27-92720 Rear-Riser Closed-Cooling Manifold Gasket for MerCruiser I4

SERDAMARINE / MARINE EXHAUST PARTS

Exhaust Manifold-to-Elbow Gasket — Rear Riser, Closed Cooling

This aftermarket exhaust manifold-to-elbow or adaptor gasket (referenced to OEM 27-92720) seals the rear-riser joint on specified MerCruiser Inline 4 engines (Model 120/140 and 3.0L/3.0LX series) equipped with closed cooling. It is a single service gasket for the manifold-to-elbow or adaptor connection, not a complete manifold, elbow assembly, or multi-part kit.

Configuration & Specifications

Engine Applications

This gasket fits specified MerCruiser Stern / Out Drive Inline 4 applications configured with a rear riser and closed cooling. Do not select the gasket by engine model or year alone; verify your required service part number, joint type (manifold to elbow or adaptor), and closed-cooling setup before ordering.

• MerCruiser Stern / Out Drive — Rear Riser Exhaust Manifold to Elbow or Adaptor (1968–1982)
  Configuration: Rear riser, closed cooling; for exhaust manifold-to-elbow or manifold-to-adaptor joint. Fits when specified
• MerCruiser Stern / Out Drive — Model 140 (1968–1982)
  Engine: Inline 4, GM 181 CID, 4-cylinder. Configuration: Rear riser, closed cooling; exhaust manifold-to-elbow or adaptor joint. Fits when specified
• MerCruiser Stern / Out Drive — Model 120/140 (1982–1995)
  Engine: Inline 4, 153/181 CID, 4-cylinder. Configuration: Rear riser, closed cooling (verify closed-cooling manifold-to-elbow or adaptor requirement against your specific installation). Fits when specified
• MerCruiser Stern / Out Drive — Model 3.0LX/3.0L (1990 & Up)
  Engine: Inline 4, GM 181 CID, 4-cylinder. Configuration: Rear riser, closed cooling (verify closed-cooling manifold-to-elbow or adaptor requirement against your specific installation). Fits when specified

Reference Numbers

The numbers below are public references for part identification and cross-checking; they do not independently guarantee interchangeability across different cooling setups or indicate manufacturer identity.

Supplied Parts

• Exhaust manifold-to-elbow or adaptor gasket

Service & Installation Notes

General service guidance only. Use the service manual for your exact engine and exhaust configuration.

1. Ensure the engine is completely shut down and cool, and take precautions to prevent accidental starting before disassembling any exhaust components.
2. Support the exhaust elbow or adaptor during removal and installation to prevent strain or damage to mating surfaces.
3. Clean and inspect the mating flange surfaces of the exhaust manifold and the elbow or adaptor, ensuring old gasket material is removed without gouging the sealing faces.
4. Verify that this closed-cooling rear-riser gasket matches the passage layout required at your manifold-to-elbow or adaptor joint before final assembly.
5. After reassembly according to the engine manufacturer's manual, monitor the joint during initial operation; shut down immediately and inspect if any exhaust or fluid leaks or abnormal temperatures occur.

The Serdamarine Approach

Exhaust parts need a configuration match. Serdamarine focuses on marine exhaust manifolds and their related service parts. Application details, connection requirements and public reference numbers are presented together to support part selection.

Questions Before Replacement