Checking piston ring gap

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2006 Volkswagen GTI, 2005 Volkswagen Jetta, 2005 Volkswagen GTI, 2004 Volkswagen Jetta, and 2004 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Checking Piston Ring Gap

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Special tools, testers and auxiliary items required

Feeler gauge

Insert ring into lower cylinder bore at a right angle from above, approx. 15 mm from cylinder edge.

Piston ring		Gap
		New	Wear limit
Compression rings	mm	0.15 to 0.40	0.8
Oil scraping ring	mm	0.25 to 0.50	1.00