| New | OEM |
|---|
ADDITIONAL IMAGES (IF AVAILABLE) ARE FOUND BELOW
4991240 3978019 QSB QSL Idler Pulley. Product type: Idler Pulley. Part number(s): 4991240, 3978019. Engine/model: QSB, QSL. Application notes: idler pulley for Cummins QSB, QSL engine applications. Please verify final fitment by part number, engine serial number, and application before publishing or ordering.
4991240 3978019 QSB QSL Idler Pulley. Product type: Idler Pulley. Part number(s): 4991240, 3978019. Engine/model: QSB, QSL. Application notes: idler pulley for Cummins QSB, QSL engine applications. Please verify final fitment by part number, engine serial number, and application before publishing or ordering.
| SKU | AL240CU00 |
|---|---|
| Part Number | 4991240 |
| Interchange / Replacement No. | 3978019 |
| Engine Model / Series | QSB, QSL |
| Part Type | Idler Pulley |
| Condition Options | New / Used / Remanufactured |
| Availability | Confirm by Inquiry |
For accurate matching, please provide the engine serial number, CPL, original nameplate or product photos before quotation.
Yes. Please send the engine model, ESN, CPL, original part number or clear photos. Our team can help check compatible options.
For engine parts, we can quote Original, OEM or Aftermarket options depending on stock, budget and lead-time requirements. For complete engines, options may include original, remanufactured or assembled condition.
Pricing depends on condition, availability, quantity, technical matching, packaging and destination. Please submit an inquiry for a project-based quotation.
© 2026 Truvill Resources. All rights reserved.
