Dodge Dakota (R1). Manual — part 472
DESCRIPTION
N·m
In.
Ft.
Bolts (2wd)
Generator—Mounting
Bolt
41
—
30
Intake Manifold—Bolts
Refer to Procedure
Oil Pan—Bolts
24
215
—
Oil Pan—Drain Plug
34
—
25
Oil Pump—Mounting
Bolts
41
—
30
Oil Pump Cover—Bolts
11
95
—
Rear Insulator to
Bracket—
68
—
50
Through-Bolt (2WD)
Rear Insulator to
Crossmember
41
—
30
Support Bracket—Nut
(2WD)
Rear Insulator to
68
—
50
Crossmember—Nuts
(4WD)
Rear Insulator to
Transmission
68
—
50
— Bolts (4WD)
Rear Insulator Bracket—
Bolts
68
—
50
(4WD Automatic)
Rear Support Bracket to
41
—
30
Crossmember Flange—
Nuts
Rear Support Plate to
Transfer
41
—
30
Case—Bolts
Rocker Arm—Bolts
28
—
21
Spark Plugs
41
—
30
Starter Motor—Mounting
Bolts
68
—
50
Thermostat Housing—
Bolts
25
225
—
Throttle Body—Bolts
23
200
—
Torque Converter Drive
Plate—
31
270
—
Bolts
Transfer Case to
Insulator
204
—
150
Mounting Plate—Nuts
DESCRIPTION
N·m
In.
Ft.
Transmission Support
Bracket
68
—
50
—Bolts (2WD)
Vibration Damper—Bolt
183
—
135
Water Pump to Timing
Chain
41
—
30
Case Cover— Bolts
3.9L ENGINE
GENERAL DESCRIPTION
DESCRIPTION
SPECIFICATION
Engine Type
90° V-6 OHV
Bore and Stroke
99.3 x 84.0 mm
(3.91 x 3.31 in.)
Displacement
3.9L (238 c.i.)
Compression Ratio
9.1:1
Firing Order
1–6–5–4–3–2
Cylinder Compression
689.5 kPa
Pressure (Min.)
(100 psi)
CAMSHAFT
Bearing Diameter (Inside)
No. 1
50.800 - 50.825 mm
(2.000 - 2.001 in.)
No. 2
50.394 - 50.825 mm
(1.984 - 1.985 in.)
No. 3
49.606 - 49.632 mm
(1.953 - 1.954 in.)
No. 4
39.688 - 39.713 mm
(1.5265 - 1.5653 in.)
Journal Diameter
No. 1
50.749 - 50.775 mm
(1.998 - 1.999 in.)
No. 2
50.343 - 50.368 mm
(1.982 - 1.983 in.)
No. 3
49.555 - 49.581 mm
(1.951 - 1.952 in.)
No. 4
39.637 - 39.662 mm
(1.5605 - 1.5615 in.)
9 - 76
ENGINE 3.9L
AN
ENGINE 3.9L (Continued)
DESCRIPTION
SPECIFICATION
Bearing to Journal
Clearance
Standard
0.0254 - 0.0762 mm
(0.001 - 0.003 in.)
Max Allowable
0.127 mm
(0.005 in.)
End Play
0.051 - 0.254 mm
(0.002 - 0.010 in.)
CONNECTING RODS
Piston Pin Bore Diameter
24.940 - 24.978 mm
(0.9819 - 0.9834 in.)
Side Clearance
(Two Rods)
0.152 - 0.356 mm
(0.006 - 0.014 in.)
Total Weight
762 grams
(25.61 oz.)
CRANKSHAFT
Rod Journal Diameter
53.950 - 53.975 mm
(2.124 - 2.125 in.)
Rod Journal Out of
Round
(Max)
0.0254 mm
(0.001 in.)
Rod Journal Taper
(Max)
0.0254 mm
(0.001 in.)
Rod Journal Bearing
Clearance
0.013 - 0.056 mm
(0.0005 - 0.0022 in.)
Rod Journal Service Limit
0.08 mm
(0.003 in.)
Main Journal Diameter
63.487 - 63.513 mm
(2.4995 - 2.5005 in.)
Main Journal Out of
Round
(Max)
0.0254 mm
(0.001 in.)
DESCRIPTION
SPECIFICATION
Main Journal Taper
(Max)
0.0254 mm
(0.001 in.)
Main Journal Beraing
Clearance
No. 1
0.013 - 0.038 mm
(0.0005 - 0.0015 in.)
No. 2 - 4
0.013 - 0.051 mm
(0.0005 - 0.0020 in.)
Service Limit
0.064 mm
(0.0025 in.)
End Play
0.051 - 0.178 mm
(0.002 - 0.007 in.)
