Volvo Penta Exhaust Manifold 3847501 – 5.0L 5.7L GM V8 Center-Riser

Volvo Penta 3847501 – Exhaust Manifold

Part Number: 3847501
Brand: Volvo Penta
Type: Exhaust Manifold (OEM)
System: Exhaust – Center-Riser Configuration
Engine Family: GM Small Block V8 – 5.0L and 5.7L
Approximate Weight: 15.9 kg (approx. 35 lb)
Includes: Drain plug assembly and 90-degree hose connector (gaskets not included)

The Volvo Penta 3847501 is a genuine OEM exhaust manifold for GM-based small block V8 marine engines using a center-riser exhaust layout. This manifold replaces earlier Volvo Penta and OMC numbers in the same center-riser family.

Compatible Applications

• 5.0GL
• 5.0Gi
• 5.0GXi
• 5.0OSi
• 5.7GL
• 5.7Gi
• 5.7GXi
• 5.7OSXi

Center-riser and other manifold styles can look similar but are not interchangeable. Always confirm fitment using your exact engine model designation, serial number, and exhaust layout against the applicable Volvo Penta parts diagram before ordering.

Serial Number Fitment Notice

Fitment can vary by engine family, exhaust-riser style, and serial number range. Confirm part number 3847501 against your engine serial number and the correct exhaust diagram before ordering. Do not order by engine displacement alone.

Superseded / Related Part Numbers

• 3847501 – current OEM ordering number
• 914035 – superseded
• 913582 – superseded
• 3852374 – superseded
• 3857723 – superseded

When to Replace

• Cracks or warping in the manifold casting
• Internal corrosion or coolant-passage blockage
• Exhaust or cooling-water leaks at the manifold sealing surfaces
• Repeated manifold gasket failures pointing to a damaged casting
• Exhaust-riser service that reveals manifold deterioration

Installation Notes

Confirm the center-riser exhaust layout on your specific engine before ordering. Gaskets are not included — inspect and replace all manifold gaskets during installation. The included drain plug assembly and 90-degree hose connector should be transferred or replaced as needed. Torque all fasteners to the Volvo Penta service manual specification.

Service Interval

Exhaust manifolds on freshwater-cooled marine engines should be inspected at every major service interval for internal corrosion, cracking, and sealing-surface condition. Saltwater-cooled applications typically require more frequent inspection due to accelerated corrosion inside the cooling passages.

Technical FAQ

Q: Is this a port-riser or center-riser manifold?
A: 3847501 is a center-riser manifold. The riser mounts at the center of the manifold rather than at one end. Confirm your existing riser position before ordering.

Q: Are gaskets included?
A: No. Manifold gaskets are not included. Purchase the appropriate gasket set separately and replace all gaskets during installation.

Q: Can I use this on a 4.3L V6?
A: No. This manifold is specific to the GM small block 5.0L and 5.7L V8 platform. The 4.3L V6 uses a different manifold and riser configuration.

Parts Desk Insights

The most common ordering mistake on this part is not confirming the riser position. Center-riser and end-riser manifolds look similar in photos but are not interchangeable — always have the customer confirm their existing riser location before ordering.

On older 5.0L and 5.7L applications, it’s also worth inspecting the exhaust riser and hose connections at the same time. A manifold that has been running hot due to a failed riser gasket often shows internal corrosion that reduces cooling-passage flow — replacing the manifold alone without checking the riser may result in a repeat issue.