Sierra Thermostat — Kohler Marine Engines — 47-233608
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Sierra Thermostat — Kohler Marine Engines — 47-233608
A direct-fit replacement thermostat for compatible Kohler marine engines. The thermostat regulates engine operating temperature by controlling coolant flow — keeping the engine within its optimal temperature range for efficient combustion, reduced wear, and long-term reliability. At just 68g, this is a small but critical component in the engine’s cooling system.
Key Features
- Direct-fit replacement for compatible Kohler marine engine applications
- Regulates coolant flow to maintain optimal engine operating temperature
- Built to OEM fit and performance specifications
Compatibility
- Small to Mid-Range Units: 4EF, 5E, 6EF, 7.3E, 8E
- Larger Commercial Units: 10E, 12.5E, 12.5CF, 15C, 16CF, and 20C
Fits select Kohler marine engine models including generator sets and inboard auxiliary applications. Verify fitment using your engine model number and serial number before ordering — thermostat specifications vary across Kohler engine families.
Parts Desk Insights
Best use case: Thermostat replacement is one of the most common and cost-effective cooling system repairs on marine engines. A failed thermostat typically causes the engine to run either too cold (thermostat stuck open) or overheat (thermostat stuck closed) — both of which accelerate wear and can cause serious engine damage if left unaddressed. When replacing the thermostat, it is best practice to replace the thermostat gasket or O-ring at the same time and inspect the housing for corrosion. Always verify the correct temperature rating for your engine before ordering, as thermostats are available in different opening temperatures. Confirm engine model and serial number compatibility before ordering.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.