Dayco 5081125 serpentine belt for the 2007 Western Star 4900FA 11.1L or 12.5L and other vehicles turns the engine's belt-driven accessories, such as the alternator and air conditioning. This Dayco serpentine belt loops around the accessory pulleys and carries engine power to each one.
A worn belt can show cracks across the ribs, frayed edges or a shiny, glazed surface when you look at it with the engine off. A squeal alone does not prove the belt is the problem, since a worn tensioner or a failing pulley bearing can make a similar noise.
The vehicles it fits include the 2007 Western Star 4900SA 12.5L and the 1994-2004 International 3800 V8 7.3L. Each of them takes a single belt. If your truck or bus is not named here, look it up in the "Vehicles it fits" section.
Fit and size
Build and materials
Interchange: 25-081124 · 25-081124HD
8K1124 · K081124HD · K081124 · 4081124 · 4081124X
This part cross-references / interchanges with the following part numbers:
Does the Dayco 5081125 serpentine belt fit the 2007 Western Star 4900SA 12.5L?
Yes. Dayco 5081125 is listed for the 2007 Western Star 4900SA 12.5L, and that truck takes one belt.
Is this Dayco drive belt sold with a tensioner or pulleys?
No. This listing is one belt only, 8 ribs and 112.60 in (2860.04 mm) long, with no tensioner or pulleys.
What temperature range does this Dayco fan belt work in?
Dayco 5081125 operates from -45 F to 212 F (-42.7 C to 100 C).
What is the Dayco 5081125 belt made of?
The belt is EPDM with aramid reinforcement. It has a K-section straight rib profile with 8 ribs and standard rib depth.
How do I tell whether a serpentine belt on my truck is worn?
With the engine off, look for cracks across the ribs, frayed edges or a shiny glazed surface. Any of these can mean the belt has reached the end of its life.
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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.
