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Home >> Jeep >> 1990 >> Cherokee Laredo, 2D Utility, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 4.0L 6-CYL - VIN [L] & 4.2L 6-CYL - VIN [T] >> Engine Specifications >> Valve/Valve Spring Specifications

Valve/Valve Spring Specifications

VALVES & VALVE SPRINGS SPECIFICATIONS

Application In. (mm)
Intake Valves
Face Angle
4.0L 45°
4.2L 29°
Head Diameter
4.0L 1.91 (48.5)
4.2L 1.792 (45.52)
Minimum Margin .031 (.79)
Minimum Refinish Length
4.0L 4.827 (122.61)
4.2L 4.7945 (121.780)
Stem Diameter
4.0L .312 (7.93)
4.2L .3725 (9.462)
Valve Tip Maximum Refinish .010 (.25)
Exhaust Valves
Face Angle
4.0L 45°
4.2L 44°
Head Diameter
4.0L 1.5 (38)
4.2L 1.411 (35.84)
Minimum Margin .031 (.79)
Minimum Refinish Length
4.0L 4.827 (122.6)
4.2L 4.7945 (121.780)
Stem Diameter
4.0L .312 (7.93)
4.2L .3725 (9.462)
Valve Tip Maximum Refinish .010 (.25)
Valve Springs
Free Length
4.0L 1.82 (46.2)
4.2L 1.99 (50.6)
Pressure (1)
4.0L
Valve Closed 66-74 @ 1.625 (29.96-33.59 @ 41.2)
Valve Open 205-220 @ 1.2 (93.07-99.88 @ 30.48)
4.2L
Valve Closed 64-72 @ 1.76 (29.38-32.69 @ 45.4)
Valve Open 188-202 @ 1.411 (85.35-91.71 @ 35.84)
Installed Valve Spring Height
4.0L 1.625 (41.29)
4.2L (2)
(1) Lbs. @ In. (Kg @ mm).
(2) Specification not provided from manufacturer.