Checking ring to groove clearance

WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Checking Ring To Groove Clearance

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Clean ring groove of piston before checking.

Piston ring dimensions in mm	New	Wear limit
Compression rings	0.02 to 0.08	0.20
Oil scraping ring	0.02 to 0.08	0.15