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 Ford Focus L4-2.0LFACTORY OEM SERVICE PROCEDURE
Piston Ring, Engine
Piston Rings
Width
Top 1.17-1.185 mm (0.0460-0.0466 in)
2nd 1.197-1.199 mm (0.0471-0.0472 in)
Oil 2.38-2.45 mm (0.093-0.096 in)
Ring gap (in bore)
Top 0.16-0.31 mm (0.006-0.012 in)
2nd 0.33-0.48 mm (0.012-0.018 in)
Oil 0.2-0.7 mm (0.007-0.027 in)
Ring groove width
Top 1.203-1.205 mm (0.0473-0.0474 in)
2nd 1.17-1.19 mm (0.0.460-0.0468 in)
Oil 2.501-2.503 mm (0.0984-0.0985 in)
Width
Top 1.17-1.185 mm (0.0460-0.0466 in)
2nd 1.197-1.199 mm (0.0471-0.0472 in)
Oil 2.38-2.45 mm (0.093-0.096 in)
Ring gap (in bore)
Top 0.16-0.31 mm (0.006-0.012 in)
2nd 0.33-0.48 mm (0.012-0.018 in)
Oil 0.2-0.7 mm (0.007-0.027 in)
Ring groove width
Top 1.203-1.205 mm (0.0473-0.0474 in)
2nd 1.17-1.19 mm (0.0.460-0.0468 in)
Oil 2.501-2.503 mm (0.0984-0.0985 in)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.