jleamont Report post Posted May 22, 2017 I figured I would post this service bulletin for anyone with a DD13 engine in their coach. Proactively replacing the belts on your engine with the revised part numbers might just save you a road call. Problem; the belt material causes the tensioner to bounce violently thus wearing out the pivot, when this occurs the pulley's will lean outward and throw the belts off. The new design belt is stronger and doesn't make the tensioner dance. If you make an appointment just make sure the dealer actually installs the revised belts and not old stock on their shelves. The Service bulletin attached doesn't mention Coaches, but the one I saw at the dealer had the exact same set up as the trucks, and it was getting a tensioner and a pair of belts, towed in off of the highway. 17TS9.pdf Share this post Link to post Share on other sites
five Report post Posted May 22, 2017 Thanks, Joe, good information. Share this post Link to post Share on other sites
