Jeep Workshop Service and Repair Manuals

Valve: Specifications

GENERAL SPECIFICATIONS 

Intake Valve Timing
Opens ...................................................................................................................................................................................................................  12.4 BTDC
Closes ..................................................................................................................................................................................................................  60.9 ABCD
Exhaust Valve Timing
Opens ..................................................................................................................................................................................................................  49.8 BBDC
Closes ..................................................................................................................................................................................................................  29.2 ABCD
valve overlap ...................................................................................................................................................................................................................  41.6
Intake Duration .............................................................................................................................................................................................................  253.3
Exhaust Duration ..............................................................................................................................................................................................................  259

Valves 
Length ( Tip-to-Gauge Dimension Line) Intake ...............................................................................................................  122.860mm (4.822 to 4.837 inch)
Length (tip-to-Gauge Deminsion Line) Exhaust ............................................................................................  122.860 to 123.241mm (4.837 to 4.852 inch )
Valve Stem Diameter ..............................................................................................................................................  7.899 to 7.925mm (0.001 to 0.003 inch)
Stem-to-Guide Clearence ........................................................................................................................................  0.025 to 0.076mm (0.001 to 0.003 inch)
Valve Head Diameter-
Intake ..................................................................................................................................................................  48.387 to 48.641mm (1.905 to 1.915 inch)
Valve Head Diameter-
Exhaust ...............................................................................................................................................................  37.973 to 38.227mm (1.495 to 1.505 inch)
Valve Face Angle-Intake ....................................................................................................................................................................................................  45
Valve Face angle-Exhaust ..................................................................................................................................................................................................  45
Tip Refinishing (Max. allowable) .........................................................................................................................................................  0.25mm (0.010 inch)