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 MANUALSBMW2011335I 2D CONVERTIBLE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE - REPAIR - E93PISTON WITH RINGS AND PIN11 25 671 REPLACING PISTON RINGS ON ALL PISTONS (N55)
2011 BMW 335i 2D Convertible, Automatic
11 25 671 Replacing piston rings on all pistons (N55)
2011 BMW 335i 2D Convertible, AutomaticSECTION 11 25 671 Replacing piston rings on all pistons (N55)
Necessary preliminary tasks
- Remove all PISTONS .
Measuring side clearance of piston rings in piston ring groove.
NOTE:
It is not possible to measure the axial clearance of the M-flex rings.
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.