Volvo Penta 3847640 Water-Cooled Exhaust Manifold (SKU: 3847640)
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Volvo Penta 3847640 Water-Cooled Exhaust Manifold – OEM Replacement for AQ/BB Series Inboard & Sterndrive Engines
The exhaust manifold is one of the hardest-working components in your Volvo Penta inboard — channelling hot combustion gases away from the engine while raw water cooling keeps temperatures in check. When corrosion, cracking, or coolant leaks signal it's time for a replacement, there's no substitute for the genuine article. The Volvo Penta 3847640 (SKU: 3847640) is an OEM water-cooled exhaust manifold engineered to exact factory specifications for select AQ and BB series petrol engines. This is the replacement for part number 3860855
Fitted correctly, this manifold restores proper exhaust flow and thermal management, protecting your engine from the heat stress and water ingestion that a compromised manifold can cause. Whether you're completing a full engine overhaul or replacing a single failed component, this is the part that does it right the first time.
Key Features
- Genuine Volvo Penta OEM part — part number 3847640
- Water-cooled cast iron construction for durability in marine environments
- Engineered to OEM fit, form, and function — direct bolt-on replacement
- Restores correct exhaust gas flow and engine thermal management
- Compatible with select Volvo Penta AQ and BB series inboard/sterndrive petrol engines
Compatibility
- Volvo Penta AQ125, AQ145, AQ170 series
- Volvo Penta BB115, BB145 series
- Confirm fitment against your engine serial number and parts diagram before ordering
Installation Notes
- Always replace exhaust manifold gaskets when fitting a new manifold
- Inspect the elbow/riser and raw water cooling passages for corrosion before reassembly
- Torque all fasteners to Volvo Penta specification
- Pressure-test the cooling circuit after installation before returning the vessel to service
Part Numbers
- Volvo Penta OEM Part Number: 3847640
- SKU: 3847640
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.