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Service Information - 3.7L Engine: Specifications Dodge Dakota III

Mechanical 33 illustrations ~267 words

SPECIFICATIONS - 3.7L ENGINE

DESCRIPTIONSPECIFICATION
Type90° SOHC V6 12 Valve
Number of Cylinders6
Firing Order1-6-5-4-3-2
Lead CylinderNo. 1 Left Bank
Compression Ratio9.6:1
Max. Variation Between Cylinders25%
MetricStandard
Displacement3.7 Liters226 Cubic Inches
Bore93.0 mm3.66 in.
Stroke90.8 mm3.40 in.
Horsepower211 @ 5200 RPM
Torque236 ft. lbs. @ 4000 RPM
Compression Pressure1172-1551 kPa170-225 psi

GENERAL SPECIFICATIONS

DESCRIPTIONSPECIFICATION
MetricStandard
Bore Diameter93.013 +/-.0075 mm3.6619 +/- 0.0003 in.
Out of Round (MAX)0.076 mm0.003 in.
Taper (MAX)0.051 mm0.002 in.

CYLINDER BLOCK

DESCRIPTIONSPECIFICATION
MetricStandard
Diameter92.975 mm3.6605 in.
Weight365.0 grams12.87 oz.
Ring Groove Diameter
No. 185.37 - 83.13 mm3.282 - 3.273 in
No. 282.833 - 83.033 mm3.261 - 3.310 in.
No. 383.88 - 84.08 mm3.302 - 3.310 in.

PISTONS

DESCRIPTIONSPECIFICATION
MetricStandard
Clearance In Piston0.006 - 0.015 mm0.0002 - 0.0005 in.
Diameter24.017 - 24.020 mm0.9455 - 0.9456 in.

PISTON PINS

DESCRIPTIONSPECIFICATION
MetricStandard
Ring Gap
Top Compression Ring0.20 - 0.36 mm0.0079 - 0.0142 in.
Second Compression Ring0.37 - 0.63 mm0.0146 - 0.0249 in.
Oil Control (Steel Rails)0.25 - 0.76 mm0.0099 - 0.30 in.
Side Clearance
Top Compression Ring.051 -.094 mm0.0020 - 0.0037 in.
Second Compression Ring0.040 - 0.080 mm0.0016 - 0.0031 in.
Oil Ring (Steel Ring).019 -.229 mm.0007 -.0091 in.
Ring Width
Top Compression Ring1.472 - 1.490 mm0.057 - 0.058 in.
Second Compression Ring1.472 - 1.490 mm0.057 - 0.058 in.
Oil Ring (Steel Rails)0.445 - 0.470 mm0.017 - 0.018 in.

PISTON RINGS

DESCRIPTIONSPECIFICATION
MetricStandard
Bearing Clearance0.006 - 0.044 mm0.0002 - 0.0017 in.
Side Clearance0.10 - 0.35 mm0.004 - 0.0138 in.
Piston Pin Clearance.015 -.028 mm0.0006 - 0.0011 in.
Bearing Bore Out of Round (MAX)0.004 mm0.0002 in.
Total Weight (Less Bearing)612 grams21.588 ounces

CONNECTING RODS

DESCRIPTIONSPECIFICATION
MetricStandard
Main Bearing Journal Diameter63.488 - 63.512 mm2.4996 - 2.5005 in.
Bearing Clearance0.002 - 0.046 mm0.00008 - 0.0018 in.
Out of Round (MAX)0.005 mm0.0002 in.
Taper (MAX)0.006 mm0.0004 in.
End Play0.052 - 0.282 mm0.0021 - 0.0112 in.
End Play (MAX)0.282 mm0.0112 in.
Connecting Rod Journal Diameter57.908 - 57.892 mm2.2798 - 2.2792 in.
Bearing Clearance0.006 - 0.0440.0002 - 0.0011 in.
Out of Round (MAX)0.005 mm0.0002 in.
Taper (MAX)0.006 mm0.0002 in.

