806490T Mercury MerCruiser Water Temp Sensor | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Water Temperature Sender - Part Number: 806490T

A genuine Quicksilver water temperature sender used on a wide range of MerCruiser petrol and diesel sterndrive, inboard and tow-sport engines. This sender monitors engine coolant or water temperature and provides the signal required for the temperature gauge or monitoring system.

⚙️ Key Features

• Genuine Quicksilver OEM water temperature sender

• Direct replacement for earlier MerCruiser temperature sender numbers

• 3/8 inch NPT-style sender application

• Used across many MerCruiser V6, V8, inboard and sterndrive platforms

• Helps maintain accurate temperature monitoring and overheat warning awareness

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 806490T → Supersedes 97257A1

• 806490T → Supersedes 806490

• 97257A1 earlier OEM reference

OEM / Related Numbers:

• 806490T

• 806490

• 97257A1

• 97257

• 22-811091

• 36525

• 980613

• 3853787

Aftermarket / Verified Equivalents:

• Sierra: 18-5897

• Recmar: REC806490T

• Red Rhino: MR-583

• VeeThree / SeaStar: 52320A018

🚤 Compatibility

Commonly used on:

• MerCruiser sterndrive, inboard, tow-sport, Vazer, Scorpion and Mercury Racing temperature sender applications

Typically suits:

• Engine models:

• 3.0L GM 181 I/L4 - serial 0L097000 to 0W301999

• 3.0L GM 181 I/L4 - serial 0W302000 to 1A0019999

• 3.0L MPI EC - serial 1A072812 and up

• 100 Vazer - serial 1A035000 to 1A036006

• 100 Vazer EC - serial 1A035295 to 1A036006

• 4.3L Carb Alpha / Bravo - serial 0M615000 to 0W300012

• 4.3L Carb Alpha / Bravo - serial 0W300013 to 0W309999

• 4.3L Carb Alpha / Bravo - serial 0W310000 to 0W649999

• 4.3L Carb Alpha / Bravo - serial 0W650000 to 1A063239

• 4.3L Carb Alpha / Bravo - serial 1A063240 and up

• 4.3L MPI Alpha / Bravo - serial 0M300000 to 0M614999

• 4.3L MPI Alpha / Bravo - serial 0M615000 to 0W309999

• 4.3L MPI Alpha / Bravo - serial 0W310000 to 0W649999

• 4.3L MPI Alpha / Bravo - serial 0W650000 to 1A063239

• 4.3L MPI Alpha / Bravo - serial 1A063240 and up

• 5.0L Carb Alpha / Bravo - serial 0M600000 to 0W300009

• 5.0L Carb Alpha / Bravo - serial 0W300010 to 0W309999

• 5.0L Carb Alpha / Bravo - serial 0W310000 to 0W649999

• 5.0L Carb Alpha / Bravo - serial 0W650000 and up

• 5.0L MPI Alpha / Bravo - serial 0M300000 to 0M599999

• 5.0L MPI Alpha / Bravo - serial 0M600000 to 0W059999

• 5.0L MPI Alpha / Bravo - serial 0W060000 to 0W309999

• 5.0L MPI Alpha / Bravo - serial 0W310000 to 0W649999

• 5.0L MPI Alpha / Bravo - serial 0W650000 to 1A299999

• 5.7L Carb Alpha / Bravo - serial 0M600000 to 0W300754

• 5.7L Carb Alpha / Bravo - serial 0W300755 to 0W309999

• 5.7L Carb Alpha / Bravo - serial 0W310000 to 0W649999

• 5.7L Carb Alpha / Bravo - serial 0W650000 and up

• 350 MAG MPI Alpha / Bravo - serial 0L331599 to 0M299999

• 350 MAG MPI Alpha / Bravo - serial 0M300000 to 0M599999

• 350 MAG MPI Alpha / Bravo - serial 0M600000 to 0W059999

• 350 MAG MPI Alpha / Bravo - serial 0W060000 to 0W309999

• 350 MAG MPI Alpha / Bravo - serial 0W310000 to 0W649999

• 350 MAG MPI Alