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 MANUALSFORD1991RANGER 4WD V6-245 4.0LREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINECYLINDER BLOCK ASSEMBLYCRANKSHAFTSPECIFICATIONSGENERAL SPECIFICATIONS
1991 Ford Ranger 4WD V6-245 4.0L
General Specifications
1991 Ford Ranger 4WD V6-245 4.0LSECTION General Specifications
Main Bearing Journal Diameter 2.2433-2.2441
Main Bearing Out-Of-Round 0.0006
Main Bearing Taper Limit 0.0006 per inch
Main Bearing Journal Runout 0.002 Max.
Main Bearing Surface Finish (RMS) 12
Main Bearing Runout Service Limit 0.005
Thrust Bearing Journal Length 1.039-1.041
Connecting Rod Journal Diameter 2.1252-2.1260
Connecting Rod Journal Out-Of-Round 0.0006
Connecting Rod Journal Taper Limit 0.0006 per inch
Connecting Rod Journal Surface Finish (RMS) 12 Max.
Main Bearing Thrust Face Surface Finish 2O Max.
Main Bearing Runout (T.I.R.) 0.001 Max.
Crankshaft Free End Play 0.016-0.0126
Crankshaft Free End Play Service Limit 0.012
Connecting Rod Bearings
Desired Clearance to Crankshaft 0.0003-0.0024
Allowable Clearance to Crankshaft 0.0005-0.0022
Connecting Rod Bearing Wall Thickness (Std.) Red 0.0548-0.0552
Connecting Rod Bearing Wall Thickness (Std.) Blue 0.0552-0.0556
Main Bearing Desired Clearance to Crankshaft 0.0008-0.0015
Main Bearing Allowable Clearance to Crankshaft 0.0005-0.0019
Main Bearing Wall Thickness (Std.) Red 0.0707-0.0710
Main Bearing Wall Thickness (Std.) Blue 0.0711-0.0714
Main Bearing Out-Of-Round 0.0006
Main Bearing Taper Limit 0.0006 per inch
Main Bearing Journal Runout 0.002 Max.
Main Bearing Surface Finish (RMS) 12
Main Bearing Runout Service Limit 0.005
Thrust Bearing Journal Length 1.039-1.041
Connecting Rod Journal Diameter 2.1252-2.1260
Connecting Rod Journal Out-Of-Round 0.0006
Connecting Rod Journal Taper Limit 0.0006 per inch
Connecting Rod Journal Surface Finish (RMS) 12 Max.
Main Bearing Thrust Face Surface Finish 2O Max.
Main Bearing Runout (T.I.R.) 0.001 Max.
Crankshaft Free End Play 0.016-0.0126
Crankshaft Free End Play Service Limit 0.012
Connecting Rod Bearings
Desired Clearance to Crankshaft 0.0003-0.0024
Allowable Clearance to Crankshaft 0.0005-0.0022
Connecting Rod Bearing Wall Thickness (Std.) Red 0.0548-0.0552
Connecting Rod Bearing Wall Thickness (Std.) Blue 0.0552-0.0556
Main Bearing Desired Clearance to Crankshaft 0.0008-0.0015
Main Bearing Allowable Clearance to Crankshaft 0.0005-0.0019
Main Bearing Wall Thickness (Std.) Red 0.0707-0.0710
Main Bearing Wall Thickness (Std.) Blue 0.0711-0.0714
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.