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

This aftermarket exhaust manifold gasket is engineered to meet or exceed OEM specifications, ensuring a reliable seal for your marine engine. It is designed for a precise fit on a wide range of 4-cylinder, 3.0L engines from MerCruiser, Volvo Penta, and OMC, covering models from 1990 to the present day.

This single gasket serves as a direct replacement for multiple OEM part numbers, simplifying part selection. It is a crucial component for preventing exhaust and coolant leaks, restoring engine performance and efficiency.

• Installation Type: Direct replacement
• Compatible Fuel Type: Gasoline
• Included Components: One exhaust manifold gasket

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.

MerCruiser

Volvo Penta

OMC

Technical Specifications

Package Contents

• 1 x Exhaust Manifold Gasket (Replaces 27-815528 / 3853256)

Installation Guide

1. Safety First: Ensure the engine is completely cool and disconnect the boat's battery.
2. Drain Coolant: Drain the engine's cooling system to a level below the exhaust manifold to prevent spills.
3. Disconnect Components: Carefully detach any wires, sensors, or hoses connected to the exhaust manifold.
4. Remove Manifold: Loosen and remove the mounting bolts securing the exhaust manifold to the cylinder head. Carefully remove the manifold and the old gasket.
5. Clean Surfaces: Thoroughly clean the mating surfaces on both the cylinder head and the manifold. Remove all traces of old gasket material, rust, and debris for a perfect seal.
6. Position Gasket: Place the new gasket into position, ensuring it aligns correctly with the ports and bolt holes.
7. Reinstall Manifold: Re-position the exhaust manifold and hand-tighten the bolts. Following the manufacturer's service manual, tighten the bolts to the specified torque in the correct sequence.
8. Reconnect Components: Reattach all previously disconnected hoses, sensors, and wires.
9. Final Checks: Refill the cooling system, reconnect the battery, and start the engine. Carefully check for any exhaust or coolant leaks around the manifold.

Troubleshooting & FAQ

Q: How do I confirm this gasket fits my 3.0L engine?

A: This gasket fits a wide range of MerCruiser, Volvo Penta, and OMC 3.0L engines. The most reliable way to confirm fitment is to check your engine's model and year against the "Compatible Engine Models" tables on this page. Cross-referencing your old part number with the OEM numbers (27-815528 for MerCruiser or 3853256 for Volvo/OMC) is the best way to guarantee a match.

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

A: Common symptoms include a loud ticking or tapping noise from the engine bay that may decrease as the engine warms up, a strong exhaust smell, decreased engine performance or fuel efficiency, and visible soot trails or coolant leaks around the manifold-to-head connection.

Q: How often should I replace my exhaust manifold gasket?

A: The gasket does not have a set replacement interval. It must be replaced any time the exhaust manifold is unbolted from the engine for service or repair. Always use a new gasket to ensure a proper, leak-free seal upon reassembly.

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.