Checking Piston-Ring End Clearance

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Slide in the ring at a right angle to the cylinder wall from above until it is approx. 50 mm away from the edge of the cylinder. Use a piston with no rings for sliding into the cylinder.

Fig 1: Checking Piston-Ring End Clearance
Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Piston-Ring Dimensions In mm	New In mm	Wear Limit In mm
1st Compression Ring	0.25... 0.40	0.60
2nd Compression Ring	0.70... 0.90	1.20
Oil Scraper Ring	0.25... 0.50	0.70