Tilt End Cap & Seals – Fits Mercury 75-250HP Outboard (Replaces 878239A02, 811606, 878239A1)

Tilt End Cap & Seals – Fits Mercury 75-250HP Outboard (Replaces 878239A02, 811606, 878239A1)

This replacement tilt cylinder end cap with seals is designed for a wide range of Mercury Marine V6 outboard engines from 1991 to 2017, rated from 75 to 250HP. It covers 2-stroke and 4-stroke models, including Optimax, EFI, and carbureted versions.

This assembly is a direct replacement for multiple OEM and aftermarket part numbers, ensuring broad compatibility for servicing your hydraulic trim/tilt system.

• Includes one tilt cylinder end cap with pre-installed seals for a complete repair.
• Constructed from Aircraft-Grade Aluminum with a Military Grade Type 3 Hard Coat Anodized finish for superior corrosion resistance and durability.
• Equipped with high-performance Viton and High-Grade Urethane seals designed to withstand the harsh 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 Tilt End Cap with Seals (Replaces 878239A02, 878239A1, 811606, 8M0090322)

Installation Guide

1. Safely secure the outboard motor in the fully tilted position using a motor support bracket.
2. Thoroughly clean the area around the tilt cylinder end cap to prevent dirt and debris from entering the hydraulic system.
3. Using a compatible spanner wrench, carefully loosen and remove the old tilt end cap. Be prepared for some hydraulic fluid to escape.
4. Inspect the tilt ram rod and the inside of the cylinder for any scoring, pitting, or damage. Address any issues before proceeding.
5. Lightly lubricate the new seals on the replacement end cap with fresh hydraulic fluid.
6. Carefully thread the new end cap onto the cylinder by hand, ensuring it does not cross-thread.
7. Tighten the end cap to the manufacturer's specified torque. Do not overtighten.
8. Top off the hydraulic fluid reservoir and follow the manufacturer's procedure to bleed any air from the system.

Troubleshooting & FAQ

Q: How do I know if this end cap fits my Mercury outboard?

A: This cap is designed for most Mercury V6 2-stroke and 4-stroke engines from 75-250HP (1991-2017). To confirm fitment, please check the 'Compatible Engine Models' table on this page and cross-reference your engine's original part number (e.g., 878239A02, 878239A1). Note: This part does not fit L6 Verado models.

Q: What are the signs that my tilt end cap is failing?

A: The most common signs of a failing end cap are hydraulic fluid leaking around the tilt ram where it exits the cylinder, a "spongy" or weak tilt response, or the outboard motor slowly drifting down from its tilted position.

Q: What makes this different from the original Mercury part?

A: This is an aftermarket part engineered to meet or exceed OEM specifications. It features an upgraded housing made of aircraft-grade aluminum with a Military Grade Type 3 hard anodized finish for enhanced corrosion resistance, along with high-quality Viton/Urethane seals comparable to the original.

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.