Belt Tensioner for 2001-2002 Freightliner MT55 & More - Dayco 89478

$141.99

Dayco Accessory Drive Belt Tensioner Assembly 89478

Dayco Accessory Drive Belt Tensioner Assembly 89478 - view 2

Part number: 89478

UPC: 036687808301

Condition: New

Weight: 3.50 LBS

Item Package Quantity: 1

$141.99

Current Stock: 4

Quantity:

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Dayco Accessory Drive Belt Tensioner Assembly P/N:89478

$141.99

Description

Dayco 89478 belt tensioner for the 2001-2002 Freightliner MT55 and other vehicles keeps the accessory drive belt under tension. This Dayco belt tensioner is an automatic unit with one pulley, built for a serpentine belt.

Automatic type, sold as an HD tensioner
Counter clock wise direction
Single flat pulley, 74 mm in diameter and 39.25 mm wide
Serpentine belt type

Quick facts

Part: Dayco 89478 belt tensioner
Also called: serpentine belt tensioner
Fits: 2001-2002 Freightliner MT55 and other vehicles
Position: Alternator, fan, water pump, main drive
Condition: New

Belt squeal, a fluttering belt, or a scored or wobbling pulley can mean a serpentine belt tensioner is worn, though the belt itself or a water pump bearing can be behind the same signs.

Fits

This listing is one tensioner. It is listed for a wide range of truck and bus models, including the 1999-2005 Peterbilt 320 6-cylinder 8.3L. The 2001-2002 Freightliner MT55 takes one. If your vehicle is not named here, look up its model and year in the "Vehicles it fits" section.

Specifications

Fit and size

Position: Alternator, fan, water pump, main drive
Quantity per vehicle: 1
Number of pulleys: 1
Pulley diameter: 74 mm
Pulley width: 39.25 mm
Pulley profile: flat

Build and materials

Type: Automatic
Direction: Counter clock wise
Belt type: Serpentine
Condition: New
Country of origin: United States

Interchange: 38504 · 49501 · 45820 · 45837 · 910015A · VKM910015 · 910015

Manufacturer's description

Product specs

Vehicles it fits

Interchange numbers

This part cross-references / interchanges with the following part numbers:

38504, 49501, 45820, 45837, 910015A, VKM910015, 910015

Buyer's Q&A

Frequently Asked Questions

Does the Dayco 89478 belt tensioner fit the 2001-2002 Freightliner MT55?

Yes. The Dayco 89478 is listed for the 2001-2002 Freightliner MT55, and that vehicle takes one.

What size is the pulley on the Dayco 89478?

The Dayco 89478 has one flat pulley that measures 74 mm in diameter and 39.25 mm in width.

Is the Dayco 89478 an automatic or manual tensioner?

It is an automatic tensioner with a counter clock wise direction, built for a serpentine belt, and it is sold as an HD tensioner.

How can I check this tensioner for wear?

With the engine off and cool, look at the pulley for scoring or cracks and see whether it wobbles or rubs. A shop can test spring tension and belt alignment.

Does the Dayco 89478 tensioner interchange with 910015?

Yes. 910015 is one of the interchange numbers for the Dayco 89478; the full list is on the Interchange line at the bottom of the page.