Exhaust Bellows Expander Tool – Fits MerCruiser Alpha One & Bravo Series (Replaces 91-45497A1, 8M0096108)
Exhaust Bellows Expander Tool – Fits MerCruiser Alpha One & Bravo Series (Replaces 91-45497A1, 8M0096108) 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).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Bellows Expander Tool – Fits MerCruiser Alpha One & Bra...
Product Details
This specialized Exhaust Bellows Expander Tool is engineered to simplify the installation of exhaust bellows on a wide range of MerCruiser stern drives. It is designed for use with Alpha One (Gen I & II) and Bravo (1, 2, & 3) series models manufactured from 1980 to the present, ensuring proper stretching and seating of the bellows inside the bell housing.
It serves as a direct replacement for Mercury/MerCruiser 91-45497A1, 91-8M0096108, and 8M0096108, as well as aftermarket parts Sierra 18-9847, GLM 90360, and Mallory 79811.
- Features a scissor-style design for manual operation.
- Constructed from durable steel for long-term service.
- Equipped with a non-slip PVC-covered handle for a secure grip.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury / MerCruiser | 91-45497A1 |
| Mercury / MerCruiser | 91-8M0096108 |
| 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 a variety of MerCruiser stern drive models. Please check your serial number for exact fitment where noted.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | Alpha One | Various | 4-Stroke | 1980–Current | 91-45497A1 | |
| MerCruiser | Alpha One Gen II | Various | 4-Stroke | 1998–Current | 91-45497A1 | Specific for 0L100040 and up |
| MerCruiser | Bravo One | Various | 4-Stroke | 1988–Current | 91-45497A1 | All serial numbers |
| MerCruiser | Bravo Two | Various | 4-Stroke | 1988–Current | 91-45497A1 | All serial numbers |
| MerCruiser | Bravo Three | Various | 4-Stroke | 1988–Current | 91-45497A1 | All serial numbers |
| MerCruiser | Bravo XR One | Various | 4-Stroke | 1998–2009 | 91-45497A1 | Serial 0L914990 to current |
| MerCruiser | Bravo XR Sportmaster | Various | 4-Stroke | 1998–2009 | 91-45497A1 | Serial 0M052945 and up |
| MerCruiser | Blackhawk | Various | 4-Stroke | All Years | 91-45497A1 | |
| MerCruiser | MC-1 | Various | 4-Stroke | All Years | 91-45497A1 | |
| MerCruiser | R-MR | Various | 4-Stroke | All Years | 91-45497A1 |
Technical Specs
- Product Type
- Exhaust Bellows Installation Tool
- Installation
- Manual operation
- Material
- Steel
- Handle
- PVC-covered (non-slip)
- Design
- Scissor-style with tong-like grip
- Compatible With
- MerCruiser Alpha One, Alpha Gen II, Bravo 1, 2, 3, Blackhawk, MC-1, R-MR stern drives
- Usage Note
- Stern drive must be removed for proper use
- Housing Color
- Black/Metal
- Weight
- ~0.63 kg (1.38 lb)
- Country of Manufacture
- USA (for MBS brand)
What’s in the Box
- 1 x Exhaust Bellows Expander Tool (Replaces 91-45497A1)
Installation Notes
- First, install the new exhaust bellows onto the gimbal housing.
- Insert the tool into the bell housing and use it to grab and stretch the exhaust bellows through the exhaust hole.
- Once the bellows is properly seated, securely tighten the hose clamp.
- Note: For correct and safe installation, the stern drive unit must be completely removed from the vessel.
Troubleshooting & FAQ
Which MerCruiser drives is this tool for?
This tool is designed for a wide range of MerCruiser stern drives, including the Alpha One (Generations I & II), Bravo Series (One, Two, Three, XR One, XR Sportmaster), Blackhawk, MC-1, and R-MR models from 1980 to current.
Do I have to remove the stern drive to use this tool?
Yes, the stern drive must be removed to access the exhaust bellows and use this tool correctly. It is not possible to perform the installation with the drive in place.
What is the advantage of this tool's design?
The scissor-style mechanism provides the leverage needed to stretch the new, stiff bellows into position, which is difficult to do by hand. The tong-like grip ensures a firm hold on the bellows for precise placement.
Is this tool made of plastic or metal?
The tool is constructed from durable steel to withstand the force required for installation, with a PVC-coated handle for a comfortable, non-slip grip.
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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