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 BLOCK ASSEMBLYCRANKSHAFT, ENGINEREBUILD SPECIFICATIONS
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Rebuild Specifications
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Rebuild Specifications
Main Bearing Journal Diameter 2.399-2.3982 inch
Main Bearing Journal Out-of-Round Limit 0.0006 inch (Max)
Main Bearing Journal Taper Limit 0.0006 Per Inch
Main Bearing Journal Runout Limit 0.002 inch (Max)
Main Bearing Journal Surface Finish (RMS) 12 (Max)
Main Bearing Journal Runout Service Limit 0.005 inch
Thrust Bearing Journal Length 1.201-1.199 inch
Connecting Rod Journal Diameter 2.0462-2.0472 inch
Connecting Rod Journal Out-of-Round Limit 0.0006 inch (Max)
Connecting Rod Journal Taper Limit 0.0006 Per Inch (Max)
Connecting Rod Journal Surface Finish (RMS) 12 (Max)
Main Bearing Thrust Face Surface Finish (RMS) 35 Front/25 Rear (Max)
Main Bearing Thrust Face Runout Limit 0.001 (Max)
Flywheel Clutch Face Runout Limit 0.005 inch
Flywheel Ring Gear Lateral Runout (T.I.R.) Standard Transmission 0.025 inch
Flywheel Ring Gear Lateral Runout (T.I.R.) Automatic Transmission 0.060 inch
Crankshaft Free End Play Limit 0.004-0.008 inch
Crankshaft Free End Play Service Limit 0.012 inch
Connecting Rod Bearings Clearance to Crankshaft - Desired 0.0008-0.0015 inch
Connecting Rod Bearings Clearance to Crankshaft - Allowable 0.0008-0.0026 inch
Connecting Rod Bearing Wall Thickness (Standard) 0.0619-0.0624 inch
If 0.002 Undersize, Add 0.001 to Standard Thickness.
Main Bearings Clearance to Crankshaft - Desired 0.0008-0.0015 inch
Main Bearings Clearance to Crankshaft - Allowable 0.0008-0.0026 inch
Main Bearing Wall Thickness (Standard) 0.0956-0.0951 inch
If 0.002 Undersize, Add 0.001 to Standard Thickness.
Connecting Rod:
Crankshaft Bearing Bore Diameter 55.170-55.190 mm (2.1720-2.1728 in.)
Crankshaft Bearing Bore Out-of-Round Limit 0.0004 inch
Crankshaft Bearing Bore Taper Limit 0.0004 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.