Cummins QSB3.3 Idler Pully 2011-2020: OEM 5320974
CUMMINS QSB3.3 IDLER PULLY 2011-2020: OEM 5320974
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured, Tamerx Idler Pully, Tamerx part number 5320974TX ( OEM Part Number 5320974 ).This part is primarily made for a Cummins QSB3.3, production years 2011-2020, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 5320974 |
| Additional OEM | 5320974 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | |
| WEIGHT | 2.00 LBS |
SHIPPING OPTIONS
Ship Weight : 2.00 LBS
UPS Ground, 2nd Day Air, Next Day Air
SHIPPING POLICY
Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.
The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.
Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.
Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".
If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.
As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.
What is a Core Charge?
A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.
30 Day Core Charge Hold
You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.
"This Product Doesn't Have a Core"
Built to maintain proper belt routing and smooth accessory operation, the OEM 5320974 Idler Pulley fits Cummins QSB3.3 engines produced from 2011 to 2020. This pulley helps guide the engine’s drive belt with stable rotation, reducing wear and minimizing the risk of belt misalignment during operation. Its OEM-grade construction supports accurate fitment, dependable bearing performance, and longevity under continuous load and vibration. When symptoms such as belt noise, visible wobble, or bearing deterioration appear, this pulley offers a reliable replacement option. Manufactured with durable materials and precise engineering, it supports consistent operation across all compatible QSB3.3 applications within this model range.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2011 | Cummins | QSB3.3 | ||||
| 2012 | Cummins | QSB3.3 | ||||
| 2013 | Cummins | QSB3.3 | ||||
| 2014 | Cummins | QSB3.3 | ||||
| 2015 | Cummins | QSB3.3 | ||||
| 2016 | Cummins | QSB3.3 | ||||
| 2017 | Cummins | QSB3.3 | ||||
| 2018 | Cummins | QSB3.3 | ||||
| 2019 | Cummins | QSB3.3 | ||||
| 2020 | Cummins | QSB3.3 | ||||
PEOPLE ALSO ASKS | BLOG(S)
The idler pulley used on Cummins QSB3.3 engines from 2011–2020 (OEM 5320974) plays an essential role in the engine’s belt-driven accessory system. Although small, this component ensures the serpentine belt stays properly tensioned and aligned as it drives key accessories such as the alternator, water pump, and other belt-powered components.
The idler pulley acts as a guided support point for the serpentine belt. It helps maintain the correct routing path and prevents slack that could cause belt misalignment or slipping. By keeping the belt running smoothly and under consistent movement, the pulley ensures all engine accessories continue to operate as intended.
Key Functions of the Idler Pulley
- Maintains belt alignment
- so the belt stays on its proper track
- Supports correct belt tension
- by working with the tensioner system
- Reduces belt vibration and noise
- during engine operation
- Prevents premature wear
- on the belt and accessory components
- Ensures steady operation
- of belt-driven systems such as the cooling and charging systems
A worn or failing idler pulley can lead to belt squealing, misalignment, loss of accessory function, or even complete belt failure. The OEM 5320974 pulley is engineered specifically for the Cummins QSB3.3, ensuring proper fit and long-term reliability. Keeping this component in good condition helps maintain smooth engine operation and prevents costly downtime.
The idler pulley helps guide and support the serpentine belt as it moves around the engine’s accessories. When the pulley begins to fail, it often shows clear signs that should not be ignored. Catching these symptoms early helps prevent bigger issues like belt damage or unexpected breakdowns.
Common signs your idler pulley needs replacement include:
- Squealing or chirping noises when the engine is running
- Visible wobbling of the pulley while the belt is moving
- Grinding or rough rotation when the pulley is spun by hand
- Cracks, chips, or wear on the pulley surface
- Loose or misaligned serpentine belt
A failing pulley often starts with noise caused by worn bearings. Over time, the pulley may seize or wobble, which can cause the serpentine belt to slip, fray, or break. If the belt fails, several engine accessories can stop working immediately.
During routine service, ask your technician to inspect the pulley, bearings, and belt tension. If the pulley shows rough movement or visible damage, replacement is recommended.
Addressing idler pulley issues early keeps your belt system running smoothly and helps prevent unexpected repairs.
It helps guide and maintain proper tension on the engine’s accessory drive belt.
Squealing noises, belt vibration, or visible wobble around the pulley may occur.
Yes, excessive play can shift the belt off track and affect accessory performance.
It should be checked during belt replacement or when chirping or grinding sounds appear near the front of the engine.
Cummins Idler Pullys