End Play Service Limit
0.254 mm
(0.010 in.)
CYLINDER BLOCK
Cylinder Bore Diameter
99.308 - 99.371 mm
(3.9098 - 3.9122 in.)
Cylinder Bore Out of
Round and
taper
(Max)
0.025 mm
(0.001 in.)
Lifter Bore Diameter
22.99 - 23.01 mm
(0.9501 - 0.9059 in.)
Distributor Drive Bushing
to
Bore Interference (Press
Fit)
0.0127 - 0.3556 mm
(0.0005 - 0.0140 in.)
Distributor Shaft to
Bushing
Clearance
0.0178 - 0.0686 mm
(0.0007 - 0.0027 in.)
CYLINDER HEAD and VALVES
Valve Seat Angle
44.25° - 44.75°
Valve Seat Runout
(Max)
0.0762 mm
(0.003 in.)
AN
ENGINE 3.9L
9 - 77
ENGINE 3.9L (Continued)
DESCRIPTION
SPECIFICATION
Valve Seat Width (Finish)
Intake
1.016 - 1.542 mm
(0.040 - 0.060 in.)
Exhaust
1.524 - 2.032 mm
(0.040 - 0.060 in.)
Valve Face Angle
43.25° - 43.75°
Valve Head Diameter
Intake
48.666 mm
(1.916 in.)
Exhaust
41.250 mm
(1.624 in.)
Valve Length (Overall)
Intake
124.28 - 125.92 mm
(4.893 - 4.918 in.)
Exhaust
124.64 - 125.27 mm
(4.907 - 4.932 in.)
Valve Lift (@ Zero Lash)
10.973 mm
(0.432 in.)
Valve Stem Diameter
7.899 - 7.925 mm
(0.311 - 0.312 in.)
Valve Guide Bore
Diameter
7.950 - 7.976 mm
(0.313 - 0.314 in.)
Valve Stem to Guide
Clearance
0.0254 - 0.0762 mm
(0.001 - 0.003 in.)
Valve Stem to Guide
Clearance
Service Limit (Rocking
Method)
0.4318 mm
(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.)
DESCRIPTION
SPECIFICATION
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 in Block
0.0279 - 0.0610 mm
(0.0011 - 0.210 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)
Bypass Valve Setting
62 - 103 kPa
(9 - 15 psi)
Switch Actuating
Pressure
34.5 - 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.)
9 - 78
ENGINE 3.9L
AN
ENGINE 3.9L (Continued)
DESCRIPTION
SPECIFICATION
Outer Rotor Clearance
(Max)
0.3556 mm
(0.014 in.)
Outer Rotor Diameter
(Min)
62.7126 mm
(2.469 in.)
Outer Rotor 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
0.0127 - 0.0381 mm
(0.0005 - 0.0015 in.)
Land Clearance
(Diameter)
0.635 - 1.016 mm
(0.025 - 0.040 in.)
Piston Length
86.360 mm
(3.40 in.)
Ring Groove Depth
#1 & 2
4.572 - 4.826 mm
(0.180 - 0.190 in.)
#3
3.810 - 4.064 mm
(0.150 - 0.160 in.)
Weight
592.6 - 596.6 grams
(20.90 - 21.04 oz.)
PISTON PINS
Clearance in Piston
0.0064 - 0.0191 mm
(0.00025 - 0.00075 in.)
Clearance in Rod
(Interference)
0.0178 - 0.0356 mm
(0.0007 - 0.0014 in.)
DESCRIPTION
SPECIFICATION
Diameter
24.996 - 25.001 mm
(0.9841 - 0.9843 in.)
End Play
None
Length
75.946 - 76.454 mm
(2.990 - 3.010 in.)
PISTON RINGS
Ring Gap
Compression Rings
0.254 - 0.508 mm
(0.010 - 0.020 in.)
Oil Control (Steel Rails)
0.254 - 1.270 mm
(0.010 - 0.050 in.)
Ring Side Clearance
Compression Rings
0.038 - 0.076 mm
(0.0015 - 0.0030 in.)
Oil Control (Steel Rails)
0.06 - 0.21 mm
(0.002 - 0.008 in.)
Ring Width
Compression Rings
1.971 - 1.989 mm
(0.0776 - 0.0783 in.)
Oil Control (Steel Rails)
3.848 - 3.975 mm
(0.1515 - 0.1565 in.)
VALVE TIMING
Exhaust Valve
Closes
16° (ATDC)
Opens
52° (BBDC)
Duration
248°
Intake Valve
Closes
50° (ABDC)
Opens
10° (BTDC)
Duration
240°
Valve Overlap
26°
AN
ENGINE 3.9L
9 - 79
ENGINE 3.9L (Continued)
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