We still have various Yanmar S4D106 engine parts available. This is a 16 valve S4D106 engine. The engine fits a Komatsu WB91R TLB. Also Komatsu WB93R and WB97R. Parts still available: Bell housing Blocks Camshafts Conrods Cylinder head Flywheel Gear injector pumps Pistons Rocker shafts Sumps Tappet covers Timing gear covers Timing gear front case"Yanmar S4D106 Engine Spares"