Mercury – Quicksilver 815565 Bearing Carrier Oil Seal | Mercury & Mariner 150–300HP Outboards | Bravo I XR/XZ Sterndrives | 815565

Overview

Keeping water out and oil in — that’s the quiet job of the Quicksilver 815565 Bearing Carrier Oil Seal, and it’s one that makes a big difference in how long your outboard or sterndrive lasts. This OEM seal fits Mercury and Mariner 2-stroke and 4-stroke outboards from 150–300 horsepower, as well as MerCruiser Bravo I XR and XZ sterndrives.

It’s built for the harshest marine environments, sealing critical driveline components from water intrusion while holding oil pressure steady. When it comes to protecting your lower unit from corrosion and wear, this little part is one of the most important lines of defense.

Key Features

• Purpose: Prevents water intrusion and oil leakage around the bearing carrier to protect the gearcase.
• Fitment: Designed for Mercury and Mariner 150–300HP 2-stroke and 4-stroke outboards, and MerCruiser Bravo I XR/XZ sterndrives.
• Construction: Made from marine-grade elastomer with a precision-ground sealing lip for long-lasting performance.
• OEM Quality: Meets Mercury Marine factory specs for sealing pressure, fitment, and durability.
• Performance Proven: Tested to maintain seal integrity under high load, temperature, and saltwater exposure.

Engine & Boat Compatibility

• Mercury and Mariner 150–300HP outboards (2-stroke & 4-stroke)
• MerCruiser Bravo I XR and Bravo I XZ sterndrives
• Used across offshore fishing boats, center consoles, and high-performance rigs

Performance & Practical Benefits

A healthy lower unit depends on good seals. The 815565 Bearing Carrier Oil Seal keeps the gear oil where it belongs — inside — while blocking out the saltwater and debris that can cause internal damage. A worn or leaking seal can lead to gear wear, corrosion, or even total gearcase failure if left unchecked.

This OEM replacement is engineered for tight tolerances and consistent sealing pressure, even when the housing flexes under load. It’s made from high-quality rubber that stays pliable through extreme temperature swings, helping your lower unit stay lubricated, cool, and protected. Replace it as part of regular maintenance and you’ll save yourself a lot of headaches (and repair bills) down the line.

Why Buy OEM

Mercury’s OEM seals are designed specifically for the company’s gearcases — not just “close enough” like some aftermarket alternatives. Each seal is tested for perfect fit, resistance to oil breakdown, and long-term sealing under pressure.

Aftermarket options often use cheaper rubber compounds that can harden or shrink, leading to leaks. A genuine Quicksilver seal fits right the first time and holds up season after season. It’s a small, inexpensive part that protects some of your most valuable hardware.

FAQ

Q1: What engines use the Quicksilver 815565 seal?
A: It fits Mercury and Mariner 150–300HP 2-stroke and 4-stroke outboards and MerCruiser Bravo I XR/XZ sterndrives.

Q2: What does this seal do?
A: It prevents water from entering and gear oil from escaping the lower unit, protecting gears and bearings.

Q3: Is it hard to replace?
A: It requires some mechanical skill and proper tools — most owners have a Mercury technician perform the service during lower unit maintenance.

Q4: How often should it be inspected?
A: Check during every gear oil change; replace it if you see oil weeping, water in the lube, or a damaged lip.

Q5: Can I use aftermarket seals?
A: You can, but OEM seals are built to Mercury’s specifications and provide the best protection for your gearcase.