5005440 Evinrude Johnson Thermostat | Genuine OEM BRP Outboard Part

🔧 Product Description

Genuine BRP Evinrude Johnson 143°F Thermostat Assembly - Part Number: 5005440

A genuine BRP cooling thermostat used across a broad selection of Johnson, Evinrude and E-TEC outboards.

The thermostat is calibrated to begin opening at approximately 143°F / 62°C. It regulates cooling-water flow so the engine reaches and maintains the temperature required for correct combustion, oiling and engine-management operation.

⚙️ Key Features

• Genuine BRP 143°F thermostat
• Correct OEM reference 5005440
• Broad two-stroke, E-TEC and selected four-stroke coverage
• Replaces numerous earlier OMC thermostat references
• Sierra and other aftermarket replacements available

🚤 Compatibility

Commonly used on

• Small conventional Johnson and Evinrude outboards
• Crossflow V4 and V6 engines
• Evinrude E-TEC 40HP-250HP cooling systems
• Selected 9.9HP and 15HP four-stroke engines

Typically suits

• Engine models:
• Selected 6HP-55HP Johnson and Evinrude two-strokes
• 9.9HP and 15HP four-strokes - approximately 1994-2001
• Crossflow V4 and V6 outboards
• Evinrude E-TEC 40HP-90HP
• Evinrude E-TEC 115HP-200HP
• Selected Evinrude E-TEC 225HP and 250HP engines
• Engines whose thermostat diagram specifies any superseded number above
• HP Range: Approximately 6HP - 250HP
• Engine Type: Two-stroke, E-TEC direct-injection or selected four-stroke outboard
• Year Range: Engine-model controlled

🔌 Function

The thermostat restricts cooling-water flow during warm-up and opens as the engine reaches operating temperature.

⚠️ Common Signs of Failure

• Engine runs too cold
• Engine overheats because the thermostat is stuck closed
• Poor idle and excessive carbon buildup
• Temperature alarms occur intermittently
• Thermostat is corroded or salt-encrusted
• Thermostat seal leaks
• Engine does not reach normal operating temperature
• Cylinder-head temperatures are uneven

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 5005440 → Replaces 0777260
• 5005440 → Replaces 0508626 and 0508620
• 5005440 → Replaces 0437414 and 0434841
• 5005440 → Replaces 0393659 and 0378065

OEM / Related Numbers

• 5005440
• 0777260
• 0508626
• 0508620
• 0437414
• 0434841
• 0393659
• 0378065
• 8330720 related thermostat reference

Aftermarket / Verified Equivalents

• Sierra: 18-3543
• OST: OST500
• Waterlong / aftermarket 5005440 thermostat
• Recmar-style replacements sold under 5005440 / 434841

📦 Condition

• Genuine BRP part
• Brand new
• Supplied in original or equivalent packaging