Engine Coupler Kit – Fits MerCruiser 120/2.5L & 140/3.0L Engines (Replaces 12632A7)
Engine Coupler Kit – Fits MerCruiser 120/2.5L & 140/3.0L Engines (Replaces 12632A7) 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
Product Details
This Engine Coupler Kit – Fits MerCruiser 120/2.5L & 140/3.0L Engines (Replaces 12632A7) provides a reliable connection between the engine and sterndrive for MerCruiser 120 HP (2.5L) and 140 HP (3.0L) 4-stroke models manufactured between 1987 and 1993.
It serves as a direct replacement for Mercury-MerCruiser parts 12632A7 and 12632A3, Sierra 18-2195, and aftermarket reference AM12632A7.
- Installation: Mounts directly to the flywheel.
- Design: Features a durable triangular configuration.
- Maintenance: Includes components for a "Lube for Life" setup, which retains grease within the spline to reduce wear.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury-MerCruiser | 12632A3 | Superseded by 12632A7 |
| Mercury-MerCruiser | 12632A7 | |
| Sierra | 18-2195 | |
| Aftermarket | AM12632A7 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This component is designed for specific MerCruiser I/L4 engines as detailed.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | MCM 120 (2.5L GM 153 I/L4) | 120 | 4-Stroke | 1987–1989 | 12632A7 | Previously 12632A3 |
| MerCruiser | MCM 140 (3.0L GM 181 I/L4) | 140 | 4-Stroke | 1987–1993 | 12632A7 | Previously 12632A3 |
Technical Specs
- Product Type
- Engine Coupler Kit
- Installation
- Flywheel Mount
- Configuration
- Triangular Shape
- Dimensions
- Length: 8.25 in, Width: 11.25 in, Height: 13.5 in
- Weight
- 6.44 kg (14.19 lb)
- Application
- Connects engine to sterndrive
- Other Technical Attributes
- Includes components for "Lube for Life" option that maintains grease within the spline
What’s in the Box
- 1 x Engine Coupler Assembly (Replaces 12632A7)
- 1 x Mounting Hardware Kit
Installation Notes
- Disconnect the battery and follow all safety precautions before beginning work.
- Remove the sterndrive assembly to access the bell housing and engine coupler.
- Unbolt the old engine coupler from the flywheel, noting the orientation.
- Thoroughly clean the flywheel mounting surface to ensure a flat, secure fit.
- Align the new coupler with the flywheel bolt pattern and install the new hardware.
- Torque all mounting bolts to the manufacturer-specified values in a star pattern.
- Apply marine-grade spline grease (if not pre-lubricated) before reinstalling the sterndrive.
- Reinstall the sterndrive, ensuring proper alignment of the driveshaft splines with the coupler.
- Reconnect the battery and test the engine/drive for proper operation before use.
Troubleshooting & FAQ
What are the signs of a failing engine coupler?
Common symptoms include a loud rattling or knocking noise from the bell housing area, excessive vibration during acceleration, or difficulty shifting into gear. A visual inspection may reveal worn or damaged splines or cracked rubber components.
Is this coupler compatible with engines outside the listed years (1987–1993)?
We can only guarantee fitment for the MerCruiser models and years specified. Using this part on other models is not recommended, as dimensions and spline counts may differ.
What does the "Lube for Life" feature do?
This design helps to permanently seal grease within the splined connection between the sterndrive shaft and the engine coupler. This significantly reduces wear and minimizes the need for periodic re-greasing.
Can I install this engine coupler myself?
While DIY installation is possible for experienced mechanics with the proper tools (e.g., engine alignment tool), professional installation is strongly recommended to ensure correct alignment, torque, and safe operation.
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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