Need a new belt tensioner for your Cummins diesel engine? This aftermarket replacement (part number 3967188) is a great option. It's compatible with a range of Cummins engines like the QSB6.7, 6C8.3, 6B5.9, 4B3.9, B4.5, QSL9, and CM554 models. It directly replaces OEM numbers 3967188, 3936202, 3934817, 3918944, and the popular Dayco 89478. A good tensioner is key – it keeps the right amount of pressure on the accessory belt (like for the alternator, water pump) so everything runs smoothly and doesn't squeal or slip. This one is built for stable performance and reliability. Please note this is not an original Cummins part; it's a quality aftermarket replacement manufactured by PODAFU. Comes as a single tensioner unit. A straightforward swap to keep your engine's belt drive in top shape.
