Gearcase Seal Kit – Fits Mercury/Mariner 65-115 HP (Replaces 8M0088081, 46-8M0088081)
Gearcase Seal Kit – Fits Mercury/Mariner 65-115 HP (Replaces 8M0088081, 46-8M0088081) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Gearcase Seal Kit – Fits Mercury/Mariner 65-115 HP (Replaces 8M0088...
Product Details
This Gearcase Seal Kit – Fits Mercury/Mariner 65-115 HP is designed for Mercury/Mariner 4-Stroke outboards (65–115 HP) manufactured from 2014 onwards, specifically for serial numbers 2B080987 and up, and 2B095049 and up. It provides the essential seals to repair leaks and perform maintenance on the lower unit.
It serves as a direct aftermarket replacement for Mercury OEM part number 8M0088081 and cross-references with Sierra 46-8M0088081, XARONF 8M0088081, YiheoZux 8M0088081, and ZDCBMDB 8M0088081.
- Installation Location: Mounts in the lower unit gearcase assembly.
- Purpose: Prevents water intrusion and lubricant leakage from the gear housing.
- Kit Type: Aftermarket replacement built to meet or exceed original equipment specifications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 8M0088081 |
| Sierra | 46-8M0088081 |
| XARONF | 8M0088081 |
| YiheoZux | 8M0088081 |
| ZDCBMDB | 8M0088081 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is designed exclusively for the following Mercury and Mariner outboard engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 65 JET | 65 | 4-Stroke | 2014 and up | 8M0088081 | Serial #2B080987 & Up, EFI 2B095049 & Up |
| Mercury | 75 | 75 | 4-Stroke | 2014 and up | 8M0088081 | Serial #7F754131F 2014, Sea Pro 2B095049 & Up, 2B080987 & Up |
| Mercury | 80 | 80 | 4-Stroke | 2014 and up | 8M0088081 | Serial #7F804131F 2014, 2B095049 & Up, 2B080987 & Up |
| Mercury | 90 | 90 | 4-Stroke | 2014 and up | 8M0088081 | Serial #7F904531F 2014, 2B095049 & Up, 2B080987 & Up |
| Mercury | 100 | 100 | 4-Stroke | 2014 and up | 8M0088081 | Serial #7100F131F, 7100F531F 2014, 2B095049 & Up, 2B080987 & Up |
| Mercury | 115 | 115 | 4-Stroke | 2014 and up | 8M0088081 | Serial #7115F631F, 7115F531F, 7115F231F, 7115F131F 2014 |
Technical Specs
- Product Type
- Gearcase Seal Kit
- Installation
- Lower Unit/Gearcase
- Product Dimensions
- Height: 5.0 in; Width: 20.0 in; Length: 24.0 in
- Weight
- 0.122 kg (0.27 lbs)
- Warranty
- 1 Year (varies by manufacturer)
- Other Technical Attributes
- Aftermarket replacement for OEM part #8M0088081
What’s in the Box
- 1 x Gearcase Seal Kit (Replaces 8M0088081)
Installation Notes
- Ensure the engine is off, cool, and disconnected from the battery.
- Drain the gearcase lubricant into a suitable container.
- Remove the propeller assembly, followed by the lower unit from the engine's midsection.
- Carefully disassemble the gearcase, taking pictures and noting the order of components.
- Remove all old seals, O-rings, and gaskets, being careful not to scratch housing surfaces.
- Thoroughly clean all mating surfaces and inspect components for wear or damage.
- Install the new seals from the kit, applying a light coat of marine grease to the seal lips.
- Reassemble the gearcase, ensuring all components are correctly seated. Tighten all bolts to the manufacturer's specified torque values.
- Refill the gearcase with fresh, appropriate-grade marine lubricant.
- Reinstall the lower unit and propeller, then test for proper function and leaks before returning to service.
Troubleshooting & FAQ
How do I know if this gearcase seal kit fits my engine?
This kit is designed for Mercury/Mariner 65–115 HP 4-stroke outboards from 2014 and newer. To ensure a perfect match, you must verify your engine's serial number against the compatibility ranges listed in the product description: 2B080987 and up, or 2B095049 and up for EFI models.
What are the common signs of a failing gearcase seal?
The most common symptom is milky, grey, or water-contaminated gear lube, which indicates water intrusion. Other signs include a visible oil sheen on the water around your lower unit, a persistent low lubricant level, or gear oil leaking from the propeller shaft area.
Does this kit include every single seal for the lower unit?
This kit is a comprehensive aftermarket replacement for OEM part 8M0088081 and includes all the primary seals needed for a standard gearcase resealing job. However, some specific engine sub-models may have unique additional seals. Always compare the contents of this kit with your existing parts before installation.
What is the recommended replacement interval for gearcase seals?
Gearcase seals don't have a fixed replacement schedule. They should be inspected during every annual service or 100-hour interval when you change the gear lube. Replace them immediately if you find any evidence of water intrusion or lubricant leakage.
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 vs 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.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
