Gearcase Gasket and Seal Kit – Fits OMC V6/V8/800 Series (Replaces 982946)
Gearcase Gasket and Seal Kit – Fits OMC V6/V8/800 Series (Replaces 982946) is backordered and will ship as soon as it is back in stock.
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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 Gasket and Seal Kit – Fits OMC V6/V8/800 Series (Replaces ...
Product Details
This Gearcase Gasket and Seal Kit is designed for OMC Stern Drive models, including V6, V8, 800 Series, 3.8L, 5.0L, and 5.7L engines manufactured between 1980 and 1985. It provides the essential components for servicing the lower gearcase. Please note, this kit is not compatible with OMC Cobra Stern Drive models.
It serves as a direct replacement for several OEM and aftermarket part numbers, including OMC 982946/0982946, Sierra Marine 18-2665, SEI Marine 95-105-11K, OBR Red Rhino OS-124, Mallory Marine 9-74400, and GLM 87630.
- Application: For lower gearcase service.
- Installation: Professional installation is recommended.
- Compatibility: Specifically for non-Cobra OMC Stringer drives (1980–1985).
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 982946 / 0982946 |
| Sierra Marine | 18-2665 |
| SEI Marine | 95-105-11K |
| OBR Red Rhino | OS-124 |
| Mallory Marine | 9-74400 |
| GLM | 87630 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is engineered for a range of OMC Stern Drive engines produced before the Cobra series.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| OMC | V6 Stern Drive | Various | 4-Stroke | 1980–1985 | 982946 | Except Cobra models |
| OMC | V8 Stern Drive | Various | 4-Stroke | 1980–1985 | 982946 | Except Cobra models |
| OMC | 800 Series Stern Drive | Various | 4-Stroke | 1980–1985 | 982946 | Except Cobra models |
| OMC | 3.8L Stern Drive | Various | 4-Stroke | 1980–1985 | 982946 | Except Cobra models |
| OMC | 5.0L Stern Drive | Various | 4-Stroke | 1980–1985 | 982946 | Except Cobra models |
| OMC | 5.7L Stern Drive | Various | 4-Stroke | 1980–1985 | 982946 | Except Cobra models |
Technical Specs
- Product Type
- Gearcase Gasket and Seal Kit
- Application
- For lower gearcase application
- Installation
- Professional recommended
- Dimensions
- 19.0" L x 12.0" W x 2.0" H
- Weight
- 0.44 lb (0.2 kg)
- Warranty
- Standard manufacturer warranty
What’s in the Box
- Complete Gasket and Seal Kit for OMC Lower Gearcase (Replaces 982946)
Installation Notes
- Drain the gearcase oil completely.
- Remove the propeller and mounting hardware.
- Unbolt and carefully separate the lower gearcase from the upper housing.
- Systematically disassemble the gearcase, keeping all parts in order.
- Remove all old seals, gaskets, and O-rings, taking care not to scratch any mating surfaces.
- Thoroughly clean all components and surfaces of old sealant and debris.
- Install the new seals and gaskets from the kit, lightly lubricating them with marine grease.
- Reassemble the gearcase, ensuring all components are correctly seated.
- Torque all bolts to the manufacturer's specified values.
- Refill the gearcase with the correct type and amount of marine gear lube.
- Check for leaks before and after test operation.
Troubleshooting & FAQ
Is this kit compatible with OMC Cobra models?
No, this kit is specifically for OMC Stringer stern drives from 1980–1985 and is not compatible with any OMC Cobra models.
What are the signs that my gearcase seals are failing?
Common signs include milky or water-contaminated gear oil, visible oil leaks around the propeller shaft or drain plugs, or a persistent need to top off the gear lube.
Does this kit fit both V6 and V8 OMC engines?
Yes, this kit is designed for the lower units on OMC V6, V8, 800 Series, and specific liter-designated engines (3.8L, 5.0L, 5.7L) within the 1980–1985 year range.
What is the difference between this and an OEM kit?
This is an aftermarket kit designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, form, and function. It provides a cost-effective solution without compromising on quality or performance.
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
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