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Transom Seal – Fits MerCruiser Alpha One, R, MR, MC-1 (1983–1990) (Replaces 65533A1)
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Transom Seal – Fits MerCruiser Alpha One, R, MR, MC-1 (1983–1990) (Replaces 65533A1)
This transom seal is designed for MerCruiser Alpha One Generation 1, R, MR, and MC-1 stern drive models manufactured from 1983 to 1990. It creates a robust, watertight barrier between the gimbal housing and the boat transom, preventing leaks and protecting critical drive components.
This part is a direct replacement for MerCruiser 65533A1, GLM 86712, and Sierra 18-2692.
- Installation Location: Mounts between the gimbal housing and the transom.
- Material: Constructed from a durable foam/rubber composite to ensure a lasting seal.
- Function: Sits near the perimeter of the gimbal ring mating surface for a secure fit.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| MerCruiser | 65533A1 |
| GLM | 86712 |
| Sierra | 18-2692 |
| REC | REC65533A1 |
Compatible Engine Models
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| MerCruiser | Alpha One Gen 1 | Various | 1983–1990 | 65533A1 | |
| MerCruiser | R | Various | 1983–1990 | 65533A1 | |
| MerCruiser | MR | Various | 1983–1990 | 65533A1 | |
| MerCruiser | MC-1 120 | 120 | 1983–1990 | 65533A1 | Stern Drive Models |
| MerCruiser | MC-1 140 | 140 | 1983–1990 | 65533A1 | Stern Drive Models |
| MerCruiser | MC-1 165 | 165 | 1983–1990 | 65533A1 | Stern Drive Models |
| MerCruiser | MC-1 228 | 228 | 1983–1990 | 65533A1 | Stern Drive Models |
| MerCruiser | MC-1 250 | 250 | 1983–1990 | 65533A1 | Stern Drive Models |
| MerCruiser | MC-1 485 | 485 | 1983–1990 | 65533A1 | Stern Drive Models |
| MerCruiser | MC-1 898 | 898 | 1983–1990 | 65533A1 | Stern Drive Models |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Transom Gasket Seal |
| Installation | Mounts between gimbal housing and transom |
| Housing Material | Foam/Rubber Composite |
| Housing Color | Black |
| Warranty | 1 Year (varies by seller) |
| Other Technical Attributes | Sits near the perimeter of the gimbal ring mating surface |
Package Contents
1 x Transom Gasket Seal (Replaces 65533A1)
Installation Guide
- Safety First: Disconnect the battery and ensure the stern drive is properly supported before beginning work.
- Remove Drive: Detach the stern drive assembly from the gimbal housing according to your service manual.
- Access the Seal: Once the drive is removed, the gimbal housing and transom assembly will be accessible. Locate the old transom seal.
- Remove Old Seal: Carefully peel or scrape away the old transom seal from the mounting surface.
- Clean Surface: Thoroughly clean the mating surfaces on both the gimbal housing and the boat transom. Ensure they are free of old adhesive, sealant, and debris.
- Install New Seal: Position the new transom gasket seal onto the transom, aligning it with the mounting holes.
- Reassemble: Reinstall the gimbal housing and stern drive assembly, torquing all fasteners to the manufacturer's specifications.
- Check for Leaks: After reassembly, lower the drive into the water and carefully inspect for any signs of leaks around the transom assembly.
Troubleshooting & FAQ
Q: How do I confirm this fits my engine?
A: This seal is designed specifically for MerCruiser Alpha One Gen 1, R, MR, and MC-1 models from 1983 to 1990. Please verify your model and year range against the "Compatible Engine Models" table. Cross-reference the OEM part number 65533A1 to ensure an exact match.
Q: What are the signs of a failing transom seal?
A: The most common sign of a failed transom seal is water leaking into the bilge area, especially when the boat is in the water. You may also notice corrosion around the inner transom plate or damage to the gimbal bearing from water intrusion.
Q: How often should I replace the transom seal?
A: The transom seal should be inspected regularly for signs of wear, cracking, or compression. It is typically replaced whenever the stern drive is removed for major service, such as gimbal bearing or bellows replacement, or immediately if a leak is detected.
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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