Description
PAI Industries 180881 serpentine belt tensioner with 8-groove pulley for Cummins ISC 8.3L and ISL 8.3L engines. Direct replacement for Cummins 3973819 — the OE accessory-drive belt tensioner used on medium-duty Freightliner M2 / 108SD chassis and Kenworth T370/T440/T470 trucks built with the ISC/ISL 8.3L from roughly 2007 through 2015.
Signs You Need a New Belt Tensioner
- Audible squeal or chirp from the front of the engine, especially on cold starts
- Belt slipping, glazing, or fraying on the edges
- Visible wobble in the tensioner pulley with the engine running
- Tensioner arm at full travel (out of adjustment range) with a new belt installed
- Cracks or grease weep around the tensioner spring housing
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 180881 |
| Part Type | Serpentine Belt Tensioner (accessory drive) |
| Pulley | 8-groove (V-ribbed) |
| Engine Compatibility | Cummins ISC 8.3L, ISL 8.3L |
| OEM Reference | Cummins 3973819 |
Cross References
This belt tensioner replaces or is equivalent to the following part numbers:
- Cummins: 3973819
- PAI Industries: 180881
Applications
This belt tensioner fits the following Cummins engines:
- Cummins ISC 8.3L (2007–2014)
- Cummins ISL 8.3L (2008–2015)
Representative vehicles using these engines:
- Freightliner Business Class M2 (2007–2015 with ISC / ISL)
- Freightliner 108SD (2013–2014 with ISC / ISL)
- Kenworth T370 (2011–2015 with ISC / ISL)
- Kenworth T440, T450, T470 (2010–2012 with ISC / ISL)
Confirm pulley groove count (8-rib) before ordering — some ISC/ISL applications use a 6- or 10-groove tensioner depending on accessory drive configuration.
