Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER HEAD ASSEMBLYVALVE, INTAKE/EXHAUST
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Valve, Intake/Exhaust
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Valve, Intake/Exhaust
Valve Head Diameter
Intake Valve Head Diameter 1.723-1.747 inch
Exhaust Valve Head Diameter 1.49-1.51 inch
Valve Face Runout Limit 0.002 inch (Max)
Valve Face Angle Limit 44°
Valve Stem Diameter
Standard Intake Valve Stem Diameter 0.3416-0.3423 inch
Standard Exhaust Valve Stem Diameter 0.3411-0.3418 inch
(0.015 Oversize) Intake Valve Stem Diameter 0.3566-0.3573 inch
(0.015 Oversize) Exhaust Valve Stem Diameter 0.3561-0.3568 inch
(0.030 Oversize) Intake Valve Stem Diameter 0.3716-.3723 inch
(0.030 Oversize) Exhaust Valve Stem Diameter 0.3711-.3718 inch
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.