U Joint Yoke Oil Seal – Fits MerCruiser Bravo I II III Blackhawk (Replaces 26-807006, 26-18816, 86730)

Product Details

This U Joint Yoke Oil Seal is designed for MerCruiser Bravo I, II, III, and Blackhawk sterndrives from 1988 and up. Compatible with Bravo I, Bravo II, and Bravo III models beginning at serial range 0B664190 & Up, as well as Blackhawk units from 1994–1995 (serial range 0F186717 & UP), this seal delivers reliable protection for your sterndrive's U-joint yoke assembly.

Direct replacement for OEM part numbers 26-807006, 26-18816, and 86730, ensuring cross-compatibility across multiple MerCruiser service references.

• Aftermarket replacement engineered to OEM specifications
• Prevents lubricant leakage and contamination in sterndrive yoke assemblies
• Suitable for both fresh and saltwater applications

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

Part Type

U Joint Yoke Oil Seal

Application

MerCruiser Sterndrive Outdrives

Compatible Models

Bravo I, Bravo II, Bravo III, Blackhawk

Replaces OEM

26-807006, 26-18816, 86730

What's in the Box

Package contents are not specified in the provided data. Verify with seller before purchase if you require confirmation of included components.

Installation Notes

1. Disconnect the battery and remove the sterndrive unit from the transom assembly following manufacturer service procedures.
2. Drain all lubricant from the outdrive and carefully disassemble the U-joint yoke housing.
3. Remove the old oil seal, taking care not to damage the sealing surface or bearing race.
4. Clean the seal bore thoroughly, removing any debris, corrosion, or old sealant residue.
5. Lightly coat the new seal's outer diameter with a marine-grade sealant or lubricant as recommended by your service manual.
6. Press the new seal into place using a seal driver or appropriately sized socket to ensure even seating.
7. Reassemble the U-joint yoke assembly, torquing all fasteners to specification.
8. Refill the outdrive with the correct type and quantity of gear lubricant.
9. Reinstall the sterndrive and perform a visual inspection for leaks after initial operation.

Troubleshooting & FAQ

How do I know if my yoke seal needs replacement?

Common signs include visible lubricant leakage near the U-joint assembly, low fluid levels in the outdrive, or contamination of the gear oil. Inspect during routine maintenance intervals or if you notice dripping beneath the sterndrive.

Will this seal fit both Bravo II and Bravo III drives?

Yes, this seal is compatible with Bravo I, Bravo II, and Bravo III models from serial range 0B664190 & Up, as well as Blackhawk units from 1994–1995. Always verify your serial number before ordering.

Can I install this seal without removing the entire outdrive?

In most cases, full outdrive removal is necessary to access the U-joint yoke assembly safely. Consult your service manual for model-specific disassembly procedures.

What type of lubricant should I use during installation?

Use a marine-grade lubricant or sealant compatible with nitrile or synthetic rubber seals. Avoid petroleum-based products that may degrade the seal material over time.

How often should this seal be replaced?

Replace the yoke seal whenever you observe leakage, during major outdrive service, or as part of a scheduled rebuild. Many technicians recommend inspection every 100 operating hours or annually.

Is there a difference between the three OEM part numbers listed?

Part numbers 26-807006, 26-18816, and 86730 are direct equivalents or supersessions. MerCruiser has updated part numbering over time, but all cross-reference to the same functional seal.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

• Verify images/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.