Complete Idler Pulley Upgrade Kit
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Includes pulley with bolt, our SMX modified spacer, nut, and washer.

Below is an article we had initially posted about a DIY approach to this upgrade.  By popular demand we began offering this as a kit which is “almost” bolt in ready.  This kit includes the spacer that has been drilled on the lathe for a 7/16″ bolt.  It also includes the bolt, nut and washer in Grade 8.  The only step you must perform on the engine is to drill the threaded hole to the larger 7/16″ size.  If access is too much of an issue, or you don’t have the tools to drill through steel, consider our OEM idler pulley as it will not require any drilling. 

Idler Pulley Upgrade Kit
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Includes Grade 8 bolt, our SMX modified spacer, nut, and washer.

Idler Pulley Issues on Cummins 6BT / 6BTA 5.9
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For the Cummins Marine B & C series engines released in the late 80’s to early 90’s, the idler pulley arrangement had an unacceptable failure rate. The engineers updated the idler pully support arrangement and that basically solved the issue … Read More

Tony’s Tips
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Search Tony’s Tips Search for: Tony knows what it takes to drive marine diesel performance, design, and engineering. Here he packs his knowledge and wisdom into brief articles and tips that will allow you to better maintain and understand your … Read More