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HomeUpgrade & Repair KitsRepair & Service KitsEnginesEngine Gasket Kits421-9726: KIT-ENGINE OVERHAUL (TOP END)
HomeUpgrade & Repair KitsRepair & Service KitsEnginesEngine Gasket Kits421-9726: KIT-ENGINE OVERHAUL (TOP END)
Parts included in this kit

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226-4753: 0.35mm Thick Metal Coated Gasket
226-4753: 0.35mm Thick Metal Coated GasketQuantity: 2
2P-3760: 0.8mm Two Bolt Flange Gasket
2P-3760: 0.8mm Two Bolt Flange GasketQuantity: 2
114-4427: 2.46 x 19.18mm 78A HNBR O-Ring
114-4427: 2.46 x 19.18mm 78A HNBR O-RingQuantity: 2
420-2031: GASKET (F) KIT
420-2031: GASKET (F) KITQuantity: 1
112-3540: 23.16mm Inside Diameter Seal-O-Ring
112-3540: 23.16mm Inside Diameter Seal-O-RingQuantity: 2
061-9456: SEAL-O-RING
061-9456: SEAL-O-RINGQuantity: 1
198-1517: 1.2mm Thick Cylinder Block Cover Gasket
198-1517: 1.2mm Thick Cylinder Block Cover 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
1R-0749: Secondary Fuel Filter
1R-0749: Secondary Fuel FilterQuantity: 2
5P-4268: SEAL-O-RING
5P-4268: SEAL-O-RINGQuantity: 1
176-8167: Aftercooler & Lines Install Gasket Kit
176-8167: Aftercooler & Lines Install Gasket KitQuantity: 1
420-4888: Single Cylinder Head Install Kit
420-4888: Single Cylinder Head Install KitQuantity: 2
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
5P-5846: 40.64mm Inside Diameter Seal-O-Ring
5P-5846: 40.64mm Inside Diameter Seal-O-RingQuantity: 1
5P-8068: 5.33 x 37.47mm 75A FKM O-Ring
5P-8068: 5.33 x 37.47mm 75A FKM O-RingQuantity: 4
420-4427: Heat Exchanger Install Gasket Kit
420-4427: Heat Exchanger Install Gasket KitQuantity: 1
305-6843: 21.08mm Inner Diameter Lifter Guide Spring
305-6843: 21.08mm Inner Diameter Lifter Guide SpringQuantity: 24
420-8545: Oil Cooler and Lines Gasket Kit
420-8545: Oil Cooler and Lines Gasket KitQuantity: 1
1R-1808: Engine Oil Filter
1R-1808: Engine Oil FilterQuantity: 2
113-5304: 5.33 x 50.17mm 75A FKM O-Ring
113-5304: 5.33 x 50.17mm 75A FKM O-RingQuantity: 3
3E-6773: 94.84mm Inside Diameter Seal-O-Ring
3E-6773: 94.84mm Inside Diameter Seal-O-RingQuantity: 2
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DescriptionSpecificationsCompatible Models
Description for part number 421-9726

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 421-9726

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

Compatible Models for part number 421-9726

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