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Home >> Audi >> 2017 >> A7 Quattro Competition >> Repair and Diagnosis >> External Pages >> Different car >> Section 114 (Engine System (Crankshaft & Cylinder Block - Service Information - 4.0L - CEUC, CRDB, CTGE, CWUB, CWUC)) >> Crankshaft, Cylinder Block >> Piston And Connecting Rod >> Pistons And Cylinder Bore, Checking >> Piston Gap Checking

Piston Gap Checking

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GWWA13-11228Courtesy of AUDI OF AMERICA, LLC

-- Push the piston ring squarely from above down to approximately 15 mm from the bottom end of the cylinder.

-- Use a piston without a piston ring for sliding in.

Piston Ring New mm Wear Limit mm
1st Compression ring 0.20 to 0.35 0.80
2nd Compression ring 0.20 to 0.40 0.80
Oil scraping ring 0.20 to 0.40 0.80
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