Grand Cherokee 4WD V8-4.7L (2003)
Valve: Specifications
VALVE TIMING
Intake
Opens (ATDC) ................................................................................................................................................................................................ 3.6 degrees
Closes (ATDC) ........................................................................................................................................................................................... 247.1 degrees
Duration ..................................................................................................................................................................................................... 243.5 degrees
Exhaust
Opens (BTDC) ........................................................................................................................................................................................... 232.5 degrees
Closes (ATDC) ............................................................................................................................................................................................. 21.2 degrees
Duration ................................................................................................................................................................................................... 253.70 degrees
Valve Overlap .............................................................................................................................................................................................. 17.6 degrees
VALVES
Face Angle ................................................................................................................................................................................... 45 degrees - 45.5 degrees
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 - .098 mm (0.0019 - 0.0039 in.)
Maximum 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.)