CRANKSHAFT

DESCRIPTIONSPECIFICATION
MetricStandard
Bore Diameter26.02 - 26.04 mm1.0245 - 1.0252 in.
Bearing Journal Diameter25.975 - 25.995 mm1.0227 - 1.0235 in.
Bearing Clearance0.025 - 0.065 mm0.001 - 0.0026 in.
Bearing Clearance (MAX)0.065 mm0.0026 in.
End Play.075 -.200 mm0.003 - 0.0079 in.
End Play (MAX).200 mm0.0079 in.

CAMSHAFT

DESCRIPTIONSPECIFICATION
Intake
Opens (BTDC)5.6°
Closes (ATDC)240.1°
Duration245.7°
Exhaust
Opens (BTDC)241.5°
Closes (ATDC)20.1°
Duration261.6°
Valve Overlap25.7°

VALVE TIMING

DESCRIPTIONSPECIFICATION
MetricStandard
Face Angle45° - 45.5°
Head Diameter
Intake48.52 - 48.78 mm1.9103 - 1.9205 in.
Exhaust36.87 - 37.13 mm1.4516 - 1.4618 in.
Length (Overall)
Intake113.45 - 114.21 mm4.4666 - 4.4965 in.
Exhaust114.92 - 115.68 mm4.5244 - 4.5543 in.
Stem Diameter
Intake6.931 - 6.957 mm0.2729 - 0.2739 in.
Exhaust6.902 - 6.928 mm0.2717 - 0.2728 in.
Stem-to-Guide Clearance
Intake0.018 - 0.069 mm0.0008 - 0.0028 in.
Exhaust0.047 - 0.098 mm0.0019 - 0.0039 in.
Max. Allowable Stem-to-Guide Clearance (Rocking Method)
Intake0.069 mm0.0028 in.
Exhaust0.098 mm0.0039 in.
Valve Lift (Zero Lash)
Intake12.00 mm0.472 in.
Exhaust12.00 mm0.472 in.

VALVES

DESCRIPTIONSPECIFICATION
MetricStandard
Free Length (Approx.)
Intake48.18 mm1.896 in.
Exhaust - w/damper48.2 mm1.897 in.
Spring Force (Valve Closed)
Intake332.0 - 368.0 N @ 40.12 mm74.63 - 82.72 lbs. @ 1.5795 in.
Exhaust - (without damper)356 - 394 N @ 39.12 mm80.031 - 88.57 lbs. @ 1.54 in.
Spring Force (Valve Open)
Intake948.0 - 1038.0 N @ 28.12 mm213.2 - 233.8 lbs. @ 1.107 in.
Exhaust - without damper974 - 956 N @ 27.12 mm218.8 - 215.1 lbs. @ 1.067 in.
Number of Coils
Intake7.30
Exhaust7.15
Wire Diameter
Intake4.77 x 3.80 mm0.1878 x 0.1496 in.
Exhaust4.66 x 3.72 mm0.1843 x.1464 in.
Installed Height (Spring Seat to Bottom of Retainer)
Nominal
Intake40.12 mm1.579 in.
Exhaust - w/damper40.12 mm1.579 in.

VALVE SPRING

DESCRIPTIONSPECIFICATION
MetricStandard
Gasket Thickness (Compressed)0.7 mm(0.0276 in.)
Valve Seat Angle44.5° - 45.0°
Valve Seat Runout (MAX)0.051 mm0.002 in.
Valve Seat Width
Intake1.75 - 2.36 mm0.0698 - 0.0928 in.
Exhaust1.71 - 2.32 mm0.0673 - 0.0911 in.
Guide Bore Diameter (Std.)6.975 - 7.00 mm0.2747 - 0.2756 in.
Cylinder Head Warpage (Flatness)0.0508 mm0.002 in.

