Product Function & Specs:

4025072 is identified as a standard piston kit for selected Cummins engine applications. The kit is used during engine repair or rebuilding work to restore piston-related components.

Parts catalogues associate the kit with piston body 3972880, piston ring set 4089258, piston pin 3934047, and piston pin retainers 3920691. The listed kit configuration and application must be confirmed using the engine serial number and service parts catalogue.

The standard-size designation should not be used without checking cylinder bore condition and required piston clearance.

Failure Symptoms:

• Excessive oil consumption or crankcase blow-by
• Reduced compression and engine performance
• Piston or cylinder wear identified during engine inspection

Quick Installation Notes:

• Verify the engine ESN, CPL, piston specification, and standard bore requirement before installation.
• Measure cylinder bore, piston clearance, and ring end gap according to the applicable service manual.
• Install the piston, pin, retainers, and ring set using the correct orientation and prescribed procedures.

Maintenance Tips:

• Use the specified engine oil and follow the recommended maintenance intervals.
• Monitor oil consumption, crankcase pressure, smoke, and compression-related symptoms.
• Inspect piston crowns, ring grooves, cylinder walls, and connecting components during overhaul.

FAQ:

Q: What is Cummins 4025072?

A: 4025072 is a standard piston kit for selected Cummins diesel engine applications.

Q: Which components are included?

A: Catalogues identify piston body 3972880, piston ring set 4089258, piston pin 3934047, and piston pin retainers 3920691 within the standard kit configuration. Confirm the supplier’s package contents before ordering.

Q: Which engines use this piston kit?

A: Public listings associate the part with selected ISB, QSB, and 4B applications. Exact compatibility requires the engine serial number and CPL verification.

Q: Is this an OEM or aftermarket replacement?

A: This product is supplied as a new aftermarket replacement. It is not represented as a genuine Cummins factory part.

Q: What should be checked before ordering?

A: Confirm the engine ESN, CPL, piston size, cylinder bore condition, ring-set reference, and kit contents before placing an order.

Why Sourcing From WinsParts?

WinsParts supports part-number and engine-configuration checks before quotation, helping parts dealers and repair workshops reduce ordering errors. Worldwide export and shipping coordination is available.