Stainless Steel Skeg Guard for Mercury MerCruiser Alpha One 1985-1990

Stainless Steel Skeg Guard for Mercury MerCruiser Alpha One 1985-1990

This marine-grade stainless steel skeg guard is designed to protect the outdrives on Mercury MerCruiser Alpha One Gen 1 models manufactured between 1985 and 1990. It serves as a reliable solution for covering a damaged or broken skeg, preventing further damage while restoring performance and appearance.

This aftermarket component directly replaces MerCruiser 27021, GlückMarine 27021, sevencow 27021-TP1, and VT-MOTOR 27021.

• Installation Method: Simple bolt-on design requires no welding.
• Material Construction: Made from durable, mirror-polished 316 stainless steel for superior corrosion resistance.
• Protective Design: Includes a drain hole to prevent water from collecting and causing corrosion or damage from freezing.

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.

Technical Specifications

Package Contents

• 1 x Skeg Guard (27021)
• 2 x Hex Wrench
• 2 x Female Locking Screws
• 2 x Big Male Locking Screws
• 2 x Small Male Locking Screws
• 1 x Loctite 262 (if purchased from certain retailers)

Installation Guide

1. Clean the exterior of your existing skeg, removing any marine growth or debris. Ensure the engine is off and the drive is tilted up for safe access.
2. Confirm you have at least 2-3 inches (50-76 mm) of your original skeg remaining for the guard to properly mount.
3. Slide the skeg guard over the damaged skeg to test the fit. The guard should fit snugly.
4. Insert the female locking screws into the skeg guard.
5. Apply the included Loctite threadlocker to the male mounting screws to prevent them from loosening due to vibration.
6. Align the mounting holes and insert the appropriate male locking screws. Tighten them evenly using the provided hex wrenches until the guard is securely fastened. Do not overtighten.
7. Check for any gaps or movement. Once secure, the installation is complete.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: This skeg guard is designed specifically for Mercury and MerCruiser Alpha One Gen 1 sterndrives from 1985-1990. Please verify your drive model and year by checking the compatibility table above. It replaces OEM part number 27021.

Q: How much of my original skeg needs to be left for this guard to install correctly?
A: You must have a minimum of 2 to 3 inches (50-76 mm) of the original skeg remaining. This is required to provide a solid mounting base for the bolt-on installation.

Q: What is the purpose of the drain hole at the bottom?
A: The drain hole is a key design feature that prevents water from collecting inside the guard. This helps prevent corrosion, galvanic action, and potential damage from water freezing and expanding in colder climates.

Q: Is drilling or welding required for installation?
A: No. This is a bolt-on part that does not require any drilling or welding. The kit includes all necessary mounting hardware and can be installed in approximately 10 minutes.

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.