Dayco 5100640 serpentine belt for the 2018-2025 Freightliner 114SD 6-cylinder 12.8L and other vehicles carries engine power to the fan and the air conditioning.
A worn belt can show cracks, fraying or a squeal in normal driving. A squeal on its own does not prove the belt is at fault, because a worn tensioner or pulley can make noise too. The quantity per truck is one, and this listing is one belt.
The vehicles it fits include the 2013-2023 Freightliner 122SD and the 2008-2018 Freightliner Cascadia 6-cylinder 14.8L, the 2009-2021 Cascadia 6-cylinder 12.8L and the 2011-2019 Cascadia 15.6L, along with many other Freightliner, International and Western Star trucks.
Fit and size
Build and materials
Interchange: 25-100640 · 25-100640HD · 25-100643HD
10K640 · K100640HD · 10PK1625 · 10PK1630 · K100640 · 4100640 · 4100640X · 4100642F · 640K10 · K100643HD · 4100642
This part cross-references / interchanges with the following part numbers:
Is this a Freightliner Cascadia serpentine belt for the 2008-2018 6-cylinder 14.8L, the 2009-2021 6-cylinder 12.8L or the 2011-2019 15.6L?
Yes, Dayco 5100640 fits the 2008-2018 Freightliner Cascadia 6-cylinder 14.8L, the 2009-2021 Cascadia 6-cylinder 12.8L and the 2011-2019 Cascadia 15.6L. For another truck, look up its year and engine on the Buyer's Guide tab.
What temperatures can this Dayco drive belt handle?
The listed operating range runs from -45 °F to 212 °F, which is -42.7 °C to 100 °C.
Is the Dayco 5100640 made of EPDM?
Yes. Dayco 5100640 is EPDM, aramid reinforced, with a K-section cross section, a straight rib profile and standard rib depth.
How can I tell this Dayco fan belt is worn?
With the engine off, look along the ribs for cracks, fraying or glazing.
Does Dayco 5100640 replace belt number 25-100640?
Yes. 25-100640 is one of the numbers this belt replaces. The other cross-reference numbers are on the Interchange line.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.