Sierra’s 18-4638 Piston Kit features a 3.515/STBD bore size and a 0.015 O.S. It is designed for use with various Mercury/Mariner outboard engines. The kit is interchangeable with Mercury Marine 785-9738T10. Each Sierra product meets or exceeds the original equipment part it replaces.
Bore Size: 3.515/STBD; 0.015 O.S.
Designed for use with various Mercury/Mariner outboard engines
Interchangeable with Mercury Marine 785-9738T10
Each Sierra product meets or exceeds the original equipment part it replaces
