Sierra Exhaust Manifold Gasket 18-0956-1 for 3.7L 224 CID Chrysler Inboard Engines

The Sierra Exhaust Manifold Gasket, part number 18-0956-1, is a round replacement gasket engineered for 3.7L 224 CID 4-cylinder Chrysler inboard marine engines. This gasket seals the connection at the exhaust manifold, maintaining a tight seal against exhaust gases and coolant while the engine runs, which helps prevent leaks that can lead to overheating or exhaust intrusion into the bilge.

This gasket is used as part of the manifold gasket application for 170 HP and 180 HP 3.7L 224 CID engines built in 1985-1986 and 1987, and it is specified for engines fitted with either aluminum or cast iron exhaust manifolds, depending on the accompanying gasket set. It ships as a single gasket unit and is finished in white. Marine exhaust manifold gaskets like this one are a wear item that should be replaced any time the exhaust manifold is removed for service, since reusing an old gasket risks an improper seal and a repeat leak.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0956-1
• Product Type: Exhaust Manifold Gasket
• Shape: Round
• Color: White
• Quantity: 1 gasket
• Weight: 0.2 pounds
• UPC: 808282365813

Fitment

• Chrysler 3.7L 224 CID 4-cylinder inboard engines, 170 HP, 1985-1986, engines with aluminum exhaust manifolds, serial numbers 6916779 to B434940
• Chrysler 3.7L 224 CID 4-cylinder inboard engines, 170 HP, 1985-1986, engines with cast iron exhaust manifolds, serial numbers 6916779 to B434940
• Chrysler 3.7L 224 CID 4-cylinder inboard engines, 180 HP, 1987, engines with aluminum exhaust manifolds, serial numbers B436391 to B775248

Replaces (OEM)

• No OEM cross-reference numbers are listed for this gasket.

Frequently Asked Questions

What engines does the Sierra 18-0956-1 exhaust manifold gasket fit? This gasket fits Chrysler 3.7L 224 CID 4-cylinder inboard engines rated at 170 HP (1985-1986) and 180 HP (1987).

Does 18-0956-1 work with both aluminum and cast iron exhaust manifolds? Yes, depending on the specific engine build. On the 170 HP 1985-1986 engines, 18-0956-1 is used with either the aluminum manifold gasket set or the cast iron manifold gasket set, and it is also used on the 180 HP 1987 aluminum manifold application.

How do I know if my engine's serial number is covered? For the 170 HP 1985-1986 application, 18-0956-1 covers serial numbers 6916779 through B434940. For the 180 HP 1987 application, it covers serial numbers B436391 through B775248.

What color is the 18-0956-1 gasket? The Sierra 18-0956-1 exhaust manifold gasket is white and round in shape.

How many gaskets come in a package of 18-0956-1? Each package of the 18-0956-1 gasket contains one gasket unit.

How much does the 18-0956-1 exhaust manifold gasket weigh? The 18-0956-1 gasket weighs 0.2 pounds.

Is 18-0956-1 used alongside other gaskets in the same repair? Yes. For the 170 HP 1985-1986 aluminum manifold application, 18-0956-1 is used together with 18-1937 and 18-0881-1. For the cast iron manifold application on the same engine, it is used together with 18-0113-1.

Is this gasket genuine Sierra or aftermarket? The 18-0956-1 exhaust manifold gasket is a genuine Sierra part, identified by Sierra part number 18-0956-1.

When should I replace the exhaust manifold gasket? The 18-0956-1 gasket should be replaced any time the exhaust manifold is removed from a 3.7L 224 CID Chrysler inboard engine, since reinstalling a used gasket increases the risk of leaks.

Does 18-0956-1 have a UPC I can use to verify the part? Yes, the Sierra 18-0956-1 exhaust manifold gasket carries UPC 808282365813.