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Truck Diesel Engine QSX ISX Fan Belt Tensioner 2891940

Fan Belt Tensioner 2891940 Parameter:

1. The tensioner acts on the timing belt or timing chain of the engine to guide and tighten it, so that it is always in a good tension state. Generally divided into two methods: hydraulic and mechanical, both of which can automatically adjust the tension of the timing belt and timing chain. Under the drive of the timing belt or timing chain, the camshaft drives the valve to open and close at the correct time, and cooperates with the piston to complete the four processes of intake, compression, power and exhaust.

2. The tensioner provides pressure directed at the belt or chain, the tensioner pulleys are in direct contact with the timing belt, and the guide rails are in direct contact with the timing chain, and they run with the belt or chain while applying the tensioner-provided pressure to it , so that they maintain the appropriate degree of tension.

3. Application for Heavy duty truck, buses, engineering machinery, mining machinery, petroleum machinery, railway machinery, port machinery, stationary and mobile diesel generator set power stations, Marine propulsion unit and auxiliary power unit, pump power units and other power units, automobile industry power ships.


Truck Diesel Engine QSX ISX Fan Belt Tensioner 2891940

Product Name:

Truck Diesel Engine QSX ISX Fan Belt Tensioner 2891940

Part Number:


Part Name:

Belt Tensioner

Engine Model:

ISX QSX Diesel Engine​


Truck, Tractor, Forklift, Loader, Excavator, Bulldozer, Generator, Marine, etc.


6 months

Payment Terms:

T/T, Western Union, MoneyGram, L/C and so on.


By sea, by air, by express, 1-3 days out of factory, 1 week time for express, 15 days for air, 30 days for sea/train


1. As for stock, we can provide sample
2. 24 hours online service
3. Provide PT Fuel System Agent service
4. OEM/ODM service and One-stop purchasing service

Related Parts

Other engine parts

Engine piston


3096681 3096682

Cylinder liner



Piston ring

6 sets


Main bearing​

1 set


Connecting rod bearing

1 set


Camshaft bushing

7 pcs


Repair kits

upper & lower

3800728 3801007

Engine gas valve

intake & exhaust

3035110 207241

What are the symptoms of a bad belt tensioner?

- Rust bleed and cracks. Appearance: Rust is bleeding between arm and base or dripping from the tensioner.

- Pulley bearing wear.

- Pulley wear.
- Tensioner assembly misalignment.
- Tensioner noise.
- Tensioner arm misalignment.
- Excessive tensioner arm oscillation.
- Binding or grinding tensioner arm movement.


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