Gasket – code: 27-8172771 – Mercury

Mercury gasket code 27-8172771

The Mercury gasket code 27-8172771 is a spare part designed for maintenance and sealing restoration in the nautical field. It is a gasket intended for installation on the plate (wear plate), at the water pump assembly, where it is essential to maintain a proper fit between the surfaces to avoid leaks and losses.

Spare part features and details

Product identification

• Product: Gasket
• Code: 27-8172771
• Brand / reference: Mercury
• Supplier product code: MC27-8172771

Positioning and function

The gasket is intended to be installed between the water pump body and the wear plate. In this position it helps to:

• promote a ensure proper sealing between the mating surfaces;
• reduce the risk of leaks in the pump assembly;
• support the maintenance of correct water circulation in the cooling circuit.

Materials

The spare part is described as made with materials resistant to the marine environment (water, oils, and typical operating temperatures).

Applications

Based on the available information, gasket 27-8172771 is indicated for applications on:

• Alpha One Gen II (series indicated in existing content);
• Mercury / MerCruiser outboard engines (as reported in existing content).

Notes on compatibility and references

Compatibility is mentioned with Alpha One Gen II for serial numbers above 0D436859 (and similar versions). Since compatibility may vary depending on model, year, and configuration, it is recommended to:

• check the code 27-8172771 on the Mercury/Mariner spare parts catalog or on your pump assembly parts list;
• compare the removed spare part (shape and positioning) before installation;
• in case of doubts, contact support providing model and serial number of the engine/leg.

Equivalent references (aftermarket)

Existing content indicates that this code can replace some aftermarket references, including:

• Sierra 18-2566
• GLM 30290
• Mallory 9-60023

Note: equivalent references are useful for comparison, but it is always advisable to order and install based on the original code and the actual configuration of the pump assembly.

Benefits for maintenance and restoration

A correctly sized and installed gasket is a simple but crucial element in water pump maintenance. In particular, this spare part is recommended for those who want to:

• perform a routine maintenance of the water pump assembly;
• restore the estate between pump body and wear plate;
• reduce the risk of issues related to leaks or incorrect fittings;
• keep the system in conditions consistent with the assembly intended by the manufacturer.

Usage and installation notes

Replacing the gasket is typically part of a water pump assembly service. For a neat and reliable result, it is good practice to:

• thoroughly clean the contact surfaces (pump body and wear plate) removing residues of the old gasket;
• check that there are no obvious signs of wear or scratches on the support surfaces;
• correctly position the gasket, avoiding folds or misalignments;
• tighten the components according to the instructions in the workshop manual of the specific model.

If you are purchasing the spare part for a scheduled intervention, also evaluate the general condition of the pump group components (for example impeller and wear plate) based on the manufacturer's indications and usage conditions.

Order support

To speed up the check before purchase, you can refer to:

• Mercury Code: 27-8172771
• Supplier code: MC27-8172771

In case of assistance request, also indicate the usage category (foot/engine) and, if available, the unit's serial number.

FAQ – Frequently Asked Questions

Where is the Mercury 27-8172771 gasket installed?

It is intended for installation between the water pump body and the wear plate (gasket above the plate), as reported in the product information.

For which applications is this gasket suitable?

The available content reports the application on Alpha One Gen II and Mercury / MerCruiser outboard engines. Compatibility may vary: it is advisable to check with model and serial number.

Does this gasket replace aftermarket codes?

Yes, in the existing content it is indicated as a replacement for Sierra 18-2566, GLM 30290, and Mallory 9-60023. It is still preferable to always confirm through the original code and spare parts catalog.

Is it suitable for routine water pump maintenance?

Yes, it is indicated as the ideal replacement for routine maintenance interventions of the water pump group, when disassembling and restoring the seal between components.

What data should I provide to verify compatibility before purchase?

For an accurate check, it is useful to provide code 27-8172771, the unit model, and the engine/foot serial number (if available), as well as any references of the removed spare part.