Thermostat (130°F/54°C) – Fits Mercury/Mariner 30-40 HP 2-Cylinder Outboards (Replaces 895338)

Thermostat (130°F/54°C) – Fits Mercury/Mariner 30-40 HP & Chrysler/Force Outboards

This thermostat is engineered to regulate engine operating temperature, ensuring optimal performance and longevity for a range of two-stroke outboards. It is designed for specific Mercury/Mariner 30-40 HP 2-cylinder models and a wide variety of Chrysler, Force, and US Marine 25-55 HP engines.

Directly replaces Mercury part number 895338; Chrysler/Force part numbers F97068-2, F97068, F97068-1, F97098-1; Sierra part number 18-3556; Mallory part number 9-43025; and GLM part number 13200.

• Operating Temperature: 130°F (54°C)
• Integrated Seal: Includes a built-in seal for a secure, leak-free installation.
• Installation: Designed as a direct drop-in replacement for the original OEM part.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

For Chrysler/Force/US Marine models, confirm your engine model/year in the table below.

Mercury/Mariner Outboards

Chrysler/Force/US Marine Outboards

Technical Specifications

Package Contents

• 1 × Thermostat with Integrated Seal (Replaces 895338)

Installation Guide

1. Safety First: Ensure the engine is completely cool and disconnect the battery cables.
2. Locate Housing: Find the thermostat housing, typically mounted on the cylinder head or engine block.
3. Drain Coolant: Place a suitable container underneath and remove the housing cover bolts to drain coolant from the immediate area.
4. Remove Old Thermostat: Carefully lift out the old thermostat and its gasket/seal. Note its orientation.
5. Clean Surfaces: Thoroughly clean the mating surfaces of the housing and its cover, removing all traces of old sealant or gasket material.
6. Install New Thermostat: Place the new thermostat into the housing, ensuring it is oriented correctly. The integrated seal ensures a proper fit.
7. Reassemble: Re-install the housing cover and tighten the bolts to the manufacturer's recommended torque specifications.
8. Final Steps: Reconnect the battery, refill the cooling system with the appropriate coolant, and check for leaks.
9. Test: Start the engine and let it run, monitoring the temperature gauge to ensure it warms up to the correct operating temperature and remains stable.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my engine?
A: This thermostat is designed for specific Mercury/Mariner 30-40 HP 2-Cylinder outboards (1994–2018, S/N 0G044027+) and various Chrysler/Force 25-55 HP models (1974–1999). Please review the "Compatible Engine Models" and "Part Number Cross-Reference" tables to verify an exact match for your engine's model, year, and serial number.

Q: What are the signs of a failing thermostat?
A: Common symptoms include the engine overheating, the engine failing to reach its normal operating temperature, or erratic temperature gauge readings. A thermostat can fail by getting stuck open (engine runs too cool) or stuck closed (engine overheats).

Q: What is the operating temperature of this thermostat?
A: This thermostat is rated to open at 130°F (54°C), which helps maintain the engine in its optimal temperature range for performance and efficiency.

Q: Does this thermostat include the gasket or seal?
A: Yes, this thermostat features an integrated seal, eliminating the need for a separate gasket and simplifying installation.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.