DAY89947

Name: FleetoneWD
Address: 1000 Northbrook Drive, Suite 100, Trevose, 19053, PA
Telephone: 2157855175

Belt Tensioner (D11/D13)

4.5 Ratings

Feature	Specification
Part number	Dayco 89947 accessory drive belt tensioner assembly
Design	2‑piece heavy‑duty dual tensioner (inner and outer units)
Application focus	Detroit Diesel DD13/DD15/DD16 accessory serpentine systems in Freightliner/Western Star and similar trucks
Belt type	Serpentine / multi‑rib belt
Number of pulleys	3 smooth pulleys total (dual tensioner layout)
Rotation direction	Clockwise
Construction	High‑strength steel / powdered‑metal arms with flat‑spring and dual pressed‑in bearings
Service concept	Two‑piece assembly allows separate replacement of front or rear section to reduce labor time

Includes

Complete dual‑arm tensioner assembly (front and rear sections) pre‑assembled.
All integrated smooth pulleys with pressed‑in bearings, ready to bolt on in place of the OE DD‑series dual tensioner.

Engineered as a service‑friendly upgrade over OE DD‑series dual tensioners, reducing installation time and improving durability in high‑load heavy‑duty applications.
Maintains consistent belt tension to drive alternator, A/C compressor, water pump, and other accessories on DD13/DD15/DD16 engines while minimizing belt noise and slippage.

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