Volvo Penta Thermostat Gasket 3584299 ā D3 Diesel OEM
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Part Information
- Part Number: 3584299
- Brand: Volvo Penta
- Official Product Type: Thermostat Gasket
- System: Cooling System ā Thermostat Housing Assembly
- Engine Family: D3 Marine Diesel
- Assembly Position: Between thermostat 3840816 and thermostat cover 3584473
- Quantity Per Assembly: 1
- Supersedes: No prior part number on record ā 3584299 is the current active OEM number
- Replaced By: No confirmed supersession at this time
Compatible Applications
- Volvo Penta D3-110I-A through D3-110I-H
- Volvo Penta D3-130A / D3-130I (AāC variants)
- Volvo Penta D3-140A / D3-140I (DāH variants)
- Volvo Penta D3-150I (DāH variants)
- Volvo Penta D3-160A / D3-160I (AāC variants)
- Volvo Penta D3-170A / D3-170I (DāH variants)
- Volvo Penta D3-190A / D3-190I
- Volvo Penta D3-200A / D3-200I (DāH variants)
- Volvo Penta D3-220A / D3-220I (DāH variants)
Always confirm against your exact engine model and serial number. The thermostat assembly location varies across D3 generations ā earlier engines place the thermostat beside the exhaust manifold assembly, while later engines place it in the heat-exchanger assembly. The gasket part number is consistent across these layouts, but serial-number verification is still the safest approach.
Serial Number Fitment Notice
Locate your engine identification plate on the block or valve cover and confirm the full D3 model designation and serial number before ordering. Volvo Penta changed the surrounding cooling-system arrangement across D3 generations, so matching by serial number and thermostat diagram is more reliable than matching by horsepower alone.
What This Part Does
This gasket seals the joint between thermostat 3840816 and the thermostat cover (3584473) in the D3 cooling-system assembly. A properly seated gasket prevents coolant from escaping the thermostat housing and maintains the correct pressure and flow within the cooling circuit.
When to Replace
- Any time the thermostat housing is opened for service ā gaskets should never be reused once disturbed
- Gasket is compressed, torn, cracked, or hardened
- Evidence of coolant seepage at the thermostat housing joint
- During thermostat replacement service
- At scheduled cooling-system maintenance intervals when the thermostat is inspected
Service Interval
Replace at every thermostat housing disassembly. A compressed or disturbed gasket will not reseal reliably and is one of the most common causes of coolant leaks following thermostat service. Inspect thermostat 3840816, cover 3584473, and O-ring 3588888 while the assembly is open.
Installation Notes
Clean both mating surfaces ā the thermostat housing and the cover ā completely before fitting the new gasket. Any residue from the old gasket can prevent a flush seal. Install 3584299 in the correct orientation with thermostat 3840816, then tighten the cover hardware to the torque specification in the applicable Volvo Penta service manual. Do not overtighten ā excess crush can crack or distort the gasket and cause leaks. Inspect O-ring 3588888 at the same time and replace if there is any sign of flattening or cracking.
Technical FAQ
Q: Can I reuse this gasket after opening the thermostat housing?
No. Once compressed and disturbed, a gasket will not reseal reliably. Always fit a new gasket on reassembly.
Q: Does this gasket fit all D3 engine variants?
It covers a wide range of D3 models from D3-110I through D3-220A/I across multiple generations. Always confirm your exact engine model and serial number before ordering ā generation and serial-number breaks can affect fitment.
Q: Should I replace the thermostat at the same time?
If the housing is being opened for any reason, inspect thermostat 3840816. If it shows sluggish operation, age-related wear, or the engine has high hours, replacing both the thermostat and gasket together is the most efficient approach and avoids a repeat service call.
Q: What happens if I donāt replace the gasket?
Reusing a disturbed gasket is one of the most common causes of coolant leaks following thermostat service on diesel marine engines. Even a minor coolant leak at the thermostat housing can lead to coolant loss, overheating, and engine damage if not caught early.
Related Parts ā Commonly Serviced Together
- Volvo Penta Thermostat 3840816 ā the thermostat this gasket seals; replace together for complete thermostat service
Parts Desk Insights
Best use case: Any D3 thermostat service. This gasket is the essential companion to thermostat 3840816 ā it should be ordered any time a customer orders the thermostat. At this price point, adding the gasket to a thermostat order is an easy way to ensure the service is completed correctly without a return visit.
Common issue: The most frequent post-service problem on D3 thermostat jobs is coolant seepage at the housing joint ā almost always caused by reusing the old gasket or failing to clean the mating surfaces before reassembly. Reminding customers to replace the gasket and clean both sealing faces every time they open the housing prevents the most common callback on D3 cooling-system work.
Shipping information
In-stock and OEM parts: ship same or next business day.
Supplier-stock items are usually ready for pickup or shipping within 24 hours of ordering.
Special-order timing may vary.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us ā 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 ā 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.