Checking Piston-Ring Vertical Clearance

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Clean ring groove on piston before checking clearance.

Piston Ring	New [mm]	Wear Limit [mm]
1st Compression Ring	0.04... 0.08	0.20
2nd Compression Ring	0.03... 0.07	0.20
Oil Scraper Ring	0.02... 0.06	0.15

Fig 1: Checking Piston-Ring Vertical Clearance

Courtesy of PORSCHE CARS NORTH AMERICA, INC.