Dodge Nitro. Manual - part 7

CONNECTING RODS 

CRANKSHAFT 

CAMSHAFT 

VALVE TIMING 

Second Compression Ring

1.472 - 1.490 mm

0.057 - 0.058 in.

Oil Ring (Steel Rails)

0.445 - 0.470 mm

0.017 - 0.018 in.

DESCRIPTION 

SPECIFICATION 

Metric 

Standard 

Bearing Clearance

0.006 - 0.044 mm

0.0002 - 0.0017 in.

Side Clearance

0.10 - 0.35 mm

0.004 - 0.0138 in.

Piston Pin Clearance

0.015 - 0.028 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

DESCRIPTION 

SPECIFICATION 

Metric 

Standard 

Main Bearing Journal Diameter

63.488 - 63.512 mm

2.4996 - 2.5005 in.

Bearing Clearance

0.002 - 0.046 mm

0.00008 - 0.0018 in.

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

2.2798 - 2.2792 in.

Bearing Clearance

0.006 - 0.044

0.0002 - 0.0011 in.

Out of Round (MAX)

0.005 mm

0.0002 in.

Taper (MAX)

0.006 mm

0.0002 in.

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

0.075 -0.200 mm

0.003 - 0.0079 in.

End Play (MAX)

0.200 mm

0.0079 in.

DESCRIPTION 

SPECIFICATION 

Intake 

Opens (BTDC)

5.6°

 

2007 Dodge Nitro R/T 

2007 ENGINE 3.7L - Service Information - Nitro

  

VALVES 

VALVE SPRING 

Closes (ATDC)

240.1°

Duration

245.7°

Exhaust 

Opens (BTDC)

241.5°

Closes (ATDC)

20.1°

Duration

261.6°

Valve Overlap

25.7°

DESCRIPTION 

SPECIFICATION 

Metric 

Standard 

Face Angle

45° - 45.5°

Head Diameter 

Intake

48.52 - 48.78 mm

1.9103 - 1.9205 in.

Exhaust

36.87 - 37.13 mm

1.4516 - 1.4618 in.

Length (Overall) 

Intake

113.45 - 114.21 mm

4.4666 - 4.4965 in.

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

12.00 mm

0.472 in.

DESCRIPTION 

SPECIFICATION 

Metric 

Standard 

Free Length (Approx.) 

Intake

48.18 mm

1.896 in.

Exhaust - w/damper

49.2 mm

1.973 in.

Spring Force (Valve Closed) 

Intake 332.0 - 368.0 N @ 40.12 mm

74.63 - 82.72 lbs. @ 1.5795 in.

Exhaust - (without damper) 356 - 394 N @ 39.12 mm

80.031 - 88.57 lbs. @ 1.54 in.

Spring Force (Valve Open) 

 

2007 Dodge Nitro R/T 

2007 ENGINE 3.7L - Service Information - Nitro

  

CYLINDER HEAD 

OIL PUMP 

OIL PRESSURE 

Intake 948.0 - 1038.0 N @ 28.12 mm

213.2 - 233.8 lbs. @ 1.107 in.

Exhaust - without damper 874 - 956 N @ 27.12 mm

196.5 - 214.9 lbs. @ 1.067 in.

Number of Coils 

-

-

Intake

7.30

Exhaust

7.15

Wire Diameter 

-

-

Intake

4.77 x 3.80 mm

0.1878 x 0.1496 in.

Exhaust

4.66 x 3.72 mm

0.1843 x.1464 in.

Installed Height (Spring Seat to 
Bottom of Retainer) 
Nominal 

Intake

40.12 mm

1.579 in.

Exhaust - w/damper

40.12 mm

1.579 in.

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

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.

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 (Diameter) 

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.

SPECIFICATION 

SPECIFICATION 

Metric 

Standard 

 

2007 Dodge Nitro R/T 

2007 ENGINE 3.7L - Service Information - Nitro

  

TORQUE SPECIFICATIONS 

TORQUE SPECIFICATIONS 

At Curb Idle Speed (MIN)*

25 kPa

4 psi

@ 3000 rpm

170 - 758 kPa

25 - 110 psi

* CAUTION: If pressure is zero at curb idle, DO NOT run engine at 3000 rpm. 

DESCRIPTION 

N.m 

Ft. 

In. 

 

-

Lbs. 

Lbs. 

Camshaft

-

-

-

Non - Oiled Sprocket Bolt

122

90

-

Bearing Cap Bolts

11

-

100

Counterbalance shaft retaining bolt

28

-

250

Timing Chain Cover Bolts

58

43

-

Connecting Rod Cap Bolts

27

20

-

 

PLUS 90° TURN 

Bed Plate-Bolts

Refer to Procedure

Crankshaft Damper Bolt

175

130

-

Cylinder Head Bolts

M11 Bolts

Refer To Procedure

M8 Bolts

Refer To Procedure

Cylinder Head Cover Bolts

12

-

105

Exhaust Manifold Bolts

25

18

-

Exhaust Manifold Heat Shield Nuts

8

-

72

 

Then loosen 45°

Flexplate Bolts

95

70

-

Engine Mount Bracket to Block Bolts

61

45

-

Rear Mount to Transmission Bolts

46

34

-

Generator Mounting Bolts

M10 Bolts

54

40

-

M8 Bolts

28

-

250

Intake Manifold Bolts

12

-

105

 

Refer to Procedure for

 

Tightening Sequence

Oil Pan Bolts

15

-

130

Oil Pan-Drain Plug

34

25

-

Oil Pump Bolts

28

-

250

Oil Pump Cover Bolts

12

-

105

Oil Pickup Tube Bolt and Nut

28

-

250

Oil Dipstick Tube to Engine

-

-

-

Block Bolt

15

-

130

Oil Fill Tube Bolts

12

-

105

 

2007 Dodge Nitro R/T 

2007 ENGINE 3.7L - Service Information - Nitro