140°F / 60°C Thermostat for Volvo Penta Stern Drive Engines – Replaces 875796
140°F / 60°C Thermostat for Volvo Penta Stern Drive Engines – Replaces 875796 is backordered and will ship as soon as it is back in stock.
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140°F / 60°C Thermostat for Volvo Penta Stern Drive Engines – Repla...
140°F / 60°C Thermostat for Volvo Penta Stern Drive Engines – Replaces 875796 is backordered and will ship as soon as it is back in stock.
Product Details
This 140°F / 60°C thermostat is designed for selected Volvo Penta stern drive and inboard/outboard marine engines. It helps regulate engine coolant temperature by opening at approximately 60°C (140°F), supporting stable operating temperature during normal use.
This is a single thermostat, not a complete thermostat kit. It is intended as a replacement for the thermostat identified by Volvo Penta references 875796, 833366, 15796, and 829812. Sierra 18-3665 is listed as a related aftermarket thermostat-kit reference; kit contents are not included with this single thermostat listing.
- Product type: Single replacement thermostat
- Opening temperature: 60°C (140°F)
- Application: Selected Volvo Penta stern drive and inboard/outboard marine engines
- Installation: OEM-style replacement; verify the original thermostat and housing configuration before ordering
Part Number Matrix
Use the following references to compare the thermostat with the part removed from your engine. These numbers identify the thermostat application and do not indicate that seals, gaskets, housing components, or other kit parts are included.
| Brand or source | Part number | Reference type | Notes |
|---|---|---|---|
| Volvo Penta | 875796 | OEM reference | Primary replacement reference |
| Volvo Penta | 833366 | OEM reference | Additional listed reference |
| Volvo Penta | 15796 | OEM reference | Additional listed reference |
| Volvo Penta | 829812 | OEM reference | Additional listed reference |
| Sierra | 18-3665 | Aftermarket cross-reference | Catalogued as a 140°F thermostat kit; this listing is for the thermostat only |
Engine & Model Compatibility
The company application data identifies the following Volvo Penta models. Confirm the complete engine model, serial information, thermostat dimensions, and housing arrangement against your service documentation before installation.
| Brand | Engine model | Application | Temperature | OEM reference |
|---|---|---|---|---|
| Volvo Penta | AQ140A | Stern drive / inboard-outboard marine engine | 140°F / 60°C | 875796 |
| Volvo Penta | AQ120B | Stern drive / inboard-outboard marine engine | 140°F / 60°C | 875796 |
| Volvo Penta | BB140A | Stern drive / inboard-outboard marine engine | 140°F / 60°C | 875796 |
| Volvo Penta | AQ125A | Stern drive / inboard-outboard marine engine | 140°F / 60°C | 875796 |
| Volvo Penta | MD67C | Marine engine | 140°F / 60°C | 875796 |
| Volvo Penta | MD6A | Marine engine | 140°F / 60°C | 875796 |
| Volvo Penta | MD6B | Marine engine | 140°F / 60°C | 875796 |
| Volvo Penta | MD7A | Marine engine | 140°F / 60°C | 875796 |
| Volvo Penta | MD7B | Marine engine | 140°F / 60°C | 875796 |
| Volvo Penta | MB10A | Marine engine | 140°F / 60°C | 875796 |
Technical Specifications
- Product type
- Single replacement thermostat
- Application
- Selected Volvo Penta stern drive and inboard/outboard marine engines
- Opening temperature
- 60°C (140°F)
- Primary OEM reference
- 875796
- Additional OEM references
- 833366, 15796, 829812
- Aftermarket cross-reference
- Sierra 18-3665 thermostat kit reference
- Included seals or gaskets
- Not specified as included; this listing is for the thermostat only
What's in the Box
- 1 x 140°F / 60°C replacement thermostat
Seals, O-rings, gaskets, thermostat housings, covers, fasteners, coolant, and installation tools are not included unless separately stated on the order or package documentation.
Installation Notes
- Allow the engine to cool completely before beginning work and follow the safety procedures in the engine service manual.
- Confirm that the replacement thermostat matches the removed part and the listed 140°F / 60°C application.
- Drain or contain coolant as required for access to the thermostat housing.
- Remove the thermostat housing cover according to the manufacturer's service procedure.
- Remove the old thermostat and inspect the housing, sealing surfaces, and related seals for damage or corrosion.
- Install the new thermostat in the correct orientation specified by the service manual.
- Reuse or replace sealing components only as specified for the particular engine and housing. Seals and gaskets are not included with this listing unless separately stated.
- Reinstall the housing and tighten fasteners to the manufacturer's specified torque.
- Restore the cooling system using the correct coolant or water configuration for the engine, then bleed or refill it as required.
- Run the engine according to the service procedure and check for leaks and proper temperature regulation before returning the boat to service.
Troubleshooting & FAQ
Is this product a thermostat kit?
No. The company product record identifies this item as a single thermostat. It is not supplied as a complete kit and does not include a seal ring, O-ring, gasket, housing, or cover.
What temperature thermostat is this?
This thermostat is rated at 140°F, equivalent to approximately 60°C.
Which Volvo Penta engines are listed for this thermostat?
The listed applications are AQ140A, AQ120B, BB140A, AQ125A, MD67C, MD6A, MD6B, MD7A, MD7B, and MB10A. Confirm the exact engine configuration and service information before ordering.
Does Sierra 18-3665 mean that seals are included?
Sierra 18-3665 is a related 140°F thermostat-kit reference. It does not change the package contents of this listing. This product includes the thermostat only; seals and other kit components are not included unless expressly stated.
How do I know whether my thermostat is failing?
Possible symptoms include overheating, slow warm-up, unstable temperature readings, or coolant leakage near the thermostat housing. These symptoms can have several causes, so inspect the cooling system and follow the engine manufacturer's diagnostic procedure.
Should I replace the seals when installing the thermostat?
Inspect all sealing components during disassembly and replace them when required by the service manual or when damaged, hardened, flattened, or otherwise unsuitable for reuse. Replacement seals are not included with this thermostat.
Is this an OEM component?
This is an aftermarket replacement thermostat identified for the listed Volvo Penta applications. The displayed Volvo Penta numbers are OEM reference numbers used for application comparison.
How can I confirm fitment?
Compare the thermostat temperature rating, physical design, engine model, and original part reference with your service manual or removed component. Model names alone may not confirm fitment for every serial range or housing configuration.
Safety & Important Information
- Work only on a fully cooled engine and follow the engine manufacturer's service instructions.
- Do not rely on the engine model name alone; verify the thermostat reference and housing configuration before purchase.
- Do not operate the engine with inadequate coolant or with a leaking thermostat housing.
- Professional installation is recommended when the cooling system or engine service procedure is unfamiliar.
About Sea Sierra
- Marine-focused replacement parts — We provide application-oriented components for marine engine maintenance and repair.
- Clear application information — Product references and listed engine models are provided to help you compare the replacement with your original part.
- Support for correct installation — Always use the engine service manual for orientation, sealing, torque, coolant, and final testing requirements.
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