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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, AWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 4.7L Engine (Service Information) >> Specifications >> 4.7L Engine
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4.7L Engine

GENERAL DESCRIPTION

DESCRIPTION  SPECIFICATION 
Engine Type 90° SOHC V-8 16-Valve
Displacement 4.7 Liters / 4701 cc
287 (Cubic Inches)
Bore 93.0 mm (3.66 in.)
Stroke 86.5 mm (3.40 in.)
Compression Ratio 9.0:1
Max. Variation Between Cylinders 25%
Horsepower 235 BHP @ 4800 RPM
Torque 295 LB-FT @ 3200 RPM
Lead Cylinder #1 Left Bank
Firing Order 1-8-4-3-6-5-7-2
CYLINDER BLOCK

DESCRIPTION  SPECIFICATION 
Metric  Standard 
Bore Diameter 93.010 ±.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 12.9 oz
Ring Groove Diameter 
No. 1 83.37 - 83.13 mm 3.282 - 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 0.010 - 0.019 mm 0.0004 - 0.0008 in.
Diameter 24.013 - 24.016 mm 0.9454 - 0.9455 in.
PISTON RINGS

DESCRIPTION  SPECIFICATION 
Metric  Standard 
Ring Gap 
Top Compression Ring 0.20 - 0.36 mm 0.0079 - 0.0142 in.
Second Compression Ring 0.37 - 0.63 mm 0.0146 - 0.0249 in.
Oil Control (Steel Rails) 0.25 - 0.76 mm 0.0099 - 0.30 in.
Side Clearance  -
Top Compression Ring .051 -.094 mm 0.0020 - 0.0037 in.
Second Compression Ring 0.040 - 0.080 mm 0.0016 - 0.0031 in.
Oil Ring (Steel Ring) .019 -.229 mm .0007 -.0091 in.
Ring Width 
Top Compression Ring 1.472 - 1.490 mm 0.057 - 0.058 in.
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.
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 Bore Diameter .025 -.048 mm -
(Interference Fit) 0.001 - 0.0019 in.
Bearing Bore Out of Round (MAX) 0.004 mm 0.0002 in.
Total Weight (Less Bearing) 555 grams 19.5771 ounces
CRANKSHAFT

DESCRIPTION  SPECIFICATION 
Metric  Standard 
Main Bearing Journal Diameter 63.488 - 63.512 mm 2.4996 - 2.5005 in.
Bearing Clearance 0.004 - 0.034 mm 0.0002 - 0.0013 in.
Out of Round (MAX) 0.005 mm 0.0004 in.
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 0.010 - 0.048 0.0004 - 0.0019 in.
Out of Round (MAX) 0.005 mm 0.0002 in.
Taper (MAX) 0.008 mm 0.0004 in.
CAMSHAFT

DESCRIPTION  SPECIFICATION 
Metric  Standard 
Bore Diameter 26.02 - 26.04 mm 1.0245 - 1.0252 in.
Bearing Journal Diameter 25.973 - 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 (BTDC) 4.4°
Closes (ATDC) 239.1°
Duration 243.5°
Exhaust 
Opens (BTDC) 240.5°
Closes (ATDC) 13.2°
Duration 253.70°
Valve Overlap 17.6°
VALVES

DESCRIPTION  SPECIFICATION 
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)
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 11.25 mm (0.443 in.)
Exhaust 10.90 mm (0.4292 in.)
VALVE SPRING

DESCRIPTION  SPECIFICATION 
Free Length (Approx)
Intake 49.0 mm (1.9291 in.)
Exhaust 49.0 mm (1.9291 in.)
Spring Force (Valve Closed)
Intake and Exhaust 313.0 - 354.0 N @ 40.12 mm
(70.365 - 79.582 lbs. @ 1.5795 in.)
Spring Force (Valve Open)
Intake and Exhaust 776.0 - 870.0 N @ 28.88 mm
(174.451 - 195.583 lbs. @ 1.137 in.)
Number of Coils
Intake 7.3
Exhaust 7.3
Wire Diameter
Intake and Exhaust 4.6 x 3.67 mm
- (0.1811 - 0.1445 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

DESCRIPTION  SPECIFICATION 
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.)
OIL PUMP

DESCRIPTION  SPECIFICATION 
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 (.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 
At Curb Idle Speed (MIN)* 48 kPa (7 psi)
@ 3000 RPM 240 - 725 kPa (35 - 105 psi)
* CAUTION: If pressure is zero at curb idle, DO NOT run engine at 3000 RPM. 
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