Vauxhall Workshop Service and Repair Manuals

Pistons and Piston Rings - Vectra-B, Omega-B  

The X 20 DTH engine has minor differences in the piston installation height and piston ring height relative to the X 20 DTL.

Survey of piston ring heights:  

Engine		X 20 DTL	X 20 DTH
1st ring - rectangular compression ring	mm	2.00	-
1st ring - full keystone ring	mm	-	2.50
2nd ring - taper-face compression ring	mm	1.75	2.00
3rd ring - double bevelled ring	mm	3.00	3.00