QuickMarine 393659 Thermostat & Seals Kit for Johnson Evinrude 5-235 HP Outboards | Sierra 18-3543 Replacement
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Description
xOverview
The QuickMarine 393659 Thermostat & Seals Kit is designed to refresh aging cooling components on a wide range of Johnson and Evinrude outboards. Built with a stainless steel thermostat body and two durable seals, this kit blends practical reliability with a clean, straightforward installation. Expect a tactile, metal-to-metal feel when handling the parts, and a confident fit when you place the seals against the housing. While it can’t guarantee specific results in every engine, this kit is positioned to support steadier temperature behavior and easier maintenance checks for the seasoned boat owner.
Designed for versatility, the kit targets engines from small 5 HP units up to robust 235 HP, including Jet models in the mid-to-high horsepower range. You can find detailed fitment information in the listing below, helping you verify compatibility with your exact model before installation.
What’s inside
- Stainless steel thermostat assembly with two gaskets for a secure seal
- Two high-quality seals designed to resist wear and keep cooling paths clear
- Cross-compatibility with common OEM references to simplify sourcing
Key specifications and benefits
- Thermostat temperature rated at 60°C (143°F) helps maintain intended engine operating range
- Made from durable stainless steel for long-lasting performance in marine environments
- Includes two gaskets to support a proper seal during cooling cycles
- Replaces widely used cross-reference Sierra 18-3543 and similar aftermarket parts
Compatibility & OEM references
The kit references multiple OEM numbers to aid compatibility checks. Typical cross-compatibility includes: 377148, 0377148, 377612, 0377612, 378065, 0378065, 393659, 0393659, 434841, 0434841, 437414, 0437414, 508626, 0508626, 777260, 0777260, 5005440, 8330720, 59434841. When in doubt, compare these numbers to your current thermostat or consult your dealer for confirmation.
In practice, users often encounter easier analyzer checks and a more confident disassembly/reassembly process thanks to clearly labeled parts and a robust stainless steel construction. This kit is a practical option for proactive maintenance or mid-season service, offering a pathway to restored cooling performance without the guesswork of sourcing individual components.
Installation tips
- Prepare the housing and surrounding seals to ensure a clean seating surface
- Match the OEM numbers listed to confirm fitment before purchasing
- Take care during reassembly to avoid twisting or pinching gaskets
FAQ
Q: Will this thermostat kit fit my Johnson/Evinrude outboard?
A: It covers many 5–235 HP models and Jet engines; verify the OEM numbers noted in the listing for exact fit.
Q: What is included in the kit?
A: Thermostat in stainless steel with two seals; gasket set included for installation.
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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