RS 4 Quattro Sedan V8-4.2L (BNS) (2007)
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If tight, heat piston to 60° C
6 - Circlip
7 - Piston
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Installation position of pistons
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Checking
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Install with piston ring compressor
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Measuring cylinder bore
8 - Piston rings
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Offset gaps by 120°
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Use piston ring pliers for removal and installation
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"TOP" marking or inscribed side must point to piston head
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Gap, measuring
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Measuring side clearance
Piston ring end gap, measuring
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Slide piston ring down from above at a right angle to cylinder wall until it is approximately 15 mm from bottom edge of cylinder.
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When sliding in, use a piston without piston rings.
Measuring piston ring side clearance
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Clean ring groove of piston before checking.
