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 MANUALSFORD1991AEROSTAR 2WD V6-183 3.0LREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYCONNECTING ROD, ENGINEREBUILD SPECIFICATIONS
1991 Ford Aerostar 2WD V6-183 3.0L
Rebuild Specifications
1991 Ford Aerostar 2WD V6-183 3.0LSECTION Rebuild Specifications
Connecting Rod Journal Diameter 53.983-54.003 mm (2.1253-2.1261 in.)
Connecting Rod Journal Out-of-Round Limit 0.006 mm (0.0003 in.) Maximum
Connecting Rod Journal Out-of-Round Limit 0.015 mm (0.0006 in.) TOTAL
Taper Limit 0.008 mm per 25 mm (0.0003 in. per in.)
Surface Limit (RMS) 0.25 micrometers (10.0 micro in.)
Connecting Rod Bearings
Clearance to Crankshaft Desired 0.025-0.035 mm (0.001-0.0014 in.)
Clearance to Crankshaft Allowable 0.020-0.066 mm (0.00086-0.0027 in.)
Connecting Rod Bearing Wall Thickness (Std.) 1.557-1.570 mm (0.0612-0.0618 in.)
CONNECTING ROD
Piston Pin Bore Diameter 23.105-23.145 mm (0.9096-0.9112 in.)
Crankshaft Bearing Bore Diameter 57.15-57.17 mm (2.250-2.251 in.)
Length (Center-to-Center) 140.46-140.54 mm (5.530-5533 in.)
ALIGNMENT (BORE-TO-BORE MAXIMUM DIFFERENCE)
Twist 0.075 per 25 mm (0.003 per in.)
Bend 0.04 per 25 mm (0.0016 per in.)
SIDE CLEARANCE (ASSEMBLED TO CRANK)
Standard 0.13-0.33 mm (0.006-0.014 in.)
Service Limit 0.36 mm Maximum (0.014 in. Maximum)
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.