Volvo Penta Heat Exchanger Cover Screw 3858994
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Volvo Penta OEM Heat Exchanger Cover Screw – Part No. 3858994
| Part Number | 3858994 |
| Brand | Volvo Penta |
| Component Type | Heat Exchanger Cover Screw |
| System | Freshwater Cooling — Heat Exchanger Assembly |
| Diagram Position | Heat exchanger cover / anode service area |
| Related Components | Heat exchanger cover 3858992 · Gasket 3858993 · O-ring 983191 · Anode 3858995 |
| Weight | Approx. 14 g |
| Supersedes | No confirmed OEM superseding number — 3858994 is the current active number |
| Replaced By | No documented replacement |
Compatible Applications
Heat exchanger hardware fitment depends on the exact engine model, freshwater-cooling package, heat exchanger assembly style, and serial number range. Confirm 3858994 against the Volvo Penta heat exchanger diagram for the specific engine before ordering.
- Volvo Penta 5.0GL-FF
- Volvo Penta 5.0GXi-EF
- Volvo Penta 5.7OSi-EF
- Volvo Penta 5.7OSXi-JF
- Volvo Penta 8.1Gi-A
- Volvo Penta 8.1GXi-A
- Volvo Penta 8.1GXi-FF
When to Replace
Replace this screw if the original is corroded, stripped, rounded, seized, or damaged during heat exchanger service. Heat exchanger cover hardware should be in serviceable condition to maintain proper clamping around the cover, gasket, and anode area. Replacing corroded screws as part of each heat exchanger service is good practice in a marine environment.
Installation Notes
Confirm the screw’s position in the heat exchanger diagram before installation. While the heat exchanger cover is off, inspect the cover (3858992), gasket (3858993), O-ring (983191), and anode (3858995) — these components are all accessible at the same time and are commonly serviced together. Clean the sealing surfaces before reassembly and tighten to the Volvo Penta specification for the engine — avoid over-tightening small heat exchanger hardware.
Technical FAQ
Does this screw fit all freshwater-cooled Volvo Penta gasoline engines?
No — fitment is specific to confirmed heat exchanger applications listed above. Similar Volvo Penta heat exchanger hardware can look alike but serve different positions or assemblies. Match by diagram position and engine serial number.
What else should I replace at the same time?
While the heat exchanger cover is off, inspect and replace the cover gasket (3858993), O-ring (983191), and anode (3858995) as needed. These parts are all in the same service area and are the lowest-cost items in a heat exchanger service.
How do I know if my engine has a heat exchanger?
Heat exchangers are used on freshwater-cooled (closed-cooling) Volvo Penta engine configurations. If the engine uses a separate coolant reservoir and the raw water runs through a heat exchanger rather than directly through the engine block, this type of hardware applies. Confirm by the engine model suffix and cooling-system diagram.
Parts Desk Insights
This screw typically comes up during heat exchanger cover removal for anode or gasket service. It’s a low-cost item that’s easy to add to a heat exchanger service order — corroded screws discovered mid-job are a common delay on freshwater-cooled engines that haven’t been serviced in a few seasons. Ordering the gasket, O-ring, and anode alongside the screw covers a complete cover service without a second parts request.
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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