Jeep Engines - Oljeep

4.7L POWER TECH V-8 371DESCRIPTIONValve Timing Exhaust ValveSPECIFICATIONOpens (BBDC) ...................... 232.5'Closes (ATDC) ...................... 21.25"Duration .......................... 253.75'Valve Overlap ....................... 17.75"Cylinder HeadGasket Thickness (Compressed) .. .7 mm (0.0276in.)Valve Seat Angle ................ 44.5" - 45.0"Valve Seat Runout (Max) ... 0.051 mm (0.002 in.)Intake Valve Seat Width ....... 1..75 - 2.36 mm(0.0698 - 0.0928 in.)Exhaust Valve Seat Width ...... 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.)ValvesFace Angle .................... 45.0" - 45.5"Head Diameter Intake ....... 47.87 - 48.13 mm(1.8846 1.8949 in.)(1.0227- 1.0235 in.)Bearing Clearance .......... 0.025 - 0.065 mm(0.001- 0.0026 in.)Bearing Clearance (Max. Allowable) ... 0.065 mm(0.0026 in.)End Play ........................ mm (in.)Head Diameter Exhaust ...... 36.87 - 37.13 mm(1.4516- 1.4618 in.)Length-Intake (Overall) ... 113.13 - 113.89 mm(4.4539 - 4.4839 in.)Length-Exhaust (Overall) . . 114.92 - 115.68 mm(4.5244 - 4.5543 in.)Stem Diameter-Intake ...... 6.931 - 6.957 mm(0.2729 - 0.2739 in.)Stem Diameter-Exhaust ..... 6.902 - 6.928 mm(0.2717 - 0.2728 in.)Stem-to-Guide Clearance Intake(New) ..... .026 - .043 mm (0.0011 - 0.0017 in.)Stem-to-Guide ClearanceExhaust(New) ............ .072 - .073 mm (0.0029 in.)Max. Allowable (Rocking Method&Intake ................ 0.069 mm (0.0028 in.)Max. Allowable (Rocking Method&Exhaust ............... 0.098 mm (0.0039 in.)Valve Lift (Zero LashbIntake ....... 11.25 mm(0.443 in.)Valve Lift (Zero LashbExhaust ...... 10.90 mm(0.4292 in.)DESCRIPTIONSPECIFICATIONValve SpringFree Length (Approx.)Intake & Exhaust. ......... 47.5 mm (1.870 in)Spring Force (Valve Closed)Intake & Exhaust ... 285.2-320.8 N @ 40.69 mm(64.0-72.0 lbs. Q 1.6020 in.)Spring Force (Valve Open)Intake ........... 775.3-846.7 N @ 29.29 mm(176.2-192.4 lbs. @ 1.1532 in.)Spring Force (Valve Open)Exhaust ........... 775.3-846.7 N @ 29.29 mm(176.2-192.4 Ibs. @ 1.1532 in.)Number of Coils-Intake & Exhaust ........ 6.6Wire DiameterIntake & Exhaust. ........ 4.2799 - 4.3561 mm(0.1685 - 0.1715 in.)Installed HeightIntake(Spring Seat to Bottom of Retainer) ... 40.97 mm(1.613 in.)Installed HeightExhaust(Spring Seat to Bottom of Retainer) ... 40.81 mmOil Pump(1.606 in.)Clearance Over Rotors (Max.) ... .035 - .095 mm(0.0014 - 0.0038 in.)Cover Out-of-Flat (Max.) .... .025 mm (0.001 in.)Inner and Outer Rotor Thickness .... 12.08 mm(0.4756 in.)Outer Rotor Clearance (Max.) ........ 85.96 mm(3.3843 in.)Outer Rotor Diameter (Min.) ........ 85.925 mm(0.400 in.)Tip Clearance Between Rotors (Max.) ... .150 mmOil Pressure(0.006 in.)At Curb Idle Speed * ... 25 kPa (4 psi) minimumAt 3000 rpm .................. 170 - 550 Wa(25 - 80 psi)*CAUTION: If pressure is zero at curb idle, DO NOTrun engine at 3000 rpm.