27-815528 Exhaust Manifold Gasket for MerCruiser 120/140 3.0L 3.0LX

SERDAMARINE / MARINE EXHAUST PARTS

Exhaust Manifold Gasket for 4-Cylinder Marine Engines (Ref. 27-815528)

This aftermarket exhaust manifold gasket is for specified MerCruiser, Volvo Penta, and OMC 4-cylinder applications, including MerCruiser 120/140 (1982–1995), 3.0L, 3.0LX (1990–1997), and 3.0L MPI models. It corresponds to the 27-815528 / 3853256 gasket pattern rather than the separate old-style MerCruiser 27-96429 pattern, and does not include exhaust elbow or carburetor gaskets.

Engine Applications

Select this gasket by comparing your original manifold gasket reference, exact engine model suffix (such as LX, MPI, H.O., or GS), and production year rather than relying on “3.0L” or “4-cylinder” alone.

• MerCruiser Model 120 / 140 — Inline 4, 153 / 181 CID, 4-cylinder, 1982–1995. For older 120 and 140 engines, verify whether the manifold requires the 27-815528 gasket pattern or the separate old-style 27-96429 / GLM 33570 pattern. Fits when specified
• MerCruiser Model 3.0LX / 3.0L — Inline 4, GM 181 CID, 4-cylinder, 1990 & up. Fits as listed
• MerCruiser MCM 3.0LX — 4-cylinder, 1990–1997. Fits as listed
• MerCruiser 3.0L — 4-cylinder, after 1995 (including MCM 3.0L 1998 & newer). Fits as listed
• MerCruiser 3.0L MPI — 4-cylinder. Fits as listed
• Chevy 4-Cyl. — Marine applications matching the 27-815528 / 3853256 exhaust manifold gasket reference. Fits when specified
• Volvo Penta / OMC Cobra Stern Drive — 4-cylinder marine engines using exhaust manifold gasket part numbers 3853256, 914518, 914578, or 0914578. Fits when specified

Reference Numbers

The numbers below are provided for part identification and cross-reference only; they do not imply OEM manufacturer identity or universal interchangeability across different manifold versions.

Supplied Parts

• Exhaust manifold gasket

This listing is for the standalone exhaust manifold gasket, not a complete manifold assembly or multi-component repair kit. Exhaust elbow and carburetor gaskets are separate items.

Service & Installation Notes

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

1. Allow the engine and exhaust system to cool completely and secure the ignition against accidental starting before beginning work.
2. Support the exhaust manifold while removing fasteners, then clean and inspect the cylinder head and manifold mating surfaces to protect the sealing area from burrs or old gasket material.
3. Compare the new gasket directly against the manifold ports, bolt holes, and your engine's required part reference (27-815528 vs. 27-96429) before installation.
4. Follow your engine manufacturer's service manual for fastener tightening sequence and torque specifications; if any exhaust leak or abnormal temperature occurs during operation, stop the engine immediately and inspect.

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