Volvo T6 Closed Decking ServiceFor Volvo T6 Engine Blocks Our closed decking services for Volvo T6 engines address the prevalent issue of cylinder liner cracking in the gaps between cylinders. By implementing a closed deck, we provide robust support for the cylinder outer walls. Precise steel shims, cut to exact gap forms, fill these spaces, eliminating cylinder flex in this critical area. What is Closed Decking? Closed decking involves machining the top plane of the engine case