Exhaust Bellows Expander Tool – Fits MerCruiser Alpha One, Gen II, Bravo Series (Replaces 91-45497A1, 8M0096108)
Exhaust Bellows Expander Tool – Fits MerCruiser Alpha One, Gen II, Bravo Series (Replaces 91-45497A1, 8M0096108) 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.
Exhaust Bellows Expander Tool – Fits MerCruiser Alpha One, Gen II, ...
Exhaust Bellows Expander Tool – Fits MerCruiser Alpha One, Gen II, Bravo Series (Replaces 91-45497A1, 8M0096108) is backordered and will ship as soon as it is back in stock.
Product Details
This Exhaust Bellows Expander Tool – Fits MerCruiser Alpha One, Gen II, Bravo Series (Replaces 91-45497A1, 8M0096108) is designed for stretching and installing exhaust bellows on a wide range of MerCruiser sterndrive units. It is compatible with Alpha One, Alpha One Generation 2, Bravo One, Bravo Two, Bravo Three, Blackhawk, MC-1, R, and MR drive units from 1983 and newer.
This tool directly replaces Mercury part numbers 91-45497A1 and 8M0096108, as well as aftermarket equivalents like Sierra 18-9847 and GLM 90360.
- Features a scissor-handle with a screw lock mechanism for manual operation.
- Constructed from high-quality steel for durability.
- Note: The Z-drive must be removed from the bell housing to use this tool correctly.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 91-45497A1 |
| Mercury | 8M0096108 |
| Sierra | 18-9847 |
| GLM | 90360 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This tool is designed for use on various MerCruiser sterndrive models as detailed in the matrix.
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| MerCruiser | Alpha One | 1983–1990 | 91-45497A1 | First Generation |
| MerCruiser | Alpha One Gen II | 1991 and up | 91-45497A1/8M0096108 | |
| MerCruiser | Bravo One | 1996–2013 | 91-45497A1/8M0096108 | |
| MerCruiser | Bravo Two | 1996–2013 | 91-45497A1/8M0096108 | |
| MerCruiser | Bravo Three | 1996–2013 | 91-45497A1/8M0096108 | |
| MerCruiser | MC-1 | 1998–2009 | 91-45497A1/8M0096108 | Integrated rear drive |
| MerCruiser | R | Various | 91-45497A1/8M0096108 | |
| MerCruiser | MR | Various | 91-45497A1/8M0096108 | |
| MerCruiser | Blackhawk | Various | 91-45497A1/8M0096108 |
Technical Specs
- Product Type
- Exhaust Bellows Installation Tool
- Installation
- Manual Operation
- Material
- High-quality Steel
- Handle Material
- Steel with PVC Grip Cover
- Design
- Scissor-handle with Screw Lock Mechanism
- Handle Style
- Pliers-like with Non-slip Grip
- Mechanism
- Mechanical Expansion/Compression
- Required Installation
- Z-drive Must Be Removed to Use Tool
What’s in the Box
- 1 x Exhaust Bellows Expander Tool (91-45497A1/8M0096108)
Installation Notes
- Install the exhaust bellows on the gimbal housing.
- Use the tool to stretch the bellows through the exhaust hole in the bell housing.
- Tighten the hose clamp securely.
- Note: The Z-drive must be removed to use this tool.
Troubleshooting & FAQ
Which MerCruiser drives is this tool compatible with?
This tool fits MerCruiser Alpha One (including Gen II), Bravo (One, Two, Three), Blackhawk, MC-1, R, and MR sterndrive units manufactured from 1983 onwards.
Is it necessary to remove the sterndrive to use this tool?
Yes, the Z-drive must be removed from the bell housing before you can use this tool to install the exhaust bellows.
What OEM part numbers does this tool replace?
This aftermarket tool is a direct replacement for Mercury OEM part numbers 91-45497A1 and 8M0096108. It also cross-references to Sierra 18-9847 and GLM 90360.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, with batch inspections for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free, and expedited options may appear at checkout where available.
Warranty & returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchasing. If anything differs, do not purchase, even if your model is listed as compatible.
- This is an aftermarket replacement part, not an OEM component.
- Professional installation is highly recommended for safety and optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — Our direct-sourcing model ensures fair pricing without compromising on materials or quality control.
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.
