Volvo Penta 3853983 140 Degree Thermostat | Big Block
Volvo Penta 3853983 140 Degree Thermostat | Big Block
Volvo Penta
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Volvo Penta 3853983 — 140 Degree Thermostat | Big Block
Volvo Penta 3853983 is the OEM 140 degree thermostat used on various OMC and Volvo Penta raw water cooled big block marine engines. Fits Volvo Penta 7.4GL, 7.4GI, 7.4GSI, 8.2GL, and 8.2GSI engines from 1994 to 2000, as well as various Volvo Penta 8.1L engines. Also fits OMC 7.4 and 8.2L marine engines from 1994 to 1998. Replaces OMC 3853983.
Confirm Fitment Before Ordering
Not sure if this is the right thermostat for your engine? Give us your engine model and serial number and we'll confirm it for you before you order — by email, text, or live chat.
Part Specifications
- Volvo Penta Part Number: 3853983
- Type: Big block raw water cooling thermostat
- Temperature Rating: 140°F
- Applications: Volvo Penta 7.4GL, 7.4GI, 7.4GSI, 8.2GL, 8.2GSI (1994–2000), various 8.1L engines; OMC 7.4L/8.2L (1994–1998)
- Replaces: OMC 3853983
- OEM: Original Volvo Penta
Additional Information
- Vendor: Volvo Penta
- Part Number: 3853983
- OEM Cross-Reference: Replaces OMC 3853983
Installation Notes
Install following the applicable Volvo Penta or OMC service manual for your engine model.
Frequently Asked Questions
Q: How do I confirm this thermostat fits my engine?
A: Check the application list above. Still not sure? Send us your engine model and serial number and we'll confirm it for you — by email, text, or live chat.
Q: What does the 140 degree rating mean?
A: The thermostat begins to open at 140°F, regulating coolant flow to keep the engine at its designed operating temperature. Installing the wrong temperature rating can cause overheating or underheating.
Q: Does this fit both Volvo Penta and OMC engines?
A: Yes, this thermostat was used across certain Volvo Penta and OMC big block engines built in the 1990s, since OMC and Volvo Penta shared engine platforms during that era. Check the model years and engine designations above.
Q: How do I know if my thermostat needs replacing?
A: Common signs include engine overheating, slow warm-up, or fluctuating temperature gauge readings. If your engine isn't reaching or holding its normal operating temperature, a stuck or worn thermostat is a common cause.
Q: Should I replace the gasket when installing this thermostat?
A: Yes, always install a new gasket or sealant as specified in your service manual when replacing the thermostat to ensure a proper seal and prevent coolant leaks.
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
MacombMarineParts.com is not liable for parts ordered based on assumed fitment. Returns due to buyer-selected incorrect fitment are subject to our standard return and restocking fee policies.