Upper Exhaust Bellow – Fits MerCruiser 3.0L-5.7L V6/V8 (Replaces 70981A3)
Upper Exhaust Bellow – Fits MerCruiser 3.0L-5.7L V6/V8 (Replaces 70981A3) 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
Upper Exhaust Bellow – Fits MerCruiser 3.0L-5.7L V6/V8 (Replaces 70...
Product Details
This Upper Exhaust Bellow is a crucial component for MerCruiser stern drive engines, connecting the 3-inch center mounted riser to the 4-inch elbow. It fits a wide range of models, including V6 229/262 (1983 and up), V8 Chevy 305/350/377 (1983 and up), and V8 Big Block 454/502 (1981 and up) engines.
This part is a direct replacement for multiple OEM and aftermarket numbers, including Mercury MerCruiser 70981A3, 70981B3, and 70981, as well as Sierra 18-2762, Mallory Marine 9-72808, and GLM 89070.
- Designed for direct-fit installation with included clamps.
- Constructed from high-grade CR (Chloroprene Rubber) for durability in marine environments.
- Functions as a Y-pipe joint bellow within the exhaust system.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury MerCruiser | 70981A3 |
| Mercury MerCruiser | 70981B3 |
| Mercury MerCruiser | 70981 |
| Sierra | 18-2762 |
| Mallory Marine | 9-72808 |
| GLM | 89070 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This exhaust bellow is compatible with a wide range of gasoline MerCruiser stern drive engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 120 HP | 120 | 4-Stroke | 1983–1986 | 70981A3 | GM 153 I/L4 |
| MerCruiser | 140 HP | 140 | 4-Stroke | 1982–1986 | 70981A3 | GM 181 I/L4 |
| MerCruiser | 180 | 180 | 4-Stroke | 1987 | 70981A3 | Mercury 224 I/L4 (4 BBL.) |
| MerCruiser | 185R/MR | 185 | 4-Stroke | 1983–1984 | 70981A3 | GM 229 V-6 (4 BBL.) |
| MerCruiser | 185/205 HP | 185 | 4-Stroke | 1985–1987 | 70981A3 | GM 262 V-6 (2 BBL.) |
| MerCruiser | 200 | 200 | 4-Stroke | 1985–1986 | 70981A3 | GM 305 V-8 (2 BBL.) |
| MerCruiser | 200 | 200 | 4-Stroke | 1987 | 70981A3 | GM 305 V-8 (2 BBL.) |
| MerCruiser | 260 | 260 | 4-Stroke | 1982–1986 | 70981A3 | GM 305 V-8 (4 BBL.) |
| MerCruiser | 260 | 260 | 4-Stroke | 1978–1982 | 70981A3 | GM 350 V-8 (4 BBL.) |
| MerCruiser | 260 | 260 | 4-Stroke | 1987 | 70981A3 | GM 350 V-8 |
| MerCruiser | 330 | 330 | 4-Stroke | 1982–1987 | 70981A3 | GM 454 V-8 w/Borg Warner |
Technical Specs
- Product Type
- Upper Exhaust Bellow
- Installation
- Direct fit with clamps
- Connection
- 3-inch center mounted riser to 4-inch elbow
- Housing Material
- CR (Chloroprene Rubber)
- Housing Color
- Black
- Fitting Type
- Hose connection with clamps
- Warranty
- Varies by manufacturer (typical 1 year)
- Other Technical Attributes
- Y-pipe joint bellow for exhaust system
What’s in the Box
- 1 x Upper Exhaust Rubber Bellow (Replaces 70981A3)
- 2 x Stainless Steel Clamps
Installation Notes
- Disconnect the battery for safety.
- Gain clear access to the stern drive's exhaust Y-pipe and riser connection.
- Loosen and remove the clamps securing the old bellow.
- Carefully detach the old, damaged bellow, noting its orientation.
- Thoroughly clean the mating surfaces on the riser and Y-pipe to ensure a good seal.
- Position the new exhaust bellow, ensuring it is properly seated on both ends.
- Install and securely tighten the new stainless steel clamps. Do not overtighten.
- Reconnect the battery.
- Run the engine on the water or with a proper water supply and check for any exhaust or water leaks around the new bellow.
Troubleshooting & FAQ
How do I confirm if this exhaust bellow will fit my engine?
The surest way is to match your existing part number to one in our Part Number Matrix. You can also review the Engine & Model Compatibility table, but always visually compare your old part to our product photos before ordering.
What are common signs that my exhaust bellow has failed?
Symptoms of a failed bellow include water leaking into the bilge, a noticeable smell of exhaust fumes in or around the engine bay, excessive engine noise, or potential overheating issues.
How often should I inspect or replace my exhaust bellow?
For preventative maintenance, we recommend inspection at every service interval. Replacement is advised every 1–2 years for boats in saltwater and every 3–5 years for freshwater use, or immediately if you notice any cracks, splits, or leaks.
What makes CR (Chloroprene) rubber suitable for this part?
Chloroprene Rubber (CR) is a synthetic rubber valued for its excellent resistance to heat, ozone, weathering, and saltwater corrosion, making it a durable choice for demanding marine exhaust applications.
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
GEOCovered 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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