Caterpillar

Add Equipment

Select equipment to view parts that fit your equipment.
No Suggested Results

Select Store

Register
Caterpillar

Select Store

For pricing & availability

Add Equipment

To find the parts that fit.To find the parts that fit.
Search for part number or name

Select Store

Add Equipment

HomeUpgrade & Repair KitsRepair & Service KitsEnginesEngine Gasket Kits421-9725: Engine Overhaul (Top End) Kit
HomeUpgrade & Repair KitsRepair & Service KitsEnginesEngine Gasket Kits421-9725: Engine Overhaul (Top End) Kit
421-9725: Engine Overhaul (Top End) Kit

Marine Bundled Repair Solution, 3412 Engine Overhaul

Brand: Cat

Product Images
421-9725: Engine Overhaul (Top End) Kit
421-9725: Engine Overhaul (Top End) Kit

Marine Bundled Repair Solution, 3412 Engine Overhaul

Brand: Cat

Warranty Information
Return Policy
Items included

No results available.

305-6843: 21.08mm Inner Diameter Lifter Guide Spring
305-6843: 21.08mm Inner Diameter Lifter Guide SpringQuantity: 24
3E-6773: 94.84mm Inside Diameter Seal-O-Ring
3E-6773: 94.84mm Inside Diameter Seal-O-RingQuantity: 2
420-4427: Heat Exchanger Install Gasket Kit
420-4427: Heat Exchanger Install Gasket KitQuantity: 1
1R-1808: Engine Oil Filter
1R-1808: Engine Oil FilterQuantity: 2
198-1517: 1.2mm Thick Cylinder Block Cover Gasket
198-1517: 1.2mm Thick Cylinder Block Cover GasketQuantity: 1
420-4423: Single Cylinder Head Install Kit
420-4423: Single Cylinder Head Install KitQuantity: 2
114-4427: 2.46 x 19.18mm 78A HNBR O-Ring
114-4427: 2.46 x 19.18mm 78A HNBR O-RingQuantity: 2
1R-0749: Secondary Fuel Filter
1R-0749: Secondary Fuel FilterQuantity: 2
226-4753: 0.35mm Thick Metal Coated Gasket
226-4753: 0.35mm Thick Metal Coated GasketQuantity: 2
6V-5063: 2.95 x 23.47mm 70A EPDM O-Ring
6V-5063: 2.95 x 23.47mm 70A EPDM O-RingQuantity: 1
248-5513: Engine Water Temperature Regulator
248-5513: Engine Water Temperature RegulatorQuantity: 2
420-6457: Oil Cooler and Lines Gasket Kit
420-6457: Oil Cooler and Lines Gasket KitQuantity: 1
420-5696: Fuel Systemtem Gasket Kit
420-5696: Fuel Systemtem Gasket KitQuantity: 1
176-8167: Aftercooler & Lines Install Gasket Kit
176-8167: Aftercooler & Lines Install Gasket KitQuantity: 1
106-1792: 100mm Long Taper Lock Steel Stud
106-1792: 100mm Long Taper Lock Steel StudQuantity: 24
3E-6916: 3/8''-16 Hex Nut
3E-6916: 3/8''-16 Hex NutQuantity: 8
124-1858: 3.53 x 53.57mm 75A FKM O-Ring
124-1858: 3.53 x 53.57mm 75A FKM O-RingQuantity: 1
Showing 1 to 17 of 17
DescriptionSpecificationsCompatible Models
Specifications for part number 421-9725

We are still working on adding a specification for this part.

Compatible Models for part number 421-9725

We currently do not have compatibility information for this part.

KeyKey
Factory Fit

This part is designed to fit your Cat equipment based on the manufacturer’s specifications.

Any changes to the manufacturer’s configuration might result in the product not fitting your Cat equipment. Please consult your Cat Dealer before purchasing to ensure that this part is appropriate for your Cat equipment in its current condition and assumed configuration. This indicator cannot guarantee compatibility for all parts.

Remanufactured

Non-Returnable

Kit

Replaced

Remanufactured

Non-Returnable

Kit

Replaced