Sierra Water Jacket Gasket 18-0133, Replaces 27-73665 and 27-52892, for 4 Cylinder Outboards

The Sierra Water Jacket Gasket, part number 18-0133, seals the water jacket cover on 4 cylinder outboard engines, forming the barrier between the cooling passages and the engine block to prevent coolant leaks and maintain proper cooling system pressure. Correct sealing at this joint is essential to preventing overheating and coolant loss, so this gasket is intended to be replaced any time the water jacket cover is removed for service rather than reused. It is manufactured to the dimensions and fit of the original equipment cover it mates to, measuring 0.39 x 0.39 x 0.39 inches and weighing 0.12 pounds, making it a compact, low-cost component that is easy to keep on hand as routine maintenance stock.

This gasket is sold individually (priced per piece). Buyers who need multiple units can order the package of 5 by requesting part number 18-0133-9 instead.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0133
• Product Type: Water Jacket Gasket
• Engine Fitment: 4 Cylinder
• Weight: 0.12 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• Packaging: Sold individually; package of 5 available as 18-0133-9
• OEM Cross Reference: 27-73665, 27-52892
• UPC: 030999754950

Fitment

• 4 Cylinder outboard engines

Replaces (OEM)

• 27-73665
• 27-52892

Frequently Asked Questions

What does the Sierra 18-0133 gasket fit? The 18-0133 water jacket gasket is designed for 4 cylinder outboard engines, sealing the water jacket cover against the engine block.

Is 18-0133 a direct replacement for OEM gaskets? Yes, part 18-0133 replaces OEM gaskets 27-73665 and 27-52892, so either original number can be used to confirm this is the correct part.

What are the dimensions of the 18-0133 water jacket gasket? This gasket measures 0.39 x 0.39 x 0.39 inches, a compact size consistent with a water jacket cover seal on a 4 cylinder outboard.

How much does the 18-0133 gasket weigh? The Sierra 18-0133 water jacket gasket weighs 0.12 pounds.

Can I buy the 18-0133 gasket in a multi-pack? The base part 18-0133 is sold individually (priced per piece); for a package of 5, order part number 18-0133-9 instead.

Should the water jacket gasket be reused after removing the cover? No, a water jacket gasket like the 18-0133 should be replaced with a new one any time the water jacket cover is removed, since a reused gasket is prone to leaking.

What happens if the water jacket gasket fails? A failed water jacket gasket, such as an old or damaged 18-0133, can allow coolant to leak from the water jacket cover joint, leading to reduced cooling efficiency or overheating.

Does Sierra 18-0133 cross-reference to more than one OEM number? Yes, 18-0133 corresponds to two OEM numbers, 27-73665 and 27-52892, both of which it replaces.

Is the 18-0133 gasket genuine Sierra or aftermarket equivalent? The 18-0133 is a Sierra brand part manufactured as a direct-fit replacement for the listed OEM numbers on 4 cylinder outboard engines.

What is included when I order part 18-0133? An order of 18-0133 includes one water jacket gasket; if the package quantity of 5 is needed, request part 18-0133-9 instead.