Upper Exhaust Bellows Kit – Fits Mercury/Mercruiser V6 & V8 4.3L-7.4L (Replaces 32-44348T, 32-44348001)

$48.99

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Upper Exhaust Bellows Kit – Fits Mercury/Mercruiser V6 & V8 4.3L-7.4L (Replaces 32-44348T, 32-44348001) is backordered and will ship as soon as it is back in stock.

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

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This Upper Exhaust Bellows Kit is designed for Mercruiser V6 and V8 sterndrive engines with a center-mounted riser system manufactured between 1987 and 2003. It provides a direct-fit replacement for models including the 4.3L, 5.0L, 5.7L, and 7.4L series, ensuring a reliable seal between the exhaust riser and elbow.

This kit serves as a direct replacement for Mercury/Mercruiser parts 32-44348T and 32-44348001, as well as aftermarket equivalents from Sierra Marine (18-2748), GLM Marine (89120), and Mallory Marine (9-72805).

Connects the center-mounted riser to the exhaust elbow.
Constructed from a high-grade marine rubber compound for durability.
Includes two marine-grade stainless steel hose clamps for a complete installation.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number	Superseded By
Mercury/Mercruiser	32-44348001	32-44348T
Mercury/Mercruiser	32-44348T
Sierra Marine	18-2748
GLM Marine	89120
Mallory Marine	9-72805

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Mercruiser models, this kit is compatible with a wide range of V6 and V8 sterndrive engines, including Alpha One and Bravo series, that utilize a center-mounted exhaust riser.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercruiser	MCM 120	120 HP	4-Stroke	1987–2002	32-44348001	Center-mounted riser
Mercruiser	MCM 140	140 HP	4-Stroke	1987–2002	32-44348001	Center-mounted riser
Mercruiser	4.3L V6	175–220 HP	4-Stroke	1987–2003	32-44348T	Alpha/Bravo compatible
Mercruiser	5.0L V8	230–260 HP	4-Stroke	1987–2003	32-44348T	Small block Chevy
Mercruiser	5.7L V8	250–350 HP	4-Stroke	1987–2003	32-44348T	Small block Chevy
Mercruiser	7.4L V8	330–454 HP	4-Stroke	1988–2001	32-44348T	Big block Chevy
Mercruiser	Alpha One Gen I	Various	4-Stroke	1983–1990	32-44348001	Sterndrive unit
Mercruiser	Alpha One Gen II	Various	4-Stroke	1991–2003	32-44348T	Sterndrive unit
Mercruiser	Bravo I	Various	4-Stroke	1988–2003	32-44348T	Sterndrive unit
Mercruiser	Bravo II	Various	4-Stroke	1988–2003	32-44348T	Sterndrive unit
Mercruiser	Bravo III	Various	4-Stroke	1988–2003	32-44348T	Sterndrive unit

Technical Specs

Product Type: Upper Exhaust Bellows Kit
Installation: Center-mounted riser to exhaust elbow connection
Housing Material: High-grade marine rubber compound
Housing Color: Black
Dimensions: 4" Inside Diameter × 4.25" Length (101.6mm × 108mm)
Box Dimensions: 13.5cm x 24cm x 16cm
Weight: 0.39 kg (0.86 lb)
Fitting Type: Flexible bellows with hose clamp attachment
Operating Temperature: -40°C to 93°C (-40°F to 200°F)
Warranty: 1 Year Limited (for aftermarket replacements)
Other Attributes: OEM Quality Replacement, includes stainless steel clamps

What’s in the Box

2 x Upper Exhaust Bellows (Replaces 32-44348T)
4 x Stainless Steel Hose Clamps (Marine Grade)

Installation Notes

Ensure the engine is completely cool and disconnect the boat’s battery for safety.
Gain clear access to the rear of the engine where the exhaust system is located.
Locate the existing upper exhaust bellows connecting the exhaust riser to the Y-pipe or elbow.
Use a socket or screwdriver to loosen the hose clamps at both ends of the old bellows.
Carefully remove the old bellows. You may need to gently pry it off if it has adhered to the fittings.
Thoroughly clean the surfaces of the riser and elbow, removing any old rubber or sealant residue.
Slide the new bellows into position, ensuring it is properly seated on both fittings.
Place the new stainless steel clamps over each end of the bellows.
Adjust the bellows to ensure it is straight and not twisted, then securely tighten both clamps. Do not overtighten.
Reconnect the battery, start the engine, and carefully check for any exhaust or water leaks around the new installation.

Troubleshooting & FAQ

How do I confirm this bellows kit fits my specific engine?

This kit is designed for Mercruiser V6 and V8 engines (1987–2003) using a center-mounted riser system. Please consult the Engine & Model Compatibility table on this page and cross-reference your engine model and year. Verifying the part number (32-44348T or 32-44348001) is the most reliable method.

What are the signs that my current exhaust bellows is failing?

Common symptoms of a failing bellows include visible cracks or splits in the rubber, water leaking into the bilge from the exhaust area, an unusually loud engine noise, or the distinct smell of exhaust fumes within the engine compartment.

How often should I inspect or replace my exhaust bellows?

It is best practice to visually inspect your exhaust bellows at least once a year. Look for signs of cracking, dry rot, or brittleness. As a preventative measure, consider replacement every 3-5 years, depending on usage and operating conditions (especially in saltwater).

Is any special sealant needed for this installation?

No, sealant is generally not required or recommended. A secure, leak-free fit is achieved by ensuring the mounting surfaces are clean and by properly tightening the included marine-grade hose clamps.

What is the difference between an upper and lower exhaust bellows?

This upper bellows connects the exhaust riser to the Y-pipe. The lower exhaust bellows (a different part) connects the Y-pipe to the transom exhaust outlet. They are not interchangeable. This kit is only for the upper position on specific Mercruiser models.

OEM vs. Aftermarket? Which is better?

This listing is an aftermarket replacement (not OEM). It has been engineered to meet or exceed OEM-level specifications using comparable high-quality materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality and consistency, offering you professional-grade performance at a better value.

How fast do you ship and what does it cost?

We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most locations. Expedited shipping options and exact costs are presented at checkout where available for your address.

What is your warranty and return policy?

This part is covered by a 1-year limited warranty against manufacturing defects under normal marine use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for unused parts in their original condition. See our full 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.

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