Confirmed context
Offered as an articulated piston assembly for Cummins QSL9 engines. Confirm the engine model and CPL for the exact application.
Part-number sourcing · Cummins QSL9 engine reference
Cummins QSL9 Articulated Piston Assembly 3966721 / 4941393
Quick answer: Cummins 3966721 is an articulated piston assembly for QSL9 engines, cross-referenced with 4941393. Public catalog cross-references for this reference are still being confirmed; send your engine details and old-part markings for checking.
- Reference
- 3966721
- Related reference
- 4941393
- Product type
- Articulated piston assembly
- Engine family
- Cummins QSL9
Reference to be verified with the engine model, CPL/nameplate and old-part markings before quotation.
View Packaging & Export Guide
OEM & Reference Number Matching
Scroll horizontally to read catalog relationships and buyer guidance →
| Reference | Catalog / Brand Source | Relationship | Buyer Guidance |
|---|---|---|---|
| 3966721 | Cummins OE | Articulated piston assembly for QSL9 engines | Send this reference with the engine model and CPL. |
| 4941393 | Cummins OE | Related reference in the same group | Confirm the exact variant with your old part before order. |
| — | Confirmed cross-reference pending | To be verified (strategy B) | Send the old-part markings so we can match the exact reference. |
Shared catalog references should be verified against the engine model, CPL/nameplate and existing part markings before substitution. Cross-reference association only; it does not imply a genuine Cummins part.
Compatibility & Identification
Verify before substitution
Match the bore, crown and ring configuration to the supplied engine details.
Information needed before order
- Engine model, CPL and nameplate
- Old-part markings and photos
- Quantity and destination
| Catalog-listed engine context | Buyer guidance |
|---|---|
| Cummins QSL9 | Confirm with the exact engine model and CPL. |
Confirm the bore and ring configuration before order
Cummins 3966721 is cataloged as an articulated piston assembly. Bore sizes, crowns and ring configurations differ, so match the specification together with the complete old-part reference and engine data.
Verification workflow
- Record the complete engine model, CPL and nameplate.
- Photograph the old piston from all sides, including crown and markings.
- Record every reference exactly, including related forms.
- Compare the offered reference and dimensions with the catalog evidence.
- Resolve any substitute, bore, or ring question before order confirmation.
Quality & Inspection
Available checks, photos, measurements, and documents are confirmed with the quotation.
View inspection requirements
Inspection requirements to request
- Part-number and visible-marking confirmation
- Bore and ring-groove dimension check when target measurements are supplied
- Material and coating documentation when required
- Packaging and packing-list review
Include requirements with the enquiry.
Send any target measurements, photo angles, inspection needs, and document requirements for confirmation in the quotation.
Ordering & Export
Packaging
Export-standard packaging with anti-corrosion protection. Packaging method, labeling, grouping, export documents, and receiving requirements are confirmed with the quotation.
Shipping
Provide the destination country and preferred transport mode for quotation.
Related Cummins Engine Parts
Explore other components in the Cummins engine parts range.
Procurement FAQ
What does the Cummins 3966721 / 4941393 piston assembly fit?
Cummins 3966721 is offered as an articulated piston assembly for QSL9 engines, with related reference 4941393. Public catalog cross-references are still being confirmed — send your engine model, CPL and old-part markings and we will verify before quotation.
Is a cross-reference number available?
A confirmed cross-reference is pending verification. Send the old-part markings and we will match the exact reference for you.
How do I verify the 3966721 fits my engine?
Send your engine model, CPL and photos of the old piston and its markings. We will cross-reference the reference and confirm before order.
How should I organize a multi-part enquiry?
Send the engine model, CPL, the old-part markings and the full list of parts you need in one message. We will check each against the catalog and reply with one consolidated quote.
