Description
Dayco 89440 automatic accessory-drive belt tensioner for Cummins ISX, ISX15, X15, and QSX 15.0L engines. Direct replacement for Cummins 3691282 (current EPA13 XPI service number), 4299091, 4299051, 3682946, and 2871292. Spring-loaded one-piece assembly with integrated idler pulley maintains constant belt tension across the alternator, water pump, fan, and AC compressor drive on the front of the engine.
Signs You Need a New Belt Tensioner
- Squealing or chirping noise from the front of the engine, especially on cold start
- Visible belt slip, glazing, or chunking on the serpentine belt
- Tensioner arm bouncing, vibrating, or hitting the stop while the engine runs
- Pulley wobble, bearing growl, or grease leakage from the pulley center
- Loose belt that can be deflected past the spec range with finger pressure
- Cracks at the tensioner mounting boss or the arm casting
Specifications
| Manufacturer | Dayco |
|---|---|
| Part Number | 89440 |
| Part Type | Automatic Belt Tensioner Assembly |
| Engine Compatibility | Cummins ISX, ISX15, X15, QSX 15.0L |
| Includes | Tensioner arm, spring, pivot, integrated pulley |
| Warranty | 2-year manufacturer warranty |
Cross References
This part replaces or is equivalent to the following part numbers:
- Cummins: 3691282, 4299091, 4299051, 3682946, 2871292
- Mack: 2428-89440
- International / Navistar: 1883020C2
- PAI Industries: 180885
- Continental Elite: 49563
- Goodyear: 49598
- Bando: 680040, 680054
- Kit Masters: 689440
- Tendeco / Litens: 910074, 910074A
Applications
This belt tensioner fits Cummins X-series 15.0L engines, including:
- Cummins ISX15 / ISX 15.0L (2010-2016, EPA10/EPA13 XPI fuel system)
- Cummins X15 15.0L (2017-present)
- Cummins QSX15 15.0L industrial / off-highway
Representative trucks using these engines:
- Freightliner Cascadia, Coronado with ISX15/X15 (2010-present)
- Kenworth T680, T880, W900, T800 with ISX15/X15 (2010-present)
- Peterbilt 579, 567, 389, 388, 386 with ISX15/X15 (2010-present)
- International ProStar, LoneStar, LT with ISX15/X15 (2010-2017)
- Volvo VNL, VNR with Cummins ISX15/X15 (2010-present)
Verify your engine serial number and front-cover configuration before ordering. The 89440 is the EPA13 XPI service tensioner; earlier ISX Signature/CM870 engines used different tensioners.
