Jeep Workshop Service and Repair Manuals

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.)