Sierra Marine engine parts are designed to meet or exceed the OEM part they are intended to replace and they are backed by the SeaStar Solutions Two-Year Warranty—one of the best in the business. We offer a variety of Sierra engine parts for most engine applications on the water today—including MerCruiser, OMC, Johnson/Evinrude, Volvo and more. Key Features of Sierra V-Belts High-strength synthetic cords resist shock load Low-stretch properties assure uniform performance over the life of the belt Special rubber compound section assures smooth and even transfer of load forces to the cords Cogs are molded to precise engineering tolerances to improve flexibility and maintain cord support Rubber edges maintain positive, no-slip contact with pulley grooves V-Belt Applications Sierra Part # Application Replaces OEM Part # Effective Length Top Width Model 18-15550 Mallory 9-55000 55" or 139.7cm 29/64" or 11.5mm 10533602 18-15550 MerCruiser Stern Drive 57-13458, 57-13458T, 57-13458Q 55" or 139.7cm 29/64" or 11.5mm 10533602 18-15490 Mallory 9-55007 52 1/2" 29/64" or 11.5mm 10533560 18-15490 MerCruiser Stern Drive 57-816295T, 57-816295Q 52 1/2" 29/64" or 11.5mm 10533560 18-15290 MerCruiser Stern Drive 57-53215, 57-53215T, 57-13457T, 57-13457, 57-13457Q 29" or 73.7cm 29/64" or 11.5mm 10533438 18-15480 Mallory 9-55003 48" or 121.9cm 29/64" or 11.5mm 4378360 18-15480 MerCruiser Stern Drive 57-48122, 57-48122Q 48" or 121.9cm 29/64" or 11.5mm 4378360 18-15300 MerCruiser Stern Drive 57-49756 30" or 76.2cm 29/64" or 11.5mm 10533446 18-15370 Mallory 9-55005 37" or 94cm 29/64" or 11.5mm 10533479 18-15370 MerCruiser Stern Drive 57-65607, 57-65607Q 37" or 94cm 29/64" or 11.5mm 10533479 18-15370 Mercury Marine 57-65607T 37" or 94cm 29/64" or 11.5mm 10533479 18-15345 MerCruiser Stern Drive 57-74271, 57-74271Q 34 1/2" or 87.6cm 29/64" or 11.5mm 10533461 18-15345 Mercury Marine 57-74271T 34 1/2" or 87.6cm 29/64" or 11.5mm 10533461 18-15470 MerCruiser Stern Drive 57-78200, 57-78200A1, 57-78200Q1 47" or 119.4cm 29/64" or 11.5mm 4378428 Engine Parts Selector If you do not see the V-Belt (or other engine part) you need, please visit the Sierra Engine Parts Selector, where you can search by engine make, model, serial number or year of manufacture.Features & Specifications Manufacturer Part Number: 18-15345
