Thermostat (130°F/54°C) – Fits Mercury/Mariner, Chrysler/Force (Replaces 895338, F97068-2)

$16.98 $27.00

Shipping calculated at checkout.

Thermostat (130°F/54°C) – Fits Mercury/Mariner, Chrysler/Force (Replaces 895338, F97068-2) is backordered and will ship as soon as it is back in stock.

Worry-free returns

You may return most new, unopened items within 7 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.

Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This is a direct-replacement Thermostat (130°F/54°C) – Fits Mercury/Mariner 30-40 HP 2-Cylinder Outboards (Replaces 895338), engineered to regulate engine temperature for optimal performance. It is designed for Mercury/Mariner 2-Stroke 2-Cylinder 30–40 HP outboards (1994–2018, serial number 0G044027 and up) and a wide range of Chrysler/Force/US Marine 2-Stroke outboards from 25–55 HP (1974–1999).

This part provides a direct interchange for Mercury 895338, Chrysler/Force F97068-2 (which supersedes F97068, F97068-1, and F97098-1), Sierra 18-3556, Mallory 9-43025, and GLM 13200.

Features a corrosion-resistant metal body with an integrated seal for durability.
Installs directly into the factory housing with no modifications required.
Maintains a consistent 130°F (54°C) operating temperature.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number	Notes
Mercury	895338	OEM reference
Chrysler/Force	F97068-2	Replaces F97068, F97068-1, F97098-1
Sierra	18-3556	Aftermarket equivalent
Mallory	9-43025	Aftermarket equivalent
GLM	13200	Aftermarket equivalent

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Mercury/Mariner models, check that your serial number is 0G044027 and up (for USA-made engines) or 9855139 and up (for Belgian-made engines).

For Chrysler/Force/US Marine models, this part fits a broad range of 2-stroke engines manufactured between 1974 and 1999.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercury/Mariner	2-Cylinder	30	2-Stroke	1994–2018	895338	Serial #0G044027 & up (USA), #9855139 & up (BEL)
Mercury/Mariner	2-Cylinder	40	2-Stroke	1994–2018	895338	Serial #0G044027 & up (USA), #9855139 & up (BEL)
Chrysler/Force	Various	25	2-Stroke	1996–1998	F97068-2	Replaces F97068, F97068-1, F97098-1
Chrysler/Force	Various	35	2-Stroke	1974–1982	F97068-2	Replaces F97068, F97068-1, F97098-1
Chrysler/Force	Various	40	2-Stroke	1992–1999	F97068-2	Replaces F97068, F97068-1, F97098-1
Chrysler/Force	Various	45	2-Stroke	1974–1984	F97068-2	Replaces F97068, F97068-1, F97098-1
Chrysler/Force	Various	50	2-Stroke	1981–1999	F97068-2	Replaces F97068, F97068-1, F97098-1
Chrysler/Force	Various	55	2-Stroke	1974–1976	F97068-2	Replaces F97068, F97068-1, F97098-1

Technical Specs

Product Type: Thermostat
Temperature Rating: 130°F (54°C)
Material: Corrosion-resistant metal with integrated seal
Installation: Direct replacement
Housing Material: Precision-engineered corrosion-resistant housing
Other Technical Attributes: Integrated seal
Warranty: Limited lifetime (Sierra aftermarket)

What’s in the Box

1 × Thermostat with Integrated Seal (895338)

Installation Notes

Ensure the engine is cool and disconnect the battery for safety.
Place a drain pan below the engine and drain the cooling system.
Locate the thermostat housing on the engine block or cylinder head.
Remove the bolts securing the housing cover. Note their positions if they are different lengths.
Carefully remove the old thermostat and its seal or gasket.
Clean both the housing and cover mating surfaces thoroughly, removing all old gasket material.
Install the new thermostat, ensuring it is correctly oriented. This part includes an integrated seal.
Re-secure the housing cover and tighten bolts to the manufacturer's specified torque.
Refill the cooling system with the recommended coolant.
Reconnect the battery, start the engine, and check for leaks around the housing as the engine warms up.

Troubleshooting & FAQ

How do I know if this thermostat fits my specific engine?

The most reliable method is to check your engine's part number or serial number. For Mercury/Mariner engines, this thermostat fits models 30 HP and 40 HP (2-Cylinder, 2-Stroke) from 1994–2018 with serial numbers 0G044027 and up. For Chrysler/Force models, it fits a wide variety of 25-55 HP engines from 1974-1999. Always compare the photos and specifications to your old part before ordering.

What are the common signs of a failing thermostat?

A thermostat can fail in two ways: stuck open or stuck closed. If it's stuck open, your engine may run too cool and never reach its optimal operating temperature, leading to poor performance and carbon buildup. If it's stuck closed, the engine will overheat, which can cause severe damage. An alarm or a high reading on your temperature gauge is a clear warning sign.

This thermostat includes an "integrated seal." Do I still need a separate gasket?

No. The integrated seal is designed to replace a traditional separate gasket. It provides a complete seal when installed correctly. Ensure the mating surfaces on the thermostat housing are clean and smooth before installation.

How often should I replace my outboard engine's thermostat?

Replacement intervals vary by engine manufacturer and usage, especially in saltwater. Many service manuals recommend inspection or replacement every 2-3 years or every 200-300 hours as part of preventative maintenance. It is an inexpensive part that is critical to engine health.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

Payment & Security

Payment methods

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.