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HomeUpgrade & Repair KitsRepair & Service KitsEnginesEngine Gasket Kits421-9727: Engine Overhaul (Top End) Kit
HomeUpgrade & Repair KitsRepair & Service KitsEnginesEngine Gasket Kits421-9727: Engine Overhaul (Top End) Kit
Parts included in this kit

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421-8976: Oil Cooler and Lines Gasket Kit
421-8976: Oil Cooler and Lines Gasket KitQuantity: 1
556-8659: Single Cylinder Head Install Gasket Kit
556-8659: Single Cylinder Head Install Gasket KitQuantity: 2
6V-0237: Expansion Tank Install Gasket Kit
6V-0237: Expansion Tank Install Gasket KitQuantity: 1
112-3540: 23.16mm Inside Diameter Seal-O-Ring
112-3540: 23.16mm Inside Diameter Seal-O-RingQuantity: 2
114-4427: 2.46 x 19.18mm 78A HNBR O-Ring
114-4427: 2.46 x 19.18mm 78A HNBR O-RingQuantity: 2
226-4753: 0.35mm Thick Metal Coated Gasket
226-4753: 0.35mm Thick Metal Coated GasketQuantity: 2
1R-0749: Secondary Fuel Filter
1R-0749: Secondary Fuel FilterQuantity: 2
248-5513: Engine Water Temperature Regulator
248-5513: Engine Water Temperature RegulatorQuantity: 2
6V-5063: 2.95 x 23.47mm 70A EPDM O-Ring
6V-5063: 2.95 x 23.47mm 70A EPDM O-RingQuantity: 1
421-1305: GASKET (F) KIT
421-1305: GASKET (F) KITQuantity: 1
124-1858: 3.53 x 53.57mm 75A FKM O-Ring
124-1858: 3.53 x 53.57mm 75A FKM O-RingQuantity: 1
114-2687: 5.33 x 23.16mm 78A HNBR O-Ring
114-2687: 5.33 x 23.16mm 78A HNBR O-RingQuantity: 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
3E-6916: 3/8''-16 Hex Nut
3E-6916: 3/8''-16 Hex NutQuantity: 8
420-0923: Aftercooler & Lines Install Kit
420-0923: Aftercooler & Lines Install KitQuantity: 1
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
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 421-9727

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 421-9727

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

Compatible Models for part number 421-9727

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