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 MECHANICALFUEL SYSTEM5.2L - ENGINE MECHANICAL, ENGINE CODE(S): BSM13 - ENGINE - CRANKSHAFT, CYLINDER BLOCKPISTON AND CONNECTING ROD, DISASSEMBLING AND ASSEMBLINGPISTON AND CONNECTING ROD, COMPONENT OVERVIEWPISTON RING END GAP, MEASURING
2007 Audi S8
Piston ring end gap, measuring
2007 Audi S8SECTION Piston ring end gap, measuring
- Slide piston ring down from above at a right angle to cylinder wall until it is approximately 15 mm from bottom edge of cylinder.
- When sliding in, use a piston without piston rings.
| Piston ring dimensions in mm | New | Wear limit |
|---|---|---|
| 1. Compression ring | 0.20 to 0.35 | 0.80 |
| 2. Compression ring | 0.20 to 0.40 | 0.80 |
| Oil scraping ring | 0.20 to 0.40 | 1) |
| 1) Not determined yet. | ||
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.