Shim Set – Fits Mercury/Mercruiser Bravo I & II Sterndrives (Replaces 15-86749A1)
Shim Set – Fits Mercury/Mercruiser Bravo I & II Sterndrives (Replaces 15-86749A1) is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Shim Set – Fits Mercury/Mercruiser Bravo I & II Sterndrives (Re...
Product Details
This is an aftermarket Shim Set – Fits Mercury/Mercruiser Bravo I & II Sterndrives, designed for precise gear adjustments within the sterndrive gear housing. It is compatible with a wide range of Mercury/Mercruiser applications, including the Bravo One, Bravo Two, Bravo Three, and Bravo XR/XZ series drives.
This kit serves as a direct replacement for OEM part numbers 15-86749A1 and 86749A1.
- Installation Location: Mounts inside the Bravo sterndrive gear housing.
- Function: Used to set proper gear backlash and spacing during assembly or repair.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 15-86749A1 |
| Mercury | 86749A1 |
| Mercruiser | 15-86749A1 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury/Mercruiser sterndrives, this shim set is used for achieving correct gear alignment in the following Bravo drive models.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Mercury | BRAVO ONE | 15-86749A1 | Used in gear housing |
| Mercury | BRAVO TWO | 15-86749A1 | Used in gear housing |
| Mercury | BRAVO THREE | 15-86749A1 | Used in gear housing |
| Mercury | BRAVO X ONE | 15-86749A1 | Used in gear housing |
| Mercury | BRAVO X TWO | 15-86749A1 | Used in gear housing |
| Mercury | BRAVO X THREE | 15-86749A1 | Used in gear housing |
| Mercury | BRAVO XR ONE | 15-86749A1 | Used in gear housing |
| Mercury | BRAVO XR THREE | 15-86749A1 | Used in gear housing |
| Mercury | BRAVO XR SPORTMASTER | 15-86749A1 | Used in gear housing |
| Mercury | BRAVO XZ ONE | 15-86749A1 | Used in gear housing |
| Mercury | INTEGRATED TRANSOM | 15-86749A1 | Used in gear housing |
| Mercury | HI PERFORMANCE TRANSOM | 15-86749A1 | Used in gear housing |
Technical Specs
- Product Type
- Shim Set
- Installation
- Bravo Sterndrive Gear Housing
- Dimensions
- 11.5" L x 9.0" W x 0.4" H
- Weight
- 0.03 kg (0.07 lb)
- Other Technical Attributes
- Used for gear adjustments in Bravo drive units
What’s in the Box
- 1 x Shim Set (Replaces 15-86749A1)
Installation Notes
- Always consult your official service manual before beginning work.
- Drain the gear lube from the sterndrive unit completely.
- Carefully disassemble the gear housing to access the internal gears and bearings.
- Using a dial indicator or appropriate metrology tools, measure the gear backlash and/or bearing preload as specified in the manual.
- Select the necessary combination of shims from this set to achieve the manufacturer's specified tolerance.
- Install the selected shims in the correct location (e.g., behind a bearing race).
- Re-measure to confirm the adjustment is within specification.
- Reassemble the gear housing, using new seals and gaskets as needed.
- Refill the sterndrive with the correct type and amount of high-quality marine gear lube.
- Check for leaks and proper gear engagement before operation.
Troubleshooting & FAQ
How do I know which specific shims to use from the set?
The exact shims required depend on precise measurements (like gear backlash) taken during the assembly process. You must use a dial indicator and follow the measurement procedures outlined in your sterndrive's official service manual to determine the correct shim thickness needed.
What are signs my sterndrive needs to be re-shimmed?
Common symptoms include excessive gear noise (whining or clunking, especially when shifting), difficulty engaging gears, or visible metal shavings in the gear lube. These issues often point to improper gear meshing, which can be corrected by re-shimming during a gear case rebuild.
Is this kit all I need to service my gear case?
No. This is a shim set specifically for adjusting gear tolerances. A complete sterndrive service or rebuild will typically require additional parts, such as new seals, gaskets, bearings, and o-rings, which must be purchased separately.
Will this fit all Bravo models listed?
Yes, this set is designed for the Bravo I, II, III, and various X, XR, and XZ models. However, always double-check your specific part number and service manual requirements before purchasing to ensure a perfect match.
Can I reuse my old shims?
It is not recommended. Shims are precision components subject to wear and compression over time. Using new shims from a quality set is essential for achieving accurate and lasting gear adjustments.
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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