Upper Gearcase Seal Kit – Fits MerCruiser Bravo I, II, III, X, XR, XZ & Blackhawk Stern Drives (Replaces 26-16709A1, 26-16709A2)

Vendor: JLM Marine
Availability: In Stock
Product Type: Seal Kit
$60.30
$60.30
Subtotal: $60.30

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Upper Gearcase Seal Kit – Fits MerCruiser Bravo I, II, III, X, XR, XZ & Blackhawk Stern Drives (Replaces 26 - 16709A1, 26 - 16709A2) - JLM Marine Boat Parts Limited

Upper Gearcase Seal Kit – Fits MerCruiser Bravo I, II, III, X, XR, XZ & Blackhawk Stern Drives (Replaces 26-16709A1, 26-16709A2)

$60.30

Upper Gearcase Seal Kit – Fits MerCruiser Bravo I, II, III, X, XR, XZ & Blackhawk Stern Drives (Replaces 26-16709A1, 26-16709A2)

$60.30

Upper Gearcase Seal Kit – Fits MerCruiser Bravo I, II, III, X, XR, XZ & Blackhawk Stern Drives

This complete aftermarket seal kit contains the necessary components to reseal the upper gearcase on MerCruiser Bravo stern drives. It is designed for Bravo I, II, and III models from 1988 and up, as well as Bravo X, XR, XZ, and the Blackhawk variant (1994-1995).

This kit is a direct replacement for MerCruiser part numbers 26-16709A1 and 26-16709A2, as well as aftermarket parts from Sierra, GLM, and Mallory.

  • Engineered to meet OEM specifications for a reliable fit and performance.
  • Comprehensive kit includes O-Rings, Seals, Washers, and Gaskets for a complete service.
  • Broad compatibility across the most popular MerCruiser Bravo stern drive models.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number
MerCruiser 26-16709A1, 26-16709A2
Sierra 18-2643
GLM 87480
Mallory 9-74301

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.

Brand Model Rated HP Years OEM Part No.
MerCruiser Bravo I Various 1988 and Up 26-16709A1/26-16709A2
MerCruiser Bravo II Various 1988 and Up 26-16709A1/26-16709A2
MerCruiser Bravo III Various 1988 and Up 26-16709A1/26-16709A2
MerCruiser Bravo X Various 26-16709A1/26-16709A2
MerCruiser Bravo XR Various 26-16709A1/26-16709A2
MerCruiser Bravo XZ Various 26-16709A1/26-16709A2
MerCruiser Blackhawk Various 1994-1995 26-16709A1/26-16709A2

Technical Specifications

Specification Value
Product Type Upper Gearcase Seal Kit
Installation OEM Specification
Housing Material Various (O-rings, seals, washers)
Compatible Systems Bravo I, II, III, X, XR, XZ, Blackhawk
Application Upper Gearcase

Package Contents

  • O-Rings
  • Seals
  • Washers
  • Oil Seals
  • Gear Housing Drain Screw Gaskets
  • Keepers (#97351)
  • Spring Kit

Installation Guide

  1. Ensure the engine is off and the drive is in a safe, stable position for service. Drain the gear lube from the upper gearcase completely.
  2. Carefully disassemble the upper gearcase components. Keep all parts organized and note their orientation.
  3. Remove all old seals, O-rings, and gaskets. Take care not to scratch or damage any of the sealing surfaces during removal.
  4. Thoroughly clean all mating surfaces to remove old sealant, corrosion, and debris.
  5. Install the new seals and O-rings from the kit. Lightly lubricate them with 2-4-C marine grease or high-quality gear oil as specified by the service manual.
  6. Ensure correct orientation and seating depth for all new oil seals.
  7. Reassemble the gearcase. Torque all bolts and fasteners to the manufacturer's recommended specifications.
  8. Refill the gearcase with fresh, high-performance marine gear lube.
  9. Once filled, pressure test the gearcase according to the service manual to confirm there are no leaks before operation.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Bravo stern drive?

A: This kit is designed for MerCruiser Bravo I, II, and III models from 1988 and up, as well as Bravo X, XR, XZ, and Blackhawk (1994-1995) models. To guarantee fitment, please cross-reference your original part number with those listed: MerCruiser 26-16709A1, 26-16709A2; Sierra 18-2643; GLM 87480; or Mallory 9-74301.

Q: What are the signs that my upper gearcase seals are failing?

A: The most common signs of a failed gearcase seal include observing oil leaks around the upper drive unit, or discovering water has mixed with the gear lube, which gives it a milky or creamy appearance. Prompt replacement is crucial to prevent severe gear damage.

Q: Does this kit include every single seal I might need?

A: This is a comprehensive upper gearcase seal kit that contains all the primary seals, O-rings, gaskets, and washers required for that specific application. We strongly recommend reviewing the 'Package Contents' list and Explosion Diagram to confirm it matches all the components needed for your repair.

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.

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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