Dayco 5100670 serpentine belt for the 2008-2010 Mack LEU and other vehicles drives the fan and water pump from the engine. This Dayco drive belt grips the pulley grooves with its ribbed face, so the accessories turn with the engine.
Cracks, fraying or a chirp from the belt area can mean the belt is worn. A seized pulley, a weak tensioner or a failing fan or water pump bearing can make similar noise, so find which one it is before you buy a belt.
This belt fits the 2008-2010 Mack LEU, the 2008-2009 Mack MRU and the 2002-2004 Kenworth W900 6-cylinder 14.9L (L6-14.9L). The 2008-2010 Mack LEU takes one belt, and so do the rest; this listing is a single belt.
Fit and size
Build and materials
Interchange: 25-100670 · 25-100670HD
10K670 · K100670HD · 10PK1700 · 10PK1705 · K100670 · 4100670
This part cross-references / interchanges with the following part numbers:
Is the Dayco 5100670 the right belt for the 2002-2004 Kenworth W900 6-cylinder 14.9L?
Yes. The Dayco 5100670 fits the 2002-2004 Kenworth W900 6-cylinder 14.9L, and it also fits the 2008-2009 Mack MRU.
What is this Dayco serpentine belt made of?
This belt is EPDM, aramid reinforced, with a straight rib profile and a K-section cross section.
What operating temperatures is this Dayco fan belt rated for?
It operates from -45 °F to 212 °F (-42.7 °C to 100 °C) and is listed to SAE J1459 and SAE J2432.
How do I check a belt like this for wear?
With the engine off and cool, look along the ribs for cracks, fraying or a shiny glazed surface. A chirp or squeal while driving can also point to wear.
Does the Dayco 5100670 replace the K100670 belt?
Yes. K100670 is an interchange number for the Dayco 5100670, along with 10PK1700 and 25-100670.
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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.