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HomeUpgrade & Repair KitsRepair & Service KitsEnginesGeneral Engine Repair & Service Kits421-9728: Top End Engine Overhaul Kit
HomeUpgrade & Repair KitsRepair & Service KitsEnginesGeneral Engine Repair & Service Kits421-9728: Top End Engine Overhaul Kit
Parts included in this kit

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245-8342: 0.8mm Thick Square Gasket
245-8342: 0.8mm Thick Square GasketQuantity: 1
420-4426: Fuel Systemtem Gasket Kit
420-4426: Fuel Systemtem Gasket KitQuantity: 1
420-8612: Oil Cooler and Lines Gasket Kit
420-8612: Oil Cooler and Lines Gasket KitQuantity: 1
8F-4994: 23.16mm Inside Diameter Seal-O-Ring
8F-4994: 23.16mm Inside Diameter Seal-O-RingQuantity: 1
1R-0749: Secondary Fuel Filter
1R-0749: Secondary Fuel FilterQuantity: 2
4L-8337: 81mm Inner Diameter O-Ring Seal
4L-8337: 81mm Inner Diameter O-Ring SealQuantity: 2
248-5513: Engine Water Temperature Regulator
248-5513: Engine Water Temperature RegulatorQuantity: 2
6V-0237: Expansion Tank Install Gasket Kit
6V-0237: Expansion Tank Install Gasket KitQuantity: 1
3E-6916: 3/8''-16 Hex Nut
3E-6916: 3/8''-16 Hex NutQuantity: 4
219-6544: Aftercooler & Lines Install Gasket Kit
219-6544: Aftercooler & Lines Install Gasket KitQuantity: 1
106-1792: 100mm Long Taper Lock Steel Stud
106-1792: 100mm Long Taper Lock Steel StudQuantity: 24
2N-2766: 3/8''-16 Cone Lock Nut
2N-2766: 3/8''-16 Cone Lock NutQuantity: 24
3D-2824: 2.95 x 23.47mm 90A NBR O-Ring
3D-2824: 2.95 x 23.47mm 90A NBR O-RingQuantity: 1
420-4961: Single Cylinder Head Install Kit
420-4961: Single Cylinder Head Install KitQuantity: 2
305-6843: 21.08mm Inner Diameter Lifter Guide Spring
305-6843: 21.08mm Inner Diameter Lifter Guide SpringQuantity: 24
1R-1808: Engine Oil Filter
1R-1808: Engine Oil FilterQuantity: 2
5S-1188: 88.26mm Inside Diameter Seal-O-Ring
5S-1188: 88.26mm Inside Diameter Seal-O-RingQuantity: 2
4H-9541: 0.8mm Thick Exhaust Flange Gasket
4H-9541: 0.8mm Thick Exhaust Flange GasketQuantity: 1
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DescriptionSpecificationsCompatible Models
Description for part number 421-9728

Containing all the basics for your best top end overhaul, our Foundational Level Kit is designed for convenience - prepackaged, ordered with a single part number and delivered in a single box. Includes all gaskets and seals required for a complete top end overhaul and many 100% replacement items, ranging from thermostats to gear bushings.

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Warning:This product can expose you to chemicals including Lead and lead compounds, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Specifications for part number 421-9728

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

Compatible Models for part number 421-9728

MARINE ENGINE

3412E

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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