BLOCK
Cylinder Bore
Diameter 99.50 ± mm
(3.917 ± in.)
Out of Round (Max.) 0.00762 ± mm
.0003 ( in.)
Taper (Max.) 0.0127 ± mm
0005 ( in.)
Lifter Bore
Diameter 21.45 ± 21.425 mm
(0.8444 ± 0.8435 in.)
CYLINDER HEAD AND VALVES
Valve Seat
Angle 44.50É ± 45.00É
Runout (Max.) 0.05 mm (0.0019 in.)
Width (Finish)
Intake 1.018 ± 1.62 mm
(0.0464 ± 0.0637 in.)
Exhaust 1.48 ± 1.92 mm
(0.0582 ± 0.0755 in.)
Valves
Face Angle 45.0É ± 45.5É
Head Diameter
Intake 50.67 mm ± 50.93 mm
(1.99 in.) ± (2.00 in.)
Exhaust 39.27mm ± 39.53mm
(1.54 in.) ± (1.55 in.)
Length (Overall)
Intake 123.38 ± 123.76 mm
(4.857 in. ± 4.872 in.)
Exhaust 120.475 ± 120.855 mm
(4.743 in. ± 4.758 in.)
Valve Lift (@ zero lash)
Intake 12 mm (0.472 in.)
Exhaust 11.7 mm (0.460 in.)
Stem Diameter
Intake 7.935 - 7.953 mm
(0.312 - 0.313 in.)DESCRIPTION SPECIFICATION
Exhaust 7.905 - 7.925 mm
(0.311 - 0.312 in.)
Guide Bore 7.975 - 8.000 mm
(0.313 - 0.314 on.)
Stem to Guide Clearance
Intake 0.022 - 0.065 mm
(0.0008 - 0.0025 in.)
Exhaust 0.050 - 0.095 mm
(0.0019 - 0.0037 in.)
Valve Springs
Spring Tension
Valve closed 422 N @ 46.0 mm
(95 lbs. @ 1.81 in.)
Valve open @ 33.5 mm
Number of Coils 7.4
Installed Height 46.0 mm (1.81 in.)
Wire Diameter 5.39 x 4.52mm
(0.212 ± 0.177in.)
HYDRAULIC TAPPETS
Body Diameter 21.387 - 21.405 mm
(0.8420 - 0.8427 in.)
Clearance (to bore) 0.020 - 0.063 mm
(0.0007 - 0.0024 in.)
Dry Lash 3.0 mm (at the valve)
(0.1181 in.)
OIL PRESSURE
Curb Idle (Min.*) 25 kPa ( 4 psi)
@ 3000 rpm 170-758 kPa ( 25-110
psi)
* If oil pressure is zero at curb idle, DO NOT RUN
ENGINE.
OIL PUMP
Clearance over Rotors
(Max.).095 mm ( 0.0038 in.)
Outer Rotor to pump
body
DRENGINE - 5.7L 9 - 189
ENGINE - 5.7L (Continued)

DESCRIPTION SPECIFICATION
Clearance (Max.) 0.235 mm ( 0.009 in.)
Tip Clearance between
Rotors (Max.) .150 mm (0.006 in.)
PISTONS
Clearance at Top of Skirt
measured at 45.0 mm
(1.77 in.) below deck0.0215 - 0.0485 mm
(0.0008 - 0.0019 in.)
Land Clearance (Diam.)
Groove #1 0.6715 - 0.7105 mm
(0.0264 - 0.0279 in.)
Groove #2 .5455 - .6245
(0.0214 - 0.0245 in.)
Piston Length 54.70 ± 55.30mm
(2.153 ± 2.177 in.)
Piston Ring Groove
Width
Groove #1 1.51 - 1.54 mm
(0.0594 - 0.0606 in.)
Groove #2 1.51 - 1.53 mm
(0.0594 - 0.0602 in.)
Groove #3 3.030 - 3.055 mm
(0.1192 - 0.1202 in.)
Weight 413 grams
(14.56 oz.)
PISTON PINS
Clearance in Piston 0.009 - 0.018 mm
(0.00035 - 0.00070 in.)
Diameter 24.0 - 24.003 mm
(0.9448 - 0.9449 in.)
Length 69.75 - 70.25 mm
(2.74 - 2.76 in.)
