Magnetic Drain Screw Kit – Fits Mercury Marine Outboard & MerCruiser Stern Drives (Replaces 22-8M0058389, 22-67892)

Magnetic Drain Screw Kit – Fits Mercury Marine Outboard & MerCruiser Stern Drives

This magnetic drain screw kit is designed for use with Mercury Marine outboards (excluding Verado series) and MerCruiser stern drives that feature a 3/8-16 drain and fill hole. It is also compatible with select Krysler/Force models using the same 3/8-16 thread size.

This kit serves as a direct replacement for Mercury/MerCruiser part numbers 22-8M0058389, 10-14834, 10-14834A1, 22-67892, 22-67892A05, 22-67892A06, and 22-67892A1. It also cross-references with Sierra 18-2375, GLM 21731, and Mallory 9-72651.

• Includes two magnetic drain screws and six drain screw gaskets.
• Features a magnetic tip to capture metallic debris within the gear case, aiding in early detection of potential gear wear.
• Constructed from durable stainless steel for corrosion resistance.

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.

Mercury/MerCruiser

Krysler/Force

Technical Specifications

Package Contents

• 2 x Magnetic Drain Screws (Replaces 22-8M0058389 / Sierra 18-2375)
• 6 x Drain Screw Gaskets (Replaces 26-830749 / Sierra 18-2430-9)

Installation Guide

1. Position a suitable drain pan under the gear case drain plug.
2. Using a large flathead screwdriver, remove the lower (drain) screw, followed by the upper (vent) screw.
3. Allow the gear lube to drain completely. Inspect the old lube for excessive metal shavings or a milky appearance, which may indicate water intrusion.
4. Inspect the magnetic tip of the old drain screw for any large metal chunks, which could signify gear damage.
5. Clean the threads around the drain and vent holes on the gear case.
6. Place a new gasket on the new magnetic drain screw and install it into the lower drain hole. Tighten it securely, but do not overtighten.
7. Fill the gear case with the manufacturer-recommended gear lube through the upper vent hole until lube begins to flow out.
8. Install the new gasket and second drain screw into the upper vent hole and tighten securely.
9. Clean any excess lube from the gear case and check for leaks after a short period.

Troubleshooting & FAQ

Q: How do I confirm this screw kit will fit my engine's lower unit?
A: The most reliable method is to check your OEM part number. This kit fits lower units requiring a 3/8"-16 UNC thread size and replaces Mercury part number 22-8M0058389 and others listed in the cross-reference table. You should also verify compatibility with your model and year in the tables above.

Q: What is the purpose of the magnet on the drain screw?
A: The magnetic tip attracts and captures fine metallic particles that circulate in your gear lube. During an oil change, inspecting the magnet allows you to monitor the health of your internal gears and bearings. A small amount of fine "fuzz" is normal, but larger chips can indicate a problem.

Q: How often should I replace the drain screw gaskets?
A: You must use a new gasket every time you remove and reinstall the drain screws. Reusing old gaskets can lead to improper sealing, causing gear lube leaks or, worse, water intrusion into the lower unit.

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, especially the 3/8"-16 thread size, 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. Part numbers are for reference purposes only.
• Professional installation is recommended to ensure safety and optimal performance. Improper installation can lead to leaks and gear case damage.

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.