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 MANUALSSUBARU2008FORESTER F4-2.5L DOHC TURBOREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYPISTON, ENGINE
2008 Subaru Forester F4-2.5L DOHC Turbo
Piston, Engine
2008 Subaru Forester F4-2.5L DOHC TurboSECTION Piston, Engine
Piston
Outer diameter Standard
A 99.505 - 99.515 mm (3.9175 - 3.9179 in)
B 99.495 - 99.505 mm (3.9171 - 3.9175 in)
0.25 (0.0098) OS 99.745 - 99.765 mm (3.9270 - 3.9278 in)
0.50 (0.0197) OS 99.995 - 100.015 mm (3.9368 - 3.9376 in)
Clearance between piston and piston pin
Standard 0.004 - 0.008 mm (0.0002 - 0.0003 in)
Limit 0.020 mm (0.0008 in)
Outer diameter Standard
A 99.505 - 99.515 mm (3.9175 - 3.9179 in)
B 99.495 - 99.505 mm (3.9171 - 3.9175 in)
0.25 (0.0098) OS 99.745 - 99.765 mm (3.9270 - 3.9278 in)
0.50 (0.0197) OS 99.995 - 100.015 mm (3.9368 - 3.9376 in)
Clearance between piston and piston pin
Standard 0.004 - 0.008 mm (0.0002 - 0.0003 in)
Limit 0.020 mm (0.0008 in)
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.