Q7 Quattro V6-3.6L (BHK) (2007)
7 -
Piston
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Checking
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Mark installed location to connecting rod and affiliation to cylinder
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Shallow side of piston head faces cylinder block center
8 -
Piston rings
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Compression rings
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Offset gaps by 120 Degrees
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Use piston ring pliers for removal and installation
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Mark "TOP" must face toward piston head
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Checking ring gap
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Check piston ring groove clearance
9 -
Piston ring
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Oil scraping ring
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3-part
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Install upper steel ring so gap is offset by 120° to neighboring compression ring
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Offset all oil scraping ring component gaps to each other
Piston ring gap, checking
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Slide piston ring from above into lower cylinder opening as follows, using piston without piston ring.
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Right angle to cylinder wall.
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Until approx. 15 mm from bottom edge of cylinder.
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Measure with feeler gauge.
Ring to groove clearance, checking
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Clean piston ring groove.
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Measure with feeler gauge.