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HomeUpgrade & Repair KitsRepair & Service KitsEnginesGeneral Engine Repair & Service Kits421-9722: Top End Engine Overhaul Kit
HomeUpgrade & Repair KitsRepair & Service KitsEnginesGeneral Engine Repair & Service Kits421-9722: 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
421-8976: Oil Cooler and Lines Gasket Kit
421-8976: Oil Cooler and Lines Gasket KitQuantity: 1
6V-0237: Expansion Tank Install Gasket Kit
6V-0237: Expansion Tank Install 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
248-5513: Engine Water Temperature Regulator
248-5513: Engine Water Temperature RegulatorQuantity: 2
4L-8337: 81mm Inner Diameter O-Ring Seal
4L-8337: 81mm Inner Diameter O-Ring SealQuantity: 2
305-6843: 21.08mm Inner Diameter Lifter Guide Spring
305-6843: 21.08mm Inner Diameter Lifter Guide SpringQuantity: 24
419-8601: Single Cylinder Head Install Kit
419-8601: Single Cylinder Head Install KitQuantity: 2
4H-9541: 0.8mm Thick Exhaust Flange Gasket
4H-9541: 0.8mm Thick Exhaust Flange GasketQuantity: 1
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
219-6544: Aftercooler & Lines Install Gasket Kit
219-6544: Aftercooler & Lines Install Gasket KitQuantity: 1
421-1305: GASKET (F) KIT
421-1305: GASKET (F) KITQuantity: 1
516-5987: 3/8 - 16 Thread High-Temperature Taperlock Stud
516-5987: 3/8 - 16 Thread High-Temperature Taperlock StudQuantity: 4
3E-6916: 3/8''-16 Hex Nut
3E-6916: 3/8''-16 Hex NutQuantity: 4
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
106-1792: 100mm Long Taper Lock Steel Stud
106-1792: 100mm Long Taper Lock Steel StudQuantity: 24
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DescriptionSpecificationsCompatible Models
Description for part number 421-9722

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 421-9722

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

Compatible Models for part number 421-9722

MARINE ENGINE

3412

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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