26-807006 U Joint Yoke Oil Seal for Mercruiser Bravo I Bravo II Bravo III Blackhawk | JLM Marine

U Joint Yoke Oil Seal – Fits Mercruiser Bravo I, II, III & Blackhawk (1988-Up)

This U Joint Yoke Oil Seal is designed for Mercruiser Bravo I, Bravo II, Bravo III (1988 & Up, Serial Range 0B664190 & Up), and Blackhawk (1994-1995, Serial Range 0F186717 & Up) sterndrive outdrives. Engineered to prevent gear oil leakage and protect critical driveline components, this seal ensures reliable performance in demanding marine environments.

Direct Replacement for OEM Part Numbers: 26-807006, 26-18816, 86730

• Designed for Mercruiser Bravo and Blackhawk sterndrive applications
• Prevents gear oil leakage at the U-joint yoke interface
• Aftermarket replacement built to OEM specifications

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 U Joint Yoke Oil Seal

Installation Guide

1. Disconnect the battery and raise the sterndrive to the full-up position for access. Secure the drive with appropriate support.
2. Remove the propeller, lower unit, and intermediate housing following your service manual procedures.
3. Carefully extract the old U-joint yoke oil seal using a seal puller or flathead screwdriver. Take care not to damage the seal bore.
4. Clean the seal bore thoroughly, removing all old seal residue, dirt, and corrosion.
5. Inspect the seal bore and U-joint yoke surface for wear, scoring, or damage. Replace any damaged components before proceeding.
6. Lightly coat the new seal's outer diameter and sealing lip with marine-grade gear oil.
7. Position the new seal squarely in the bore with the lip facing inward (toward the gear oil). Use a seal driver or appropriately sized socket to press the seal evenly into place until it seats flush.
8. Verify that the seal is fully seated and properly aligned in the bore.
9. Reassemble the U-joint, intermediate housing, and lower unit, torquing all fasteners to manufacturer specifications.
10. Refill the lower unit with the correct marine gear oil and check for proper oil level.
11. Reinstall the propeller and perform a visual inspection for any leaks around the seal area.
12. Reconnect the battery, perform a test run, and recheck for leaks after operation.

Troubleshooting & FAQ

Q: How do I confirm this seal fits my Mercruiser sterndrive?
A: Check your sterndrive model and serial number against the compatibility table above. Bravo I, II, III models from 1988 & up (serial 0B664190 & up) and Blackhawk 1994-1995 (serial 0F186717 & up) are compatible. You can also cross-reference OEM part numbers 26-807006, 26-18816, or 86730.

Q: What are the signs that my U-joint yoke seal needs replacement?
A: Common symptoms include visible gear oil leaking from the U-joint area, low gear oil levels requiring frequent top-ups, or oil residue around the gimbal housing. If you notice any of these signs, inspect and replace the seal promptly to prevent damage to the U-joint and bearings.

Q: How often should I replace this seal?
A: Replace the U-joint yoke seal whenever you remove the lower unit for service, or if you observe any signs of leakage. It is also recommended to replace it during major drive servicing or U-joint replacement as preventive maintenance.

Q: Can I install this seal without special tools?
A: While it's possible to install the seal with basic hand tools, a seal driver or appropriately sized socket is highly recommended to ensure even, proper seating without damaging the seal or bore. Professional installation is advised for best results.

Q: Is this an OEM part or 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.