Volvo Penta Intake Manifold Bolt 3858961
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Volvo Penta OEM Intake Manifold Bolt – Part No. 3858961
| Part Number | 3858961 |
| Brand | Volvo Penta |
| Component Type | Intake Manifold Retaining Bolt |
| System | Intake Manifold Assembly |
| Diagram Position | Item 6 in the intake manifold fastening group |
| Quantity Per Assembly | 10 bolts (per applicable Volvo Penta diagrams) |
| Weight | Approx. 8 g each |
| Supersedes | No confirmed superseding number — 3858961 is the current active OEM number |
| Replaced By | No documented replacement |
Compatible Applications
Volvo Penta used multiple intake manifold configurations across similar gasoline engine families. Confirm the engine model, serial number, and intake manifold diagram before ordering.
- Volvo Penta 4.3GXi-GF
- Volvo Penta 5.0GXi-G
- Volvo Penta 5.7GXi-H
- Volvo Penta 5.7OSi-EF
- Volvo Penta V8-300-A
- Volvo Penta V8-320-A
When to Replace
Replace any bolt that is corroded, stretched, has damaged threads, or cannot be torqued to specification. Many Volvo Penta service procedures specify replacing intake manifold fasteners rather than reusing them — check the service manual for the specific engine before deciding to reuse the originals.
Installation Notes
Follow the Volvo Penta intake manifold tightening sequence and torque specification for the exact engine model. Thread engagement and torque are critical on intake assemblies — cross-threading or under-torquing will compromise the manifold seal. Inspect manifold mating surfaces, the intake gasket, MAT/MAP sensor port, and surrounding hardware while the manifold is off.
Technical FAQ
How many bolts do I need?
Volvo Penta diagrams specify 10 bolts per applicable intake manifold assembly. Order the full set to cover a complete manifold removal and reinstall.
Can I use a standard hardware store bolt instead?
Not recommended. 3858961 is specifically cataloged within the Volvo Penta intake manifold assembly. Using the OEM fastener ensures correct dimensions, thread specification, and clamping performance for the intended installation point.
Do I need to replace the intake gasket at the same time?
Yes — whenever the intake manifold is removed, replacing the intake gasket is standard practice. Reusing a compressed gasket can result in air leaks and rough running after reassembly.
Is this bolt specific to fuel-injected GXi engines only?
The confirmed diagram applications are GXi and OSi series and V8-300/320 engines. Other Volvo Penta gasoline engines may use different intake fastener specifications — confirm by serial number and diagram before ordering.
Parts Desk Insights
Intake manifold bolts are one of those parts customers often forget to add to a manifold gasket order — then realize they need them once the old ones are out and corroded. This bolt is specific to the GXi / OSi / V8 intake assembly and is not interchangeable with generic fasteners. A full set of 10 is the standard order for a complete manifold job, and pairing it with the intake gasket avoids a second parts request mid-repair.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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