Volvo Penta Thermostat 3587597
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The Volvo Penta 3587597 Thermostat is a genuine OEM cooling system component engineered to provide precise thermal regulation in Volvo Penta gasoline marine engines.
This thermostat uses a wax-element valve mechanism that expands at a calibrated temperature to control coolant flow through the engine. By maintaining the correct operating temperature, it ensures proper combustion efficiency, optimal fuel burn, correct oil viscosity, and protection of internal engine components.
Operating at approximately 150°F (65.5°C), this thermostat is specifically designed for raw water–cooled and closed cooling Volvo Penta systems. It helps prevent both overheating and overcooling—two conditions that can significantly reduce engine life and performance.
Manufactured to Volvo Penta's strict OEM tolerances, this unit provides exact fitment, reliable opening characteristics, and long-term durability in harsh marine environments including saltwater exposure.
Key Features
- Genuine Volvo Penta OEM thermostat
- Precision-calibrated 150°F (65.5°C) opening temperature
- Maintains optimal engine operating temperature range
- Prevents overheating and cold-running conditions
- Ensures stable coolant flow under load
- Wax-element design for accurate thermal response
- Corrosion-resistant marine-grade brass and stainless construction
- Direct OEM replacement – no modification required
Engine Compatibility
Volvo Penta Gasoline Engines (2001–Present GM-Based Platforms)
Commonly used on:
- 3.0L GL / GS / GXi
- 4.3L V6 GL / GI / GXi / OSi
- 5.0L V8 GL / GI / GXi / OSi
- 5.7L V8 GL / GI / GXi / OSi
- 8.1L V8 Gi / GXi
Covers a wide range of late-model Volvo Penta sterndrive engines (2002+ applications).
Specific Engine Series Examples
- 4.3GXi-P / 4.3GL-P
- 5.7GiCE / 5.7GL-A
- V6-200 / V6-225
- V8-225 / V8-270 / V8-300 / V8-320
Used across V6 and V8 Volvo Penta gasoline platforms.
Drive & Application Compatibility
- SX sterndrives
- DP-S / DP-SM / DP-E / DP-G duoprop systems
- Inboard gasoline engines with similar cooling architecture
Serial Number Fitment Notice
Fitment depends on:
- Engine model and year
- Cooling system type (raw water vs closed loop)
- Thermostat housing design
Always confirm compatibility using your engine serial number before ordering.
Specifications
- Part Number: 3587597
- Type: Engine thermostat
- Temperature Rating: 150°F (65.5°C)
- Diameter: ~1-7/8"
- Operation: Wax-element, spring-loaded valve
- Construction: Brass thermal element, stainless steel spring and frame
- Cooling System Type: Raw water & closed cooling compatible (application dependent)
What's Included
- Thermostat only
(Seal / gasket sold separately unless specified)
When This Part Needs Replacement
Replace the thermostat if you experience:
- Engine overheating at idle or under load
- Engine running below normal temperature
- Slow warm-up or failure to reach operating temp
- Fluctuating or unstable temperature gauge
- Reduced fuel efficiency or poor combustion
Installation Notes
- Always inspect and replace O-ring/gasket separately
- Install with correct orientation (spring side toward engine)
- Clean thermostat housing and sealing surfaces
- Inspect cooling passages for debris or corrosion
- Verify proper temperature operation after installation
Alternate / Superseded Part Numbers
OEM Cross References
- Volvo Penta: 3587597
- Supersedes: 3862835
Aftermarket Cross References
- Sierra: 18-3615 / 18-3618
- OMC: 3701777
- Mercury: 27-53045 / 27-33179
💡 Parts Desk Insight
This is one of the most common Volvo gas thermostats (post-2002)—if your engine won't hit temp or runs inconsistent, this is usually the first part to replace.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
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.