CYLINDER HEAD

DESCRIPTIONSPECIFICATION
MetricStandard
Clearance Over Rotors/End Face (MAX)0.095 mm0.0038 in.
Cover Out - of - Flat (MAX)0.025 mm0.001 in.
Inner and Outer Rotor Thickness12.02 mm0.4731 in.
Outer Rotor to pocket (Diameter) clearance (MAX).235 mm.0093 in.
Outer Rotor Diameter (MIN)85.925 mm0.400 in.
Tip Clearance Between Rotors (MAX)0.150 mm0.006 in.

OIL PUMP

SPECIFICATIONSPECIFICATION
MetricStandard
At Curb Idle Speed (MIN)*25 kPa4 psi
@ 3000 RPM170 - 758 kPa25 - 110 psi
* CAUTION: If pressure is zero at curb idle, DO NOT run engine at 3000 RPM.

OIL PRESSURE

TORQUE

DESCRIPTIONN.mFt. Lbs.In. Lbs.
Camshaft
Non - Oiled Sprocket Bolt12290
Bearing Cap Bolts11100
Counterbalance Shaft Retaining Bolt28250
Timing Chain Cover Bolts5843
Connecting Rod Cap Bolts2720
PLUS 90° TURN
Bed Plate BoltsRefer to Procedure
Crankshaft Damper Bolt175130
Cylinder Head Bolts
M11 BoltsRefer To INSTALLATION
M8 BoltsRefer To INSTALLATION
Cylinder Head Cover Bolts12105
Exhaust Manifold Bolts2518
Exhaust Manifold Heat Shield Nuts872
Then loosen 45°
Flexplate Bolts9570
Engine Mount Bracket to Block Bolts6145
Rear Mount to Transmission Bolts4634
Generator Mounting Bolts
M10 Bolts5440
M8 Bolts28250
Intake Manifold Bolts12105
Refer to INSTALLATION procedure for Tightening Sequence
Oil Pan Bolts15130
Oil Pan Drain Plug3425
Oil Pump Bolts28250
Oil Pump Cover Bolts12105
Oil Pickup Tube Bolt and Nut28250
Oil Dipstick Tube to Engine Block Bolt15130
Oil Fill Tube Bolts12105
Timing Chain Guide Bolts28250
Timing Chain Tensioner Arm28250
Hydraulic Tensioner Bolts28250
Timing Chain Primary Tensioner Bolts28250
Timing Drive Idler Sprocket Bolt3425
Thermostat Housing Bolts12105
Water Pump Bolts5843

Scheme 1

Scheme 1: 3.7L ENGINE
Scheme 1: 3.7L ENGINE

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Scheme 31

Scheme 31: Filter Element Only
Scheme 31: Filter Element Only

Housing removal is not necessary for element (filter) replacement.

  1. Loosen clamp (1) and disconnect air duct at air cleaner cover (3).
  2. Pry over 4 spring clips (5) from housing cover (spring clips retain cover to housing).
  3. Release housing cover (3) from locating tabs on housing and remove cover (3).
  4. Remove air cleaner element (filter) from housing.
  5. Clean inside of housing before replacing element.

Scheme 32

Scheme 32: Housing Assembly
Scheme 32: Housing Assembly
  1. Loosen clamp and disconnect air duct at air cleaner cover.
  2. Lift entire housing assembly (1) from 4 locating pins (2).

Scheme 33

Scheme 33: INSTALLATION
Scheme 33: INSTALLATION
  1. Install filter element into housing (1).
  2. Position housing cover into housing locating tabs.
  3. Pry up 4 spring clips and lock cover to housing.
  4. Install air duct to air cleaner cover and tighten hose clamp to 3 N.m (30 in. lbs.) torque.
  5. If any other hose clamps were removed from air intake system, tighten them to 3.4 N.m (30 in. lbs.) torque.
  6. If any bolts were removed from air resonator housing or air intake tubing, tighten them to 4.5 N.m (40 in. lbs.) torque.

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