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 MANUALSAUDI2007S8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICAL5.2L - ENGINE MECHANICAL, ENGINE CODE(S): BSM13 - ENGINE - CRANKSHAFT, CYLINDER BLOCKPISTON AND CONNECTING ROD, DISASSEMBLING AND ASSEMBLINGPISTON AND CONNECTING ROD, COMPONENT OVERVIEWMEASURING PISTON RING SIDE CLEARANCE

2007 Audi S8

Measuring piston ring side clearance

2007 Audi S8SECTION Measuring piston ring side clearance

Fig 1: Measuring Piston Ring Side Clearance

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Clean ring groove of piston before checking.

Piston ring dimensions in mm	New	Wear limit
1. Compression ring	0.035 to 0.085	0.200
2. Compression ring	0.005 to 0.045	0.200
Oil scraping ring	0.01 to 0.05	0.15

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.