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Specifications - 3.7L Engine

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
GENERAL SPECIFICATIONS

DESCRIPTION SPECIFICATION
Type 90° SOHC V6 12 Valve
Number of Cylinders 4
Firing Order 1-6-5-4-3-2
Lead Cylinder No. 1 Left Bank
Compression Ratio 9.2.1
Max. Variation Between Cylinders 25%
Metric  Standard 
Displacement 3.7 Liters 226 Cubic Inches
Bore 93.0 mm 3.66 in.
Stroke 90.8 mm 3.40 in.
Horsepower 210@5200 RPM
Torque 225ft. lbs. @4200 PRM
Compression Pressure 1172-1551 kPa 170-225 psi
CYLINDER BLOCK

DESCRIPTION SPECIFICATION
Metric Standard
Bore Diameter 93.0 +/- .0075 mm 3.6619 +/- 0.0003 in.
Out of Round (MAX) 0.076 mm 0.003 in.
Taper (MAX) 0.051 mm 0.002 in.
PISTONS

DESCRIPTION SPECIFICATION
Metric Standard
Diameter 92.975 mm 3.6605 in.
Weight 366 grams 12.91 oz
Ring Groove Diameter  No. 1 83.73 - 83.13 mm 3.296 - 3.273 in
No. 2 82.833 - 83.033 mm 3.261 - 3.310 in.
No. 3 83.88 - 84.08 mm 3.302 - 3.310 in.
PISTON PINS

DESCRIPTION SPECIFICATION
Metric Standard
Clearance in Piston 0.006 - 0.015 mm 0.0002 - 0.0005 in.
Diameter 24.017 - 24.020 mm 0.9455 - 0.9456 in.
PISTON RINGS

DESCRIPTION SPECIFICATION
Metric Standard
Ring Gap 
Top Compression Ring
Second Compression Ring
Oil Control (Steel Rails)		 0.20 - 0.36 mm
0.37 - 0.63 mm
0.25 - 0.76 mm		 0.0079 - 0.0142 in.
0.0146 - 0.0249 in.
0.0099 - 0.30 in.
Side Clearance 
Top Compression Ring
Second Compression Ring
Oil Ring (Steel Ring)		 .051 - .094 mm
0.040 - 0.080 mm
.019 - .229 mm		 0.0020 - 0.0037 in.
0.0016 - 0.0031 in.
.0007 - .0091 in.
Ring Width 
Top Compression Ring
Second Compression Ring
Oil Ring (Steel Rails)		 1.472 - 1.490 mm
1.472 - 1.490 mm
0.445 - 0.470 mm		 0.057 - 0.058 in.
0.057 - 0.058 in.
0.017 - 0.018 in.
CONNECTING RODS

DESCRIPTION SPECIFICATION
Metric Standard
Bearing Clearance 0.015 - 0.055 mm 0.0006 - 0.0022 in.
Side Clearance 0.10 - 0.35 mm 0.004 - 0.0138 in.
Piston Pin Clearance .015 - .028 mm 0.0006 - 0.0011 in.
Bearing Bore Out of Round (MAX) 0.004 mm 0.0002 in.
Total Weight (Less Bearing) 612 grams 21.588 ounces
CRANKSHAFT

DESCRIPTION SPECIFICATION
Metric Standard
Main Bearing Journal Diameter 63.488 - 63.512 mm 2.4996 - 2.5005 in.
Bearing Clearance 0.002 - 0.034 mm -
Out of Round (MAX) 0.005 mm 0.0002 in.
Taper (MAX) 0.006 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 57.908 - 57.892 mm -
Bearing Clearance 0.015 - 0.055 -
Out of Round (MAX) 0.005 mm 0.0002 in.
Taper (MAX) 0.006 mm 0.0002 in.
CAMSHAFT

DESCRIPTION SPECIFICATION
Metric Standard
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

