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Description
78458A1 Exhaust Tube Bellow for MerCruiser | JLM MarineExhaust Tube Bellow for MerCruiser Fits Alpha One, Bravo & Blackhawk Drives This exhaust tube bellow is engineered to meet or exceed OEM specifications for MerCruiser stern drive applications. Designed for R MR Alpha One (Serial No. 6225577 & UP, 1983 1990), Bravo I, II, III (Serial No. OB664190 & UP, 1988 and later), and Blackhawk (Serial No. 0F18677 & UP, 1994 1995) drives, this bellow ensures reliable exhaust routing and protection in demanding
Exhaust Tube Bellow for MerCruiser – Fits Alpha One, Bravo & Blackhawk Drives
This exhaust tube bellow is engineered to meet or exceed OEM specifications for MerCruiser stern drive applications. Designed for R/MR/Alpha One (Serial No. 6225577 & UP, 1983-1990), Bravo I, II, III (Serial No. OB664190 & UP, 1988 and later), and Blackhawk (Serial No. 0F18677 & UP, 1994-1995) drives, this bellow ensures reliable exhaust routing and protection in demanding marine environments.
Direct Replacements: 78458A1, 18-2760, 9-72810, 89150
- Comes complete with stainless steel clamp as shown
- Built to OEM dimensions for precise fitment
- Suitable for long-term durability in saltwater and freshwater applications
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| MerCruiser | 78458A1 |
| Sierra | 18-2760 |
| Mallory | 9-72810 |
| Aftermarket | 89150 |
Compatible Engine Models
Confirm your engine model/year in the table below.
| Brand | Model | Serial Number / Year | Notes |
|---|---|---|---|
| MerCruiser | R/MR/Alpha One | Serial No. 6225577 & UP (1983-1990) | Exhaust Bellow #1 |
| MerCruiser | Bravo I, II, III | Serial No. OB664190 & UP (1988 and later) | Exhaust Bellow #1 |
| MerCruiser | Blackhawk | Serial No. 0F18677 & UP (1994-1995) | Exhaust Bellow #1 |
Technical Specifications
| Specification | Value |
|---|---|
| OEM Number | 78458A1 |
| Application | MerCruiser Stern Drives |
| Bellow Type | Exhaust Tube Bellow #1 |
| Material | Marine-grade rubber |
| Included Hardware | Stainless steel clamp |
Package Contents
- 1 × Exhaust Tube Bellow (exactly as shown)
- 1 × Stainless Steel Clamp
Installation Guide
- Disconnect the battery and raise the stern drive to access the bellows assembly.
- Remove the old exhaust bellow by loosening and removing the stainless clamps at both ends.
- Inspect the exhaust tube and mounting surfaces for cracks, corrosion, or damage; clean thoroughly.
- Slide the new bellow onto the exhaust tube, ensuring it seats fully on both the gimbal housing and drive unit connections.
- Position the stainless clamps over the bellow ends and tighten securely using a screwdriver or socket wrench.
- Verify that the bellow is not twisted or kinked and that clamps are snug but not over-tightened.
- Lower the drive unit and reconnect the battery. Run the engine briefly and check for exhaust leaks around the bellow.
- Re-inspect clamp tightness after the first few hours of operation.
Troubleshooting & FAQ
Q: How do I confirm this fits my MerCruiser drive?
A: Check your stern drive's serial number plate. This bellow fits R/MR/Alpha One (Serial 6225577 & up, 1983-1990), Bravo I/II/III (Serial OB664190 & up, 1988+), and Blackhawk (Serial 0F18677 & up, 1994-1995). Compare the images with your original part to ensure a match.
Q: How often should I replace the exhaust bellow?
A: Inspect bellows annually for cracks, tears, or hardening. Replace every 3–5 years or immediately if you notice exhaust leaks, water intrusion, or visible damage.
Q: What are signs the exhaust bellow is failing?
A: Common symptoms include visible cracks or splits in the rubber, water in the bilge near the stern drive, exhaust fumes in the engine compartment, or a burning smell during operation.
Q: Does this come with installation hardware?
A: Yes, the bellow includes one stainless steel clamp as shown in the product images. You may need additional clamps depending on your drive configuration; refer to your service manual.
Q: Is this an OEM MerCruiser part or aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy