Cummins ISF3.8L Belt Tensioner

OE 3947574 / 5287020

Aftermarket replacement for B2B importers, distributors, wholesalers and private-label programs.

Product category: Belt Tensioners
Brand application: Cummins
OE references: 3947574 / 5287020
Application: Cummins ISF3.8L
Cross reference: DAYCO 89094

Confirm final specification and application before ordering.

PRODUCT OVERVIEW

ABOUT THIS BELT TENSIONER.

The TRUPA Cummins ISF3.8L Belt Tensioner is an aftermarket replacement belt tensioner referenced to OE numbers 3947574, 5287020, with cross references DAYCO 89094. It is listed for Cummins ISF3.8L. TRUPA supplies it to importers, distributors, wholesalers and private-label programs, with China export supply and partner-warehouse support in the USA and Brazil for eligible orders.

WHAT IT DOES

A belt tensioner keeps the correct tension on the accessory (serpentine) belt that drives the alternator, water pump, fan and air-conditioning compressor. It uses a spring-loaded arm and an idler pulley to absorb belt stretch and vibration.

APPLICATION & FITMENT

Listed for Cummins ISF3.8L. More parts for Cummins. Engine family: Cummins ISF3.8.

OE & INTERCHANGE NUMBERS

3947574
5287020
DAYCO 89094

BEFORE YOU ORDER

OE and cross-reference numbers (for example Gates, Dayco or Continental)
Engine and truck model, as some tensioners are shared across brands
Pulley type (grooved or flat), diameter and arm direction

COMMON REPLACEMENT SIGNS

Belt squeal, slipping or chirping
Tensioner arm vibrating or bouncing at idle
Noisy or rough idler pulley bearing
Premature belt wear or the belt jumping off the pulleys

Read the troubleshooting guide →

QUALITY CHECKS

Spring torque, pulley bearing quality and arm pivot wear decide service life, so these are checked against the original part. How TRUPA approaches quality control.

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