Sierra 18-4030 Volvo Penta Timing Belt - Replaces 30731772Sierra replacement timing belt for Volvo Penta engines. Meets or exceeds OEM Belt specifications; Chemical and contaminant resistance for long life; Positive slip proof engagement; Fiberglass tension member for excellent flex and elongation behavior; Interchangeable with: Volvo Penta; 30731772; 31258305; 31359568;