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 MANUALSSUBARU1998FORESTER AWD F4-2.5L DOHCREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYPISTON RING, ENGINE
1998 Subaru Forester AWD F4-2.5L DOHC
Piston Ring, Engine
1998 Subaru Forester AWD F4-2.5L DOHCSECTION Piston Ring, Engine
Piston Ring Gap:
Top Ring:
Standard 0.20 - 0.35 mm (0.0079 - 0.0138 inch)
Limit 1.0 mm (0.039 inch)
Second Ring:
Standard 0.37 - 0.52 mm (0.0146 - 0.0205 inch)
Limit 1.0 mm (0.039 inch)
Oil Ring:
Standard 0.20 - 0.60 mm (0.0079 - 0.0236 inch)
Limit 1.5 mm (0.059 inch)
Clearance Between Piston Ring And Piston Ring Groove:
Top Ring:
Standard 0.040 - 0.080 mm (0.0016 - 0.0031 inch)
Limit 0.15 mm (0.0059 inch)
Second Ring:
Standard 0.030 - 0.070 mm (0.0012 - 0.0028 inch)
Limit 0.15 mm (0.0059 inch)
Top Ring:
Standard 0.20 - 0.35 mm (0.0079 - 0.0138 inch)
Limit 1.0 mm (0.039 inch)
Second Ring:
Standard 0.37 - 0.52 mm (0.0146 - 0.0205 inch)
Limit 1.0 mm (0.039 inch)
Oil Ring:
Standard 0.20 - 0.60 mm (0.0079 - 0.0236 inch)
Limit 1.5 mm (0.059 inch)
Clearance Between Piston Ring And Piston Ring Groove:
Top Ring:
Standard 0.040 - 0.080 mm (0.0016 - 0.0031 inch)
Limit 0.15 mm (0.0059 inch)
Second Ring:
Standard 0.030 - 0.070 mm (0.0012 - 0.0028 inch)
Limit 0.15 mm (0.0059 inch)
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.