Image unavailable Alfa Marine Spare Parts is an independent supplier and is not an authorized CUMMINS dealer. CUMMINS names and part numbers are used for identification purposes only.
Product image not available
Request a quote for this part.
CUMMINS Marine Parts
ADAPTER CRANKSHAFT
Availability: 2-7 days
Shipping: Worldwide
ADAPTER,CRANKSHAFT #3
Product Details
Part Number
3903784
Description
ADAPTER,CRANKSHAFT #3
Brand
CUMMINS
Category
Crankshaft
Availability
2-7 days
Shipping
Worldwide
Price
On Request
Product Description
CUMMINS Engine shaft 3903784
1. Product Overview
CUMMINS Engine shaft 3903784 is listed under source title “ADAPTER CRANKSHAFT”. It is classified for this pilot as engine shaft within the rotating or timing mechanism system. The source record does not establish an exact engine model. Confirm the complete engine model, serial number, arrangement, and installed reference before ordering.
2. Function and Operating Principle
A shaft transmits torque, supports rotating components, or controls timed engine motion. Journal dimensions, gear or spline interfaces, balance, hardness, and configuration must match the exact assembly.
The shaft rotates within bearings while carrying gears, cams, impellers, couplings, or connecting-rod loads. Lubrication, alignment, runout, surface finish, and thrust control are central to service condition.
3. Application Status
| Manufacturer / brand | CUMMINS |
|---|---|
| Part number | 3903784 |
| Component category | Engine shaft |
| System | Rotating or timing mechanism |
| Evidence level | C — Component identity only |
| Engine application | Not established by the supplied record |
4. Typical Signs That Inspection May Be Required
| Observation | Possible significance |
|---|---|
| Abnormal vibration, knock, or timing noise | May involve the shaft, bearings, gears, alignment, or driven components. |
| Scored or discolored journals | Can indicate lubrication failure, contamination, overload, or incorrect clearance. |
| Excessive runout or end movement | Requires measurement of the shaft and support system. |
| Damaged spline, keyway, gear, or cam surface | May prevent correct torque transfer or timing. |
These observations are inspection triggers rather than a confirmed diagnosis. Evaluate the complete engine system and follow the applicable manufacturer service information.
5. Inspection and Replacement Guidance
- Identify the exact shaft type and installation position.
- Inspect journals, fillets, thrust faces, gears, splines, and oil drillings.
- Measure runout and dimensions using manufacturer limits.
- Confirm standard or repair size and engine arrangement.
6. Information Required Before Ordering
- Complete engine or equipment model.
- Engine serial number and arrangement or configuration number.
- Installed part reference and clear photographs of the identification label.
- Installation position and related assembly information.
Compatibility notice: Verify 3903784 against serial-number-specific parts documentation before purchase or installation. Do not select the component by appearance or part-number similarity alone.