Sierra Head Gasket 18-3850 for Tohatsu Outboard Internal Engine

The Sierra 18-3850 Head Gasket is a replacement internal engine component designed for Tohatsu outboard engines. It seals the mating surface between the cylinder head and engine block, maintaining proper compression and preventing coolant or combustion leaks that can lead to overheating or power loss. As part of Sierra's internal engine parts line, this head gasket is built to restore a factory-correct seal during a head gasket replacement or full engine rebuild.

Each unit ships as a single head gasket (1 item per package), identified by Sierra part number 18-3850 and UPC 808282339449. It is intended for technicians and boat owners servicing Tohatsu outboard powerheads who need a properly fitted gasket rather than a generic cut sheet gasket, helping ensure an accurate seal against the cylinder head bolt pattern and coolant/combustion passages.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3850
• Item Type: Head Gasket
• Category: Tohatsu Outboard Internal Engine Parts
• Number of Items: 1
• Included Components: Head Gasket
• UPC: 808282339449
• Weight: 0.27 pounds

Fitment

• Tohatsu outboard engines

Frequently Asked Questions

What is the Sierra 18-3850 head gasket used for? It seals the joint between the cylinder head and engine block on a Tohatsu outboard engine, maintaining compression and preventing coolant or combustion leaks.

Does the 18-3850 head gasket fit Tohatsu outboards? Yes, the Sierra 18-3850 is categorized as a Tohatsu outboard internal engine part and is designed as a head gasket replacement for these engines.

How many gaskets are included with part number 18-3850? One head gasket is included per package of Sierra 18-3850.

What is the UPC for the Sierra 18-3850 head gasket? The UPC for this Sierra head gasket is 808282339449.

How much does the Sierra 18-3850 head gasket weigh? This head gasket weighs 0.27 pounds.

Is the Sierra 18-3850 an OEM or aftermarket gasket? Sierra 18-3850 is a Sierra-branded replacement head gasket manufactured for servicing Tohatsu outboard engines.

When would I need to replace this head gasket? A head gasket like the Sierra 18-3850 is typically replaced when a Tohatsu outboard shows signs of a blown gasket, such as compression loss, coolant leakage, or overheating, or during a full cylinder head or powerhead rebuild.

What part number should I order for this Tohatsu head gasket? Order Sierra part number 18-3850 for this Tohatsu outboard head gasket.

Is installation of the 18-3850 head gasket a DIY job? Installing a head gasket involves removing the cylinder head, so it is generally handled by someone comfortable with outboard engine teardown or a marine technician; the Sierra 18-3850 provides the correctly sized gasket for the job.

Does the Sierra 18-3850 come with any additional components? No, the package includes only the head gasket itself as the included component.