Sierra Head Gasket 18-3857, Replaces 27-824615, for Chrysler/Force 100-140 HP Outboards, Pack of 2

The Sierra 18-3857 Head Gasket is a direct-fit replacement gasket engineered for Chrysler/Force outboard engines rated 100 thru 140 H.P. It is designed to restore a proper combustion seal between the cylinder head and engine block, preventing compression loss, coolant intrusion, and exhaust gas leakage that can result from a worn or failed factory gasket. Sierra builds this gasket to meet or exceed the specification of the original equipment part it replaces, using materials suited to withstand the heat cycling, pressure, and harsh marine environment outboard engines operate in. Each gasket is finished in white and sold as a package of 2, giving the installer the correct quantity on hand for a complete head gasket job without ordering twice. This part is intended for outboard engine rebuilds, head removal service, and repairs where the head gasket is being replaced as a matter of course due to age, overheating, or a failed seal. Because it carries the same cross-reference numbers as several original Chrysler/Force part numbers, it is a straightforward swap for technicians and DIY boaters working from OEM parts diagrams or service manuals that list those numbers.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3857
• Product Type: Head Gasket
• Color: White
• Package Quantity: Pack of 2
• Weight: 0.3 pounds
• Application: Outboard - Chrysler/Force
• Horsepower Range: 100 thru 140 H.P.

Fitment

• Chrysler/Force outboard engines, 100 thru 140 H.P.

Replaces (OEM)

• 27-824615
• 27-824615-2
• F476529
• F476529-1
• F476529-2
• 27-F476529-4

Frequently Asked Questions

What engines is the Sierra 18-3857 head gasket designed for? The 18-3857 head gasket is built for Chrysler/Force outboard engines rated 100 thru 140 H.P.

How many gaskets come in a package? The 18-3857 is sold as a package of 2 head gaskets, enough for a single head gasket replacement job on most applications it covers.

What OEM part numbers does this gasket replace? It replaces OEM numbers 27-824615, 27-824615-2, F476529, F476529-1, F476529-2, and 27-F476529-4.

Is this a genuine OEM gasket or an aftermarket part? The 18-3857 is a Sierra-manufactured aftermarket gasket built to meet or exceed the original equipment part it replaces, not a Chrysler/Force branded OEM gasket.

What color is the 18-3857 head gasket? This head gasket is finished in white.

How much does the 18-3857 head gasket weigh? The Sierra 18-3857 head gasket weighs 0.3 pounds per package.

Will this gasket fit a Force 125 HP outboard? Yes, the 18-3857 head gasket is designed for the 100 thru 140 H.P. Range of Chrysler/Force outboards, which covers a 125 HP application.

Does the 18-3857 come with installation hardware or bolts? The 18-3857 package includes 2 head gaskets only; no bolts or additional hardware are included.

Why would I need to replace the head gasket on my Chrysler/Force outboard? A head gasket like the 18-3857 typically needs replacement after overheating, a compression loss, coolant leakage, or any time the cylinder head is removed for service.

Can I order just one 18-3857 gasket instead of the pack of 2? The 18-3857 is sold only as a package of 2 gaskets, matching how it is packaged for Chrysler/Force 100 thru 140 H.P. Outboard applications.