Bellow Ring Installation Tool – Fits Mercury MerCruiser Alpha 1 Gen 2, Bravo, Blackhawk (Replaces 91-818162)
Bellow Ring Installation Tool – Fits Mercury MerCruiser Alpha 1 Gen 2, Bravo, Blackhawk (Replaces 91-818162) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Bellow Ring Installation Tool – Fits Mercury MerCruiser Alpha 1 Gen...
Bellow Ring Installation Tool – Fits Mercury MerCruiser Alpha 1 Gen 2, Bravo, Blackhawk (Replaces 91-818162) is backordered and will ship as soon as it is back in stock.
Product Details
This Bellow Ring Installation Tool is essential for servicing Mercury MerCruiser stern drives, including Alpha One Gen 2, Bravo series, and Blackhawk models. It is specifically designed to properly install the aluminum retainer ring into the U-joint bellows, ensuring a secure fit without damaging the components. This tool must be used in conjunction with an Engine Alignment Tool for correct installation.
This part is a direct replacement for Mercury MerCruiser OEM part 91-818162 and aftermarket references such as Sierra 18-9870 and MBSMFG BRSIT-D23.
- Installs the U-joint bellows aluminum retainer ring.
- Requires manual use with an alignment tool and light hammer taps.
- Available in durable PVC Plastic or Aluminum, depending on the selected option.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury MerCruiser | 91-818162 |
| Sierra | 18-9870 |
| MBSMFG | BRSIT-D23 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This tool is confirmed for use on the following Mercury MerCruiser drive units.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Mercury MerCruiser | Alpha One Gen 2 | 91-818162 | U-Joint bellows installation |
| Mercury MerCruiser | Bravo | 91-818162 | U-Joint bellows installation |
| Mercury MerCruiser | Blackhawk | 91-818162 | U-Joint bellows installation |
| Mercury MerCruiser | Vazer | 91-818162 | Per MercruiserParts.com source |
Technical Specs
- Product Type
- Installation Tool
- Installation
- Manual; requires light hammer taps
- Housing Material
- PVC Plastic (aftermarket) or Aluminum (OEM/aftermarket options)
- Housing Color
- Black or Silver (depending on material)
- Other Technical Attributes
- Used with Engine Alignment Tool to properly install aluminum ring into U-joint bellows
What’s in the Box
- 1 x Bellow Retainer Ring Installation Tool (91-818162)
Installation Notes
- Ensure the drive is properly prepared and an Engine Alignment Tool is correctly in place.
- Apply a suitable marine-grade lubricant to the U-joint bellows and the new aluminum retainer ring.
- Carefully position the retainer ring over the end of the bellows.
- Place the Bellow Ring Installation Tool over the retainer ring.
- Using a mallet or hammer, apply light, even taps to the installation tool to drive the ring into its groove.
- Continue tapping around the tool until the ring is fully and evenly seated.
- Visually inspect the ring to confirm it is secure and has not damaged the bellows.
Troubleshooting & FAQ
Which sterndrives is this tool designed for?
This tool fits Mercury MerCruiser Alpha One Gen 2, Bravo Series (I, II, III), Blackhawk, and Vazer drives. It is essential for working on the U-joint bellows for these models.
Do I actually need this tool for the installation?
Yes. This tool is specifically designed to install the aluminum retainer ring evenly and without damage. Attempting the installation without it can lead to a damaged bellows or a poor seal, causing water leaks and gimbal bearing failure.
Is there a difference between the PVC and aluminum versions?
The original OEM tool is typically made of aluminum. Aftermarket versions are available in both high-strength PVC and aluminum. Both materials are durable and designed to perform the installation correctly. The PVC version offers excellent value and corrosion resistance.
What are the signs of a failed bellows retaining ring?
The primary symptom of a failed or improperly installed retaining ring is water intrusion into the gimbal area. This can lead to a rusted gimbal bearing, which often produces a grinding or roaring noise when turning the wheel, especially out of the water.
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.
