Exhaust Bellows Expander Tool – Fits MerCruiser Alpha One, Bravo, Blackhawk (Replaces 91-45497A1)
Exhaust Bellows Expander Tool – Fits MerCruiser Alpha One, Bravo, Blackhawk (Replaces 91-45497A1) 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
Exhaust Bellows Expander Tool – Fits MerCruiser Alpha One, Bravo, B...
Product Details
This Exhaust Bellows Expander Tool is a specialized, scissor-type instrument designed to stretch exhaust bellows for easier installation. It is specifically engineered for a wide range of MerCruiser stern drives, including Alpha One, Alpha One Generation II, Bravo One, Bravo Two, Bravo Three, Blackhawk, MC-1, and R/MR models.
This tool directly replaces OEM part number 91-45497A1 and interchanges with several aftermarket equivalents, including Sierra 18-9847, GLM 90360, and Mallory 79811.
- Features a manual, scissor-type action with a screw lock for precise control.
- Equipped with a vinyl, anti-slip grip for secure handling during use.
- Note: The stern drive must be removed before this tool can be used.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 91-45497A1 |
| Mercury/MerCruiser | 8M0096108 |
| Sierra | 18-9847 |
| GLM | 90360 |
| Mallory | 79811 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This tool is designed for the following MerCruiser stern drive models.
| Brand | Drive Type | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| MerCruiser | Alpha One | Various | 4-Stroke | All | 91-45497A1 |
| MerCruiser | Alpha One Gen II | Various | 4-Stroke | All | 91-45497A1 |
| MerCruiser | Bravo One | Various | 4-Stroke | All | 91-45497A1 |
| MerCruiser | Bravo Two | Various | 4-Stroke | All | 91-45497A1 |
| MerCruiser | Bravo Three | Various | 4-Stroke | All | 91-45497A1 |
| MerCruiser | Blackhawk | Various | 4-Stroke | All | 91-45497A1 |
| MerCruiser | MC-1 | Various | 4-Stroke | All | 91-45497A1 |
| MerCruiser | R | Various | 4-Stroke | All | 91-45497A1 |
| MerCruiser | MR | Various | 4-Stroke | All | 91-45497A1 |
Technical Specs
- Product Type
- Exhaust Bellows Expander Tool
- Installation
- Manual; Scissor-type with screw lock
- Handle Type
- Scissor handle with vinyl/anti-slip grip
- Material
- Steel
- Application
- Stretches exhaust bellows for installation
- Compatible Drives
- MerCruiser Alpha One, Alpha One Gen II, Bravo One, Bravo Two, Bravo Three, Blackhawk, MC-1, R/MR
- Usage Notes
- Stern drive must be removed before use
- Country of Origin
- USA (for MBS/OEM version)
What’s in the Box
- 1 x Exhaust Bellows Expander Tool (Replaces 91-45497A1/8M0096108)
Installation Notes
- Install the bellows onto the expander tool arms.
- Pass the bellows through the vent hole in the gimbal housing.
- Expand the tool to stretch the bellows into place and tighten the hose clamps.
Note: The stern drive must be fully removed from the vessel before using this tool.
Troubleshooting & FAQ
Which MerCruiser drives is this tool compatible with?
This tool is designed for a broad range of MerCruiser stern drives: Alpha One, Alpha One Gen II, Bravo One, Bravo Two, Bravo Three, Blackhawk, MC-1, and R/MR models.
Is it necessary to remove the stern drive to use this tool?
Yes, for proper access and safe installation, the stern drive assembly must be removed from the vessel before you can use this tool to install the exhaust bellows.
What is this tool made of?
The expander tool is constructed from durable steel to handle the force required to stretch the bellows. It also features a vinyl, anti-slip grip for secure handling.
How do I use this tool?
First, fit the exhaust bellows over the arms of the tool. Next, pass the bellows through the appropriate opening in the gimbal housing. Finally, operate the scissor handle to stretch the bellows into position so you can tighten the clamp.
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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