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 MANUALSSUBARU2010OUTBACK SPORT F4-2.5L SOHCREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYPISTON RING, ENGINE
2010 Subaru Outback Sport F4-2.5L SOHC
Piston Ring, Engine
2010 Subaru Outback Sport F4-2.5L SOHCSECTION Piston Ring, Engine
Piston ring
Piston ring gap mm (in)
Top ring Standard 0.20 - 0.35 (0.0079 - 0.0138)
Second ring Standard 0.37 - 0.52 (0.0146 - 0.0205)
Oil ring Standard 0.20 - 0.50 (0.0079 - 0.0197)
Clearance, piston ring groove mm (in)
Top ring Standard 0.040 - 0.080 (0.0016 - 0.0031)
Second ring Standard 0.030 - 0.070 (0.0012 - 0.0028)
Piston ring gap mm (in)
Top ring Standard 0.20 - 0.35 (0.0079 - 0.0138)
Second ring Standard 0.37 - 0.52 (0.0146 - 0.0205)
Oil ring Standard 0.20 - 0.50 (0.0079 - 0.0197)
Clearance, piston ring groove mm (in)
Top ring Standard 0.040 - 0.080 (0.0016 - 0.0031)
Second ring Standard 0.030 - 0.070 (0.0012 - 0.0028)
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.