Sierra Belt 18-15400 for MerCruiser and OMC, 40"
- Brand:
- Sierra
- Part no:
- 18-15400
Image: Powerboat Supply
Where to buy
View on Amazonpaid link
This Sierra belt, 18-15400, is a cogged belt with an effective length of 40" and a top width of 29/64". Its OEM cross references are 57-32850, 57-69143T and OMC 311606. High strength synthetic cords resist shockload failure, and the rubber edges grip the pulley grooves without slipping. The cog shape is meant to give air a large area to move over, keeping heat from building up in the cushion section.
Our take
The molded cogs are the feature here: the maker says their shape gives the belt a large area for air circulation. At 40" effective length, that and the cross reference numbers are what to match against your old belt.