Exhaust Manifold Gasket – Fits MerCruiser, Volvo Penta, OMC 3.0L Engines (Replaces 27-815528, 3853256)

Exhaust Manifold Gasket – Fits MerCruiser, Volvo Penta, OMC 3.0L Engines (Replaces 27-815528, 3853256)

This exhaust manifold gasket is designed for a precise fit on a range of 4-cylinder 3.0L engines from MerCruiser, Volvo Penta, and OMC. It is engineered to meet or exceed original equipment specifications, ensuring a reliable seal and durable performance for your marine engine's exhaust system.

This part directly replaces MerCruiser part number 27-815528, Volvo Penta part number 3853256, and OMC part number 3853256. It also serves as an aftermarket replacement for Sierra 18-0680, GLM 33580, and FEL-PRO 17304.

• Installation: Direct replacement component.
• Material: Produced in an ISO9002-certified facility using OEM-grade materials.
• Compatibility: Fits gasoline-powered 3.0L 4-cylinder engines as detailed below.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

For MerCruiser owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Exhaust Manifold Gasket (Replaces OEM Part Numbers 27-815528, 3853256)

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is cool before starting.
2. Drain Coolant: Drain the engine coolant from the manifold to prevent spills.
3. Remove Manifold: Carefully detach hoses, sensors, and wiring connected to the exhaust manifold. Unbolt and remove the manifold from the engine block.
4. Clean Surfaces: Thoroughly clean both the cylinder head and the manifold mating surfaces. Remove all traces of the old gasket and any sealant residue.
5. Position Gasket: Place the new gasket correctly over the dowel pins or alignment holes on the cylinder head. Ensure it is not installed backward or upside down.
6. Reinstall Manifold: Carefully place the exhaust manifold back onto the engine, aligning it with the gasket.
7. Torque Bolts: Tighten the manifold bolts in the sequence and to the torque specifications recommended by the manufacturer.
8. Final Checks: Reconnect all hoses, sensors, and wiring. Refill the coolant, start the engine, and carefully check for any exhaust or fluid leaks around the gasket.

Troubleshooting & FAQ

Q: How do I confirm this gasket fits my specific engine?

A: The most reliable method is to match your existing part number to one of the numbers listed in our Part Number Cross-Reference table. You can also use our Compatible Engine Models table to verify your model and year range falls within the specified list.

Q: What are the common signs of a failing exhaust manifold gasket?

A: Common symptoms include a noticeable exhaust leak (ticking or hissing sound) from the engine bay, water leaking externally from the manifold joint, engine overheating, or a loss of engine performance.

Q: Is this a single gasket or a set for both sides?

A: As stated in the "Package Contents," this product includes one single exhaust manifold gasket.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.