Exhaust Bellows Expander Tool – Fits Mercury MerCruiser Alpha I/II, Bravo 1/2/3, and Blackhawk Stern Drives (Replaces 91-45497A1, 8M0096108)
Exhaust Bellows Expander Tool – Fits Mercury MerCruiser Alpha I/II, Bravo 1/2/3, and Blackhawk Stern Drives (Replaces 91-45497A1, 8M0096108) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
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 Mercury MerCruiser Alpha I/II,...
Product Details
This Exhaust Bellows Expander Tool simplifies the installation of exhaust bellows on a wide range of MerCruiser stern drives. It is specifically designed for MC-I, R-MR, Alpha One (Gen 1 & Gen 2), Bravo (1, 2, & 3), and Blackhawk drive units, ensuring a proper fit and seal.
It serves as a direct interchange for Mercury/MerCruiser 91-45497A1 and 8M0096108, as well as aftermarket equivalents Sierra 18-9847, GLM 90360, and Mallory 9-79811.
- Features a scissor handle design for effective manual operation.
- Opens with a screw lock mechanism for precise control during installation.
- Constructed from durable steel with vinyl-gripped alloy steel handles for longevity.
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 | 9-79811 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Notes |
|---|---|---|
| Mercury | MC-1 | For exhaust bellows installation |
| Mercury | R-MR | For exhaust bellows installation |
| Mercury | Alpha One (Gen 1) | For exhaust bellows installation |
| Mercury | Alpha One Gen 2 | For exhaust bellows installation |
| Mercury | Bravo One | For exhaust bellows installation |
| Mercury | Bravo Two | For exhaust bellows installation |
| Mercury | Bravo Three | For exhaust bellows installation |
| Mercury | Blackhawk | For exhaust bellows installation |
Technical Specs
- Product Type
- Exhaust Bellows Installation Tool
- Installation
- Manual operation with scissor handle design
- Housing Material
- Steel
- Handle Material
- Alloy Steel with Vinyl Grip
- Tool Color
- Black
- Weight
- 0.6 kg (1.32 lbs)
- Warranty
- 180 days (HeuroFosh brand)
- Other Technical Attributes
- Opens with screw lock mechanism
What’s in the Box
- 1 x Exhaust Bellows Expander Tool (Replaces 91-45497A1/8M0096108)
Installation Notes
- Place the clamp over the end of the bellows.
- Insert the expander tool into the first convolution of the bellow.
- Pull the tool handle until the bellow touches the flange on the bell housing, then release the tool.
- Reposition the tool into the third convolution of the bellow.
- Pull the bellows fully onto the bell housing flange, then insert the straight rod and 'U' pin into the tool to secure it.
Note: The sterndrive unit must be removed from the vessel to use this tool correctly.
Troubleshooting & FAQ
What specific MerCruiser drives is this tool compatible with?
This expander tool is designed for a broad range of MerCruiser stern drives, including MC-I, R-MR, Alpha One (Gen 1), Alpha One (Gen 2), Bravo One, Bravo Two, Bravo Three, and Blackhawk models.
Do I have to remove the sterndrive to use this tool?
Yes, the sterndrive must be removed from the boat to access the exhaust bellows and properly use this installation tool.
What are the signs that my exhaust bellows need to be replaced?
Common signs of a failing exhaust bellow include visible cracks or splits, water leaking into the bilge area, or unusual exhaust noise. Regular inspection during maintenance is the best way to catch wear early.
How often should I inspect or replace the exhaust bellows?
As a general guideline, marine exhaust bellows should be inspected annually for any signs of wear, cracking, or deterioration. Replacement intervals can vary based on usage (freshwater vs. saltwater) and storage conditions, but they are typically replaced every 3-5 years or as needed.
How does the screw lock mechanism work?
The screw lock mechanism allows you to open the tool to a specific width and lock it in place. This provides precise, steady expansion of the bellows, making it easier to guide onto the bell housing flange without slipping.
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.
