78458A1 Mercury MerCruiser Bellows Kit | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Exhaust Tube Assembly - Part Number: 78458A1

Genuine Quicksilver/MerCruiser exhaust tube assembly for MerCruiser Bravo stern drive applications. Although commonly described as a bellows-style exhaust service part, this component is the exhaust tube assembly used in place of the full exhaust bellows on compatible Bravo I, Bravo II and Bravo III drive installations.

⚙️ Key Features

• Genuine Quicksilver/MerCruiser OEM exhaust tube assembly

• Used on compatible Bravo stern drive exhaust outlets

• Direct replacement for 78458 and 78458A1 references

• Helps direct exhaust discharge through the drive area

• Easier service-style exhaust tube design compared with full bellows installation

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 78458A1 → Supersedes 78458

• 78458 earlier OEM reference

OEM / Related Numbers:

• 78458A1

• 78458

• 78458A 1

• Exhaust tube assembly

• Exhaust tube bellows replacement reference

Aftermarket / Verified Equivalents:

• Sierra: 18-2756

• GLM: 89180

• CEF: exhaust tube bellows equivalent

• REC: REC78458A1

🚤 Compatibility

Commonly used on:

• MerCruiser Bravo stern drive exhaust tube applications

• MerCruiser Bravo I, Bravo II and Bravo III exhaust outlet service

• MerCruiser Alpha / Bravo-style exhaust service where 78458A1 is specified by parts diagram

Typically suits:

• Engine models:

• MerCruiser Bravo One stern drives

• MerCruiser Bravo Two stern drives

• MerCruiser Bravo Three stern drives

• MerCruiser Bravo transom assemblies using exhaust tube 78458A1

• MerCruiser stern drive applications where the exhaust tube assembly is specified instead of full exhaust bellows

• HP Range: Not applicable - stern drive exhaust tube component

• Engine Type: MerCruiser Bravo stern drive exhaust outlet system

• Year Range: Application dependent by Bravo drive model, transom assembly and parts diagram

🔌 Function

The exhaust tube helps direct exhaust gases and cooling water discharge through the stern drive exhaust outlet area. It provides a shorter open exhaust connection compared with a fully sealed exhaust bellows arrangement and is commonly used on Bravo drive service applications.

Common signs of failure:

• Cracked, split or hardened exhaust tube

• Exhaust noise increase around the transom area

• Exhaust discharge not directed correctly

• Tube slipping from the mounting lip

• Damage found during transom or bellows service

• Rubber deterioration from heat and age

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging