B.B. Thermostat Kit with Gasket for OMC & Volvo Penta – 160°F, Fits 4.3–5.8L Marine V6/V8
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Description
xComplete thermostat replacement for OMC Cobra and Volvo sterndrive
The B.B. Thermostat Kit with Gasket is a fresh, ready-to-install solution designed for select OMC Cobra and Volvo Penta sterndrive systems. This new-in-package kit centers on a 160-degree thermostat, paired with a gasket and an O-ring, ensuring you have the essential components for a proper seal and dependable cooling performance.
Designed to replace multiple OEM and Sierra parts, this kit is a practical choice for boat owners who value a straightforward maintenance path. It speaks to the realities of marine engines: parts wear, gaskets compress over time, and a reliable thermostat helps manage engine temperature as you enjoy longer days on the water. While it cannot replace every engine variant, it covers a broad range of popular Volvos and OMCs, making it a sensible option for many mid-size V6 and V8 marine setups.
What’s included and what to know before ordering
- 1 x 160-degree thermostat (replacement for OEM 3856961)
- 1 x Gasket (replacement for OEM 3852111)
- 1 x O-ring (replacement for OEM 3852071)
- Replaces several known parts: 3856961, 383307, 18-3677, 18-3653
- Fits Volvo Penta and OMC Cobra sterndrive applications across multiple 4.3L to 5.8L V6/V8 engines
- Not designed for 4-cylinder engines
Fitment notes and practical considerations
Volvo marine engines historically used two thermostat sizes; this kit uses the smaller thermostat. Compare your current thermostat size to ensure the best match for your setup. The listed Volvo and OMC applications span common configurations, including 4.3L through 5.8L V6/V8 options, to help you identify the right replacement without guesswork.
Practical benefits for boat owners
Replacing a thermostat, gasket, and O-ring as a single kit offers a streamlined maintenance experience. A properly sized thermostat can contribute to steady engine temperatures, potentially supporting consistent performance during long days on the water. This kit provides a complete, ready-to-install package so you can move from diagnosis to replacement with confidence.
How to use this kit
Before you install, confirm fitment against your engine model and serial range. Have basic hand tools ready, and ensure the cooling system is cool before starting. After installation, monitor the temperature readings to confirm stable operation and look for any leaks around the gasket seal.
FAQ
Q: What engines does this thermostat kit fit?
A: This kit fits Volvo Penta and OMC Cobra sterndrive applications, including 4.3L to 5.8L V6/V8 engines; verify compatibility before ordering.
Q: What is included in the kit?
A: The kit includes a 160-degree thermostat, a gasket, and an O-ring for a complete replacement.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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