Profile: Coates International Ltd. offers CSRV rotary cylinder heads. Our spherical port-type rotary valve system is incorporated with conventional reciprocating engines by replacing the traditional noisy cumbersome high pumping-loss poppet valve-train. We design natural gas engines, which features patented CSRV technology, ultra low emissions, CSRV head requires zero maintenance for life of engine and low fuel pressure. We deliver wheel bearing assembly that ensures the proper positioning of the wheel bearings during assembly.