Description
MA3E – PAI 181887 is a 180°F (82°C) engine coolant thermostat for a broad range of Cummins diesel applications. It is a non-vented thermostat and is commonly used in dual-thermostat configurations. PAI lists it as a direct replacement for Cummins 4336659.
Common applications include:
- Cummins N14
- Cummins ISX / ISX15
- Cummins M11 / ISM / QSM11
- Cummins L10
- Cummins ISB / QSB / B-series
- Certain 4.5L and 6.7L Cummins applications
- Specs:
180°F / 82°C opening temperature, approximately 3.19 in OD, 2.27 in ID, non-vented. The gasket is typically not included.


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