PISTON RINGS
Ring Gap
Compression Ring (Top) 0.23 - 0.38 mm
(0.0090 - 0.0149 in.)DESCRIPTION SPECIFICATION
Compression Ring (2nd) 0.35 - 0.60 mm
(0.0137 - 0.0236 in.)
Oil Control (Steel Rails) 0.15 - 0.66 mm
(0.0059 - 0.0259 in.)
Ring Side Clearance
Compression Rings
Top 0.02 - 0.068 mm
(0.0007 - 0.0026 in.)
2nd 0.02 - 0.058 mm
(0.0007 - 0.0022 in.)
Ring Width
Compression rings 1.472 - 1.490 mm
(0.05795 - 0.0586 in.)
Oil Ring (Steel Rails) &
Max.0.447 - 0.473 mm
(0.0175 - 0.0186 in.)
VALVE TIMING
Exhaust Valve
Closes (ATDC) 27É
Opens (BTDC) 233É
Intake Valve
Closes (ATDC) 253É
Opens (BTDC) 7É
Valve Overlap 34É
9 - 190 ENGINE - 5.7LDR
ENGINE - 5.7L (Continued)

DESCRIPTION SPECIFICATION
Intake 47.752 mm (1.88 in.)
Exhaust 41.072 (1.617 in.)
Length (Overall)
Intake 126.21 ± 126.85 mm
(4.969 ± 4.994 in.)
Exhaust 126.44 ± 127.30 mm
(4.978 ± 5.012 in.)
Lift (@ zero lash)
Intake 10.414 mm (0.410 in.)
Exhaust 10.592 mm (0.417 in.)
Stem Diameter
Intake 9.449 - 9.474 mm
(0.372 - 0.373 in.)
Exhaust 9.423 - 9.449 mm
(0.371 - 0.372 in.)
Guide Bore 9.500 - 9.525 mm
(0.374 - 0.375 on.)
Stem to Guide Clearance
Intake 0.0254 - 0.0762 mm
(0.001 - 0.003 in.)
Exhaust 0.0508 - 0.1016 mm
(0.002 - 0.004 in.)
Service Limit 0.4318 - (0.017 in.)
Valve Springs
Free Length 49.962 mm (1.967 in.)
Spring Tension
Valve closed 378 N @ 41.66 mm
(85 lbs. @ 1.64 in.)
Valve open 890 N @ 30.89 mm
(200 lbs. @ 1.212 in.)
Number of Coils 6.8
Installed Height 41.66 mm (1.64 in.)
Wire Diameter 4.50 mm (0.177 in.)
HYDRAULIC TAPPETS
Body Diameter 22.949 - 22.962 mm
(0.9035 - 0.9040 in.)
Clearance (to bore) 0.0279 - 0.0610 mmDESCRIPTION SPECIFICATION
(0.0011 - 0.0024 in.)
Dry Lash 1.524 - 5.334 mm
(0.060 - 0.210 in.)
Push Rod Length 175.64 - 176.15 mm
(6.915 - 6.935 in.)
OIL PRESSURE
Curb Idle (Min.*) 41.4 kPa (6 psi)
@ 3000 rpm 207 - 552 kPa (30 - 80
psi)
Oil Pressure Bypass
Valve Setting 62 - 103 kPa (9 - 15 psi)
Switch Actuating
Pressure34.5 - 48.3 kPa (5 - 7
psi)
* If oil pressure is zero at curb idle, DO NOT RUN
ENGINE.
OIL PUMP
Clearance over Rotors
(Max.)0.1016 mm (0.004 in.)
Cover Out of Flat (Max.) 0.0381 mm (0.0015 in.)
Inner Rotor Thickness
(Min.)20.955 mm (0.825 in.)
Outer Rotor
Clearance (Max.) 0.3556 mm (0.014 in.)
Diameter (Min.) 62.7126 mm (2.469 in.)
Thickness (Min.) 20.955 mm (0.825 in.)
Tip Clearance between
Rotors (Max.) 0.2032 mm (0.008 in.)
PISTONS
Clearance at Top of Skirt 0.013 - 0.038 mm
(0.0005 - 0.0015 in.)
Land Clearance (Diam.) 0.508 - 0.660 mm
(0.020 - 0.026 in.)
Piston Length 81.03 mm (3.19 in.)
Piston Ring Groove
Depth
Groove #1 and 2 4.761 - 4.912 mm
DRENGINE - 5.9L 9 - 237
ENGINE - 5.9L (Continued)