Aftermarket Intake Manifold Reed Block Gasket for Mercury 200 HP 3.0L EFI/DFI and 200 Pro XS DFI – Replaces 27-804680

Product Details

This aftermarket intake manifold reed block gasket is a replacement sealing component for selected Mercury 200 HP 3.0L EFI and DFI outboard engines, including documented 200 Pro XS DFI applications. It is installed at the gasket interface within the air-handler or fuel-management assembly and is intended to help restore a proper seal during reassembly.

Catalog records identify this gasket under Mercury OEM reference 27-804680. The reference is shown in Mercury parts catalog occurrences for specific engine serial-number ranges listed below. Always compare the engine model and serial number with your service information before ordering.

• Replacement gasket for the intake manifold and reed-block assembly
• Documented for selected Mercury 200 HP 3.0L EFI and DFI applications
• Includes one gasket; this is a single replacement component, not a multi-part kit
• Aftermarket replacement, not a Mercury-branded OEM part

Part Number Information

Use the following verified reference when comparing the replacement gasket with the original part.

Documented Engine Compatibility

The applications below are supported by catalog occurrences for reference 27-804680. Because fitment depends on engine configuration and serial number, do not use horsepower alone to confirm compatibility.

Applications for Mercury 225 HP, 250 HP, 300 HP, Mariner engines, 3.2L engines, Optimax engines, or other serial ranges were not confirmed by the available exact-reference catalog records. Verify the complete model designation and serial number before purchase.

Technical Specifications

Part Type

Intake manifold reed block gasket

Component Type

Single replacement gasket

Documented Application

Selected Mercury 200 HP 3.0L EFI and DFI outboard engines, including 200 Pro XS DFI

Engine Configuration

6-cylinder applications are indicated by the associated catalog listings

Primary OEM Reference

27-804680

Brand Status

Aftermarket replacement; not an OEM component

What's in the Box

• 1 × Intake manifold reed block gasket

Installation Notes

1. Disconnect the battery and follow the applicable Mercury service-manual safety procedures before beginning work.
2. Relieve fuel-system pressure where required by the engine service procedure.
3. Remove the necessary air-handler or intake-manifold components to access the existing gasket.
4. Clean the mating surfaces thoroughly and remove all old gasket material without damaging the sealing surfaces.
5. Inspect the reed block and mating components for cracks, distortion, corrosion, or other damage.
6. Position the new gasket correctly and align all locating features and fastener holes.
7. Reassemble the components and tighten fasteners in the sequence and to the torque specified in the applicable Mercury service manual.
8. Reconnect all fuel, air, and electrical connections, then inspect for leaks or air leakage before returning the engine to service.

Troubleshooting & FAQ

What does this gasket seal?

This gasket seals the mating interface within the intake-manifold, reed-block, air-handler, or fuel-management assembly identified by the applicable engine parts catalog.

How do I know if the gasket needs replacement?

Replacement may be required when the existing gasket is damaged, compressed, torn, contaminated, or disturbed during component removal. Air leakage, fuel leakage, rough running, or loss of performance can have several causes, so diagnose the engine before replacing parts.

Can I reuse the old gasket?

Use a new gasket whenever the service procedure requires removal of the sealed components. Do not reuse a gasket that is torn, permanently compressed, contaminated, or otherwise damaged.

Is this confirmed for every Mercury 200 HP engine?

No. The documented fitment is limited to the Mercury 200 HP configurations and serial-number ranges shown in the compatibility table. Confirm the complete model and serial number before ordering.

Is this confirmed for Mercury 225 HP, 250 HP, or 300 HP engines?

Those applications were not confirmed by the available exact-reference catalog records for this listing. Do not rely on horsepower alone; compare the original gasket and verify the engine serial number with a Mercury parts diagram or service manual.

Is this an OEM Mercury gasket?

No. This listing is for an aftermarket replacement gasket. The Mercury reference 27-804680 is provided for identification and fitment comparison.

What torque specification should I use?

Use the exact fastener torque and tightening sequence specified in the service manual for your engine model and serial-number range. Do not substitute a generic torque value.

Safety & Important Information

• Confirm the complete engine model, configuration, and serial number before ordering.
• Compare the replacement gasket with the original part and the applicable parts diagram.
• Do not assume compatibility with unlisted horsepower ratings, displacements, fuel systems, or brands.
• This is an aftermarket replacement component, not a Mercury-branded OEM part.
• Professional installation is recommended when working on fuel-management or intake components.

About Sea Sierra

• We supply aftermarket marine replacement parts for service and repair applications.
• Each listing is organized around available part-reference and application information.
• For the best fitment result, provide the complete engine model and serial number when checking a replacement part.