Sierra 18-3836 Head Gasket for Johnson/Evinrude 65 HP Commercial Outboards, 1987-95

The Sierra 18-3836 head gasket is a replacement power head gasket engineered for Johnson and Evinrude outboard applications, specifically the 65 HP Commercial model built 1987-95. This gasket forms the critical seal between the cylinder block and cylinder head, preventing compression loss and coolant or combustion leaks that can lead to overheating or power head failure. It is manufactured from glass gasket material with a white finish, chosen for its ability to withstand the repeated heat cycling and vibration of marine two-stroke outboard operation while maintaining a durable, long-lasting seal.

Each package includes one gasket, sized and shaped specifically for the 65 HP Commercial power head, so no trimming or modification is required during installation. Sierra engineers this gasket to meet or exceed the performance of the original equipment part it replaces, making it a reliable choice when rebuilding or servicing the power head. It is designed as a direct fit for the listed application and is cross-referenced to common OEM and aftermarket part numbers for easy identification when ordering.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3836
• Material: Glass
• Color: White
• Shape: Round
• Weight: 0.17 pounds
• Package Quantity: 1 gasket per package
• UPC: 030999316875

Fitment

• Johnson/Evinrude 65 HP Commercial outboards, 1987-95

Replaces (OEM)

• GLM 34280
• Johnson/Evinrude Outboard 329836
• Mallory 9-63821

Frequently Asked Questions

What outboards does the Sierra 18-3836 head gasket fit? The 18-3836 is designed for Johnson/Evinrude 65 HP Commercial outboards built 1987-95.

Is the 18-3836 an OEM head gasket or an aftermarket replacement? It is a Sierra aftermarket head gasket engineered to meet or exceed the performance of the original equipment part it replaces on the 65 HP Commercial Johnson/Evinrude power head.

What OEM part numbers does the 18-3836 cross-reference? This gasket is interchangeable with GLM 34280, Johnson/Evinrude Outboard 329836, and Mallory 9-63821.

How many gaskets come in one package? Each package of the 18-3836 contains one head gasket.

What material is the 18-3836 head gasket made from? It is made from glass gasket material with a white finish, chosen for durability under the heat and vibration of outboard operation.

What shape is the Sierra 18-3836 gasket? The 18-3836 is a round head gasket sized specifically for the 65 HP Commercial Johnson/Evinrude power head.

How much does the 18-3836 head gasket weigh? The 18-3836 weighs 0.17 pounds.

Do I need to modify or trim the 18-3836 before installing it? No, the 18-3836 is sized to fit the 65 HP Commercial power head directly, so no trimming or modification is needed.

Will the 18-3836 fit a 65 Jet model Johnson/Evinrude outboard? No, the 18-3836 is specified for the 65 HP Commercial application; the 65 Jet application uses a different Sierra part number, so confirm your engine model before ordering.

What does this gasket seal? The 18-3836 seals the joint between the cylinder block and cylinder head on the power head, preventing compression, coolant, or combustion leaks.

What is the UPC for the Sierra 18-3836? The UPC for the Sierra 18-3836 head gasket is 030999316875.