DESCRIPTION SPECIFICATION
Intake 
Opens (ATDC)
Closes (ATDC)
Duration		 0.0°
236°
36°
Exhaust 
Opens (BTDC)
Closes (ATDC)
Duration		 233°
17°
250°
Valve Overlap 17°
VALVES

DESCRIPTION SPECIFICATION
Metric Standard
Face Angle 45° - 45.5°
Head Diameter
Intake
Exhaust		 48.52 - 48.78 mm
36.87 - 37.13 mm		 1.9103 - 1.9205 in.
1.4516 - 1.4618 in.
Length (Overall)
Intake
Exhaust		 113.45 - 114.21 mm
114.92 - 115.68 mm		 4.4666 - 4.4965 in.
4.5244 - 4.5543 in.
Stem Diameter
Intake
Exhaust		 6.931 - 6.957 mm
6.902 - 6.928 mm		 0.2729 - 0.2739 in.
0.2717 - 0.2728 in.
Stem - to - Guide Clearance
Intake
Exhaust		 0.018 - 0.069 mm
0.047 - 0.098 mm		 0.0008 - 0.0028 in.
0.0019 - 0.0039 in.
Max. Allowable
Stem - to - Guide Clearance (Rocking Method)
Intake
Exhaust		 0.069 mm
0.098 mm		 0.0028 in.
0.0039 in.
Valve Lift (Zero Lash)
Intake
Exhaust		 12.00 mm
10.90 mm		 0.472 in.
0.4292 in.
VALVE SPRING

DESCRIPTION SPECIFICATION
Metric Standard
Free Length (Approx)
Intake
Exhaust (without damper)		 48.92 mm
48.2 mm		 1.9260 in.
1.897 in.
Spring Force (Valve Closed)
Intake
Exhaust (without damper)
Spring Force (Valve Open)
Intake		 361.0 - 390.0 N @ 40.12 mm
356 - 394 N @ 39.12 mm
984.0 - 1040.0 N @ 28.12 mm		 81.15 - 87.67 lbs. @ 1.5795 in.
80.031 - 88.574 lbs. @ 1.540 in.
221.2 - 233.8 lbs. @ 1.107 in.
Exhaust (without damper) 874 - 956 N @
27.12 mm		 196.483 - 214.917 lbs. @ 1.067 in.
Number of Coils Intake Exhaust 7.30
7.15
Wire Diameter
Intake
Exhaust		 4.77 x 3.80mm
4.66 x 3.72mm		 0.1878 - 0.1496 in.
0.144 - 0.146 in.
Installed Height (Spring Seat to Bottom of Retainer) Nominal
Intake
Exhaust (with damper)		 40.12 mm
40.12 mm		 1.579 in.
1.579 in.
CYLINDER HEAD

DESCRIPTION SPECIFICATION
Metric Standard
Gasket Thickness (Compressed) 0.7 mm 0.0276 in.
Valve Seat Angle 44.5° - 45.0°
Valve Seat Runout (MAX) 0.051 mm 0.002 in.
Valve Seat Width
Intake
Exhaust		 1.75 - 2.36 mm
1.71 - 2.32 mm		 0.0698 - 0.0928 in.
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

DESCRIPTION SPECIFICATION
Metric Standard
Clearance Over Rotors/End Face (MAX) 0.095 mm 0.0038 in.
Cover Out - of - Flat (MAX) 0.025 mm 0.001 in.
Inner and Outer Rotor Thickness 12.02 mm 0.4731 in.
Outer Rotor to pocket (Diametral) clearance (MAX) .235 mm 0.0093 in.
Outer Rotor Diameter (MIN) 85.925 mm 0.400 in.
Tip Clearance Between Rotors (MAX) 0.150 mm 0.006 in.
OIL PRESSURE

SPECIFICATION SPECIFICATION
Metric Standard
At Curb Idle Speed (MIN)(1) 25 kPa 4 psi
@ 3000 rpm 170 - 758 kPa 25 - 110 psi
CAUTION:
(1) If pressure is zero at curb idle, DO NOT run engine at 3000 rpm.
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