Measuring The Piston Ring Gap

WARNING: This page is about a different car, the 2010 Audi A5, 2009 Audi A5, and 2008 Audi A5. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Checking Piston Ring Gap

Courtesy 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
1. Compression ring	0.35 to 0.50	0.8
2. Compression ring	0.60 to 0.80	1.0
Oil scraping ring	0.25 to 0.50	0.8