Stainless Steel Skeg Guard – Fits MerCruiser Alpha 1 1985-1990 (Replaces 27021, 35-SS605)

Stainless Steel Skeg Guard – Fits MerCruiser Alpha 1 1985-1990 (Replaces 27021, 35-SS605)

This skeg repair guard is engineered for MerCruiser Alpha 1 stern drives manufactured from 1985 to 1990. Constructed from marine-grade 316 stainless steel, it offers a durable, bolt-on solution for protecting or repairing a damaged lower unit skeg. Its polished silver finish provides a clean, professional appearance while reinforcing the gearcase housing.

This component is a direct replacement for Megaware SkegGuard 27021, Panther 35-SS605, SupremeMarine 1907, QUICKMARINE 27021, and YCCOREE 27021.

• Installation Method: DIY-friendly bolt-on installation with included tools.
• Material: Polished, marine-grade 316 stainless steel for superior corrosion resistance.
• Design Feature: Includes a drain hole to prevent water stagnation and corrosion.

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 Mercury 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.

⚠ Note: For MerCruiser Alpha One Generation II (1991-Present), use part 27031 instead. For Pre Alpha 1 Drives (1973-1984), use part 27011.

Technical Specifications

Package Contents

• 1 x Skeg Guard (27021)
• 1 x Drill Bit
• 2 x Nuts
• 2 x Hex Wrenches
• 4 x Screws

Installation Guide

Installation is straightforward and typically takes less than 10 minutes. This guard can be installed even if you only have 2-3 inches of the original skeg remaining.

1. Step 1: Seat the skeg guard onto the lower unit's skeg, ensuring a snug fit.
2. Step 2: Use the included drill bit to drill holes through the skeg at the pre-drilled locations on the guard.
3. Step 3: Insert the self-drilling screws and tighten them securely with the provided hex wrenches and nuts.
4. Step 4: Check that the guard is firmly attached with no movement.

Troubleshooting & FAQ

How do I confirm this fits my engine?
This skeg guard is specifically designed for MerCruiser Alpha 1 stern drives from the years 1985–1990 only. For Alpha One Gen II (1991+), use 27031. For Pre Alpha 1 (1973-1984), use 27011. It directly replaces OEM part number 27021.

How much of my original skeg is needed for installation?
This repair guard can be successfully installed with as little as 2 to 3 inches of the original skeg remaining, making it an excellent solution for significant damage.

What is the benefit of the drain hole?
The built-in drain hole allows water to escape from inside the guard, preventing it from becoming trapped. This significantly reduces the risk of water stagnation, galvanic corrosion, and potential freeze-thaw damage in colder climates.

OEM vs. Aftermarket?
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.

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

What is your warranty and return policy?
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.