Thermostat Kit – Fits Volvo Penta 3.0-8.1L Engines (Replaces 3587597, 3852111, 3852071)
Thermostat Kit – Fits Volvo Penta 3.0-8.1L Engines (Replaces 3587597, 3852111, 3852071) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Thermostat Kit – Fits Volvo Penta 3.0-8.1L Engines (Replaces 358759...
Product Details
This Thermostat Kit – Fits Volvo Penta 3.0-8.1L Engines (Replaces 3587597, 3852111, 3852071) is designed for Volvo Penta 3.0L, 4.3L, 5.0L, 5.7L, and 8.1L marine engines manufactured from 2002 and up. The kit provides a reliable solution for maintaining optimal engine operating temperature.
It serves as a direct replacement for Volvo Penta 3587597, Sierra 18-3618, Sierra 18-3615, and Sierra 18-2917, ensuring broad interchange compatibility.
- Includes a 150°F (65.6°C) thermostat with the necessary gasket and O-ring seals for a complete installation.
- Engineered as a direct OEM replacement for straightforward, hassle-free mounting.
- Specifically designed for gasoline-powered 4-stroke marine engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 3587597 |
| Sierra | 18-3618 |
| Sierra | 18-3615 |
| Sierra | 18-2917 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This thermostat kit is confirmed to fit the following Volvo Penta engine models that require a 150° thermostat.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 4.3 GL-J | 4.3L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
| Volvo Penta | 4.3 GLP-B/C/D/E | 4.3L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
| Volvo Penta | 4.3 GXi-C/D/E/F/G | 4.3L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
| Volvo Penta | 5.0 Gi-C/D | 5.0L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
| Volvo Penta | 5.0 GL-C/D/E/F/G/J | 5.0L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
| Volvo Penta | 5.0 GXi-C/D/E/F/G/J/N | 5.0L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
| Volvo Penta | 5.0 GXi-JK,JF | 5.0L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
| Volvo Penta | 5.7 Gi-C/D | 5.7L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
| Volvo Penta | 5.7 GL-C/D/E/F/G/J | 5.7L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
| Volvo Penta | 5.7 GXi-C/D/E/F/G/J/N | 5.7L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
| Volvo Penta | 5.7 GXi-JK,JF | 5.7L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
| Volvo Penta | 3.0L | 3.0L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
| Volvo Penta | 8.1L | 8.1L | 4-Stroke | 2002 & Up | 3587597 | All models with 150° thermostat |
Technical Specs
- Product Type
- Marine Engine Thermostat Kit
- Installation
- Direct OEM replacement
- Fuel Type
- Gasoline
- Connection
- Direct mount to engine block
- Fitting Type
- Thermostat housing mount
- Burst Pressure
- N/A
- Operating Temperature
- 150°F (65.6°C) thermostat opening temperature
- Other Technical Attributes
- For engines with 150° thermostat
What’s in the Box
- 1 x Thermostat (3587597)
- 1 x Gasket (3852111)
- 1 x O-ring (3852071)
Installation Notes
- Disconnect the battery before beginning work.
- Drain the engine coolant to a level below the thermostat housing, following the engine manufacturer’s procedure.
- Locate the thermostat housing and carefully remove the bolts or screws securing the cover.
- Remove the old thermostat, gasket, and any O-rings. Note the orientation of the old thermostat for correct placement of the new one.
- Thoroughly clean the mating surfaces of the thermostat housing and its cover to ensure a clean, dry seal.
- Install the new thermostat in the correct orientation.
- Place the new gasket and O-ring in their designated positions.
- Reinstall the housing cover and tighten the bolts to the manufacturer's specified torque settings.
- Refill the cooling system with the manufacturer-recommended coolant.
- Reconnect the battery.
- Start the engine, let it reach operating temperature, and carefully check the housing for any coolant leaks.
Troubleshooting & FAQ
How do I know if my engine needs a 150°F thermostat?
This 150°F (65.6°C) thermostat is specified for the Volvo Penta engines listed in the compatibility table, typically from 2002 and newer. Always check your service manual or the markings on your existing thermostat to confirm the required temperature rating. Using the wrong temperature can affect engine performance and efficiency.
What are the signs of a faulty thermostat?
Common symptoms include engine overheating (stuck closed), the engine not reaching normal operating temperature (stuck open), erratic temperature gauge readings, and poor engine performance or fuel economy. Coolant leaks around the thermostat housing can also indicate a failed seal.
Can I reuse my old gasket or O-ring?
No. It is critical to use the new gasket and O-ring included in this kit. Old seals can become brittle and compressed, and reusing them will likely result in coolant leaks. Always install new seals on clean, dry surfaces.
How often should I replace my engine's thermostat?
Thermostats are a regular maintenance item. While intervals vary, many marine mechanics recommend replacement every 3-5 years or as part of a major cooling system service to prevent failure during operation.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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