U-Joint Oil Seal – Fits MerCruiser Bravo 1, 2, 3 Stern Drives (Replaces 26-807006, 26-18816)

U-Joint Oil Seal – Fits MerCruiser Bravo 1, 2, 3 Stern Drives (Replaces 26-807006, 26-18816)

This U-Joint Oil Seal is designed for a precise fit on MerCruiser Bravo I, II, III, X, XR, XZ, and Blackhawk stern drives manufactured from 1988 onwards (serial range 0B664190 and up).

It serves as a direct replacement for MerCruiser part numbers 26-807006 and 26-18816, as well as GLM 86730, ensuring compatibility and reliable performance.

• Includes one U-Joint Oil Seal for the drive shaft housing.
• Engineered for installation in the Universal Joint and Drive Shaft Housing.
• Constructed from a durable rubber and metal composite to withstand the marine environment.

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 Oil Seal (Replaces 26-807006, 26-18816)

Installation Guide

1. Drain the gear lube completely from the stern drive unit.
2. Carefully separate the upper and lower units of the stern drive to access the drive shaft.
3. Locate the old U-joint oil seal in the drive shaft housing.
4. Use a seal puller to carefully remove the old seal, taking care not to scratch the housing.
5. Thoroughly clean the seal mounting surface inside the housing to remove any old sealant or corrosion.
6. Apply a thin layer of marine grease to the outer edge of the new oil seal.
7. Position the new seal squarely over the housing opening.
8. Use a suitable driver or socket to gently and evenly press the new seal into place until it is fully seated.
9. Reassemble the stern drive units according to the manufacturer's specifications.
10. Refill the stern drive with the recommended gear lube to the correct level. Check for any leaks before operation.

Troubleshooting & FAQ

Q: How do I confirm this seal fits my MerCruiser drive?

A: This seal is compatible with MerCruiser Bravo I, II, and III series stern drives from 1988 and later (serial numbers 0B664190 and up), as well as Blackhawk drives from 1994-1995 (serial numbers 0F186717 and up). The most reliable method is to cross-reference your original part number with the replacements listed: 26-807006 and 26-18816.

Q: What are the signs that my U-joint oil seal is failing?

A: The most common sign of a failed seal is finding water in your gear lube, which will give it a milky or cloudy appearance. You might also notice gear oil leaking from the drive, particularly around the seam between the upper and lower units.

Q: How often should I replace this oil seal?

A: It is standard practice to replace the U-joint oil seal whenever you are servicing the U-joints or separating the drive halves for other maintenance. Proactive replacement during these services can prevent future leaks and costly repairs.

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.