Wrangler 4WD L4-150 2.5L VIN P MFI (1998)
Valve: Specifications
Valve Lift
Exhaust .................................................................................................................................................................................... 10.528mm (0.4145 in.)
Intake ...................................................................................................................................................................................... 10.350 mm (0.4075 in.)
Length (Tip-to-Gauge Dimension Line)
Intake ...................................................................................................................................................... 124.435 to 125.070 mm (4.899 to 4.924 in.)
Exhaust ................................................................................................................................................... 125.120 to 125.755 mm (4.927 to 4.952 in.)
Valve Stem Diameter .......................................................................................................................................... 7.899 to 7.925 mm (0.311 to 0.312 in.)
Stem-to-Guide Clearance ..................................................................................................................................... 0.025 to 0.076 mm (0.001 to 0.003 in.)
Valve Head Diameter
Intake .......................................................................................................................................................... 43.387 to 48.641 mm (1.905 to 1.915 in.)
Exhaust ....................................................................................................................................................... 37.973 to 38.227 mm (1.495 to 1.505 in.)
Valve Face Angle-Intake ........................................................................................................................................................................................ 45°
Valve Face Angle-Exhaust ..................................................................................................................................................................................... 45°
Top Refinishing (Max. Allowable) ............................................................................................................................................... 0.25 mm (0.010 in.)
Exhaust Valve Timing
Opens ........................................................................................................................................................................................................ 52.8 BBDC
Closes ........................................................................................................................................................................................................ 26.2° ATDC
Intake Valve Timing
Opens ....................................................................................................................................................................................................... 15.4° BTDC
Closes ........................................................................................................................................................................................................ 58° ABDC
Valve Overlap ............................................................................................................................................................................................................ 41.6°
Intake Duration ........................................................................................................................................................................................................ 253.3°
Exhaust Duration ....................................................................................................................................................................................................... 259.°
