3-Inch Exhaust Bellow for MerCruiser Wet-Joint Exhaust Systems – Replaces 70981A3, 32-90949T
3-Inch Exhaust Bellow for MerCruiser Wet-Joint Exhaust Systems – Replaces 70981A3, 32-90949T is backordered and will ship as soon as it is back in stock.
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3-Inch Exhaust Bellow for MerCruiser Wet-Joint Exhaust Systems – Re...
3-Inch Exhaust Bellow for MerCruiser Wet-Joint Exhaust Systems – Replaces 70981A3, 32-90949T is backordered and will ship as soon as it is back in stock.
Product Details
This 3-inch exhaust bellow is an aftermarket replacement for selected MerCruiser wet-joint exhaust applications. It is used in the exhaust manifold and elbow area where a flexible rubber bellow is required. Catalog references identify this style as a 3-inch exhaust bellow associated with MerCruiser reference numbers 70981A3 and 32-90949T.
Fitment depends on the exact exhaust-manifold, elbow, and riser configuration. Confirm the original bellow dimensions, connection style, engine model, serial range, and exhaust arrangement before ordering. The references below are manufacturer or aftermarket part numbers and are not a substitute for application-specific verification.
- 3-inch exhaust bellow for compatible wet-joint exhaust systems.
- Flexible rubber construction for the manifold-to-elbow exhaust connection.
- Designed as a replacement component for applications using the listed reference numbers.
- Sold as one bellow; clamps and other exhaust hardware are not included unless specifically stated in the order details.
Part Number Matrix
Use these references to compare the replacement with the part removed from your engine.
| Brand or Catalog | Part Number | Reference Type |
|---|---|---|
| Mercury Marine / MerCruiser | 70981A3 | OEM reference |
| Mercury Marine / MerCruiser | 32-90949T | OEM reference |
| Mercury Marine / MerCruiser | 70981 | Earlier reference shown in aftermarket catalog cross-reference data |
| Sierra | 18-2762 | Aftermarket cross-reference for 70981A3 |
| GLM | 89070 | Aftermarket cross-reference supplied in the original listing |
| Mallory | 9-72808 | Aftermarket cross-reference supplied in the original listing |
Engine and Application Compatibility
This bellow is intended only for engines and exhaust assemblies that use the corresponding 3-inch wet-joint bellow. A general engine-family description alone is not sufficient to confirm fitment because manifold, elbow, riser, and serial-range configurations can vary.
| Check Before Ordering | What to Confirm |
|---|---|
| Engine brand and model | Confirm the complete MerCruiser engine designation and serial range. |
| Exhaust system type | Confirm that the engine uses a compatible wet-joint exhaust arrangement. |
| Bellow size | Confirm the 3-inch connection size and compare both ends with the original part. |
| Manifold and elbow configuration | Verify the manifold, riser, and elbow arrangement; a similar engine model may use a different exhaust bellow. |
| Reference numbers | Compare the removed part with 70981A3, 32-90949T, or another verified equivalent reference. |
Technical Specifications
- Product Type
- Exhaust bellow
- Nominal Size
- 3 inches
- Application
- Compatible wet-joint exhaust manifold and elbow assemblies
- Material
- Flexible rubber construction
- Connection
- Slip-on bellow connection secured with hose clamps where required by the engine assembly
- Color
- Black
- Reference Numbers
- 70981A3 and 32-90949T; verify the application before purchase
What's in the Box
- 1 x 3-inch exhaust bellow
Hose clamps, gaskets, elbows, risers, manifolds, and other installation hardware are not included unless specifically listed with the order.
Installation Notes
- Turn off the engine, allow it to cool completely, and disconnect the battery according to the vessel manufacturer's safety procedure.
- Confirm that the replacement bellow matches the original part in size, length, and connection arrangement before removing the old component.
- Remove the components or clamps required to access the existing bellow.
- Inspect the manifold, elbow, riser, and sealing surfaces for corrosion, cracking, distortion, or debris.
- Clean the mating surfaces and install the new bellow without twisting, stretching, or sharply folding the rubber.
- Position the hose clamps in the original locations and tighten them to the engine or clamp manufacturer's specification. Do not overtighten.
- After reassembly, run the engine in a safe, well-ventilated setting and inspect carefully for exhaust, water, or cooling-system leaks.
Troubleshooting and FAQ
How do I confirm that this bellow fits my engine?
Compare the original part with the listed 3-inch size and reference numbers, then verify the complete engine model, serial range, manifold, elbow, and riser configuration. If any of these details differ, consult the relevant service or parts catalog before ordering.
Is this bellow for a wet-joint or dry-joint exhaust system?
The listed application is for compatible wet-joint exhaust arrangements. Do not assume that a newer or differently configured dry-joint system uses this bellow simply because the engine horsepower or displacement appears similar.
Are clamps included?
No. This listing is for one exhaust bellow. Reuseable clamps may be retained only if they are in serviceable condition and approved for reuse; replacement clamps should be purchased separately when required.
What are the signs of a worn exhaust bellow?
Inspect for cracks, hardening, splitting, abrasion, deformation, water staining, exhaust odor, or leakage around the manifold and elbow connection. Replace the bellow if damage or loss of sealing is found.
Is this an OEM part?
This listing is for an aftermarket replacement bellow. The OEM reference numbers are provided only to help compare the application and should not be interpreted as a claim that the replacement is manufactured by Mercury Marine.
Does the product include a warranty?
Warranty coverage, if applicable, is subject to the seller's current warranty terms. Review the applicable terms before installation and retain your order information.
Safety and Important Information
- Verify the exact engine model, serial range, exhaust configuration, dimensions, and reference number before purchase.
- Do not operate an engine with a damaged or leaking exhaust bellow.
- Exhaust work can involve hot surfaces, cooling water, fumes, and confined engine-compartment hazards. Professional installation is recommended when the application is not fully identified.
- This is an aftermarket replacement component and is not an OEM Mercury Marine part.
About Sea Sierra
- Marine Replacement Parts — We provide replacement components for a range of marine service applications.
- Application-Focused Listings — Reference numbers and installation information are provided to help customers compare replacement parts.
- Support for Fitment Questions — When fitment is uncertain, provide the complete engine model, serial information, and photos or measurements of the original part before ordering.
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