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.
2008 Kia Optima L4-2.4LFACTORY OEM SERVICE PROCEDURE
Connecting Rod, Engine
Connecting rod
Connecting rod big end inner diameter
Specification 51.000 - 51.018 mm (2.0079 - 2.0086 in)
Side clearance
Specification 0.10 - 0.25 mm (0.0039 - 0.0098 in)
Limit 0.35 mm (0.0138 in)
Connecting rod bearing cap bolts 19.6 Nm (2.0 kgf-m, 14.46 lb-ft) + 90°
Connecting rod big end inner diameter
Specification 51.000 - 51.018 mm (2.0079 - 2.0086 in)
Side clearance
Specification 0.10 - 0.25 mm (0.0039 - 0.0098 in)
Limit 0.35 mm (0.0138 in)
Connecting rod bearing cap bolts 19.6 Nm (2.0 kgf-m, 14.46 lb-ft) + 90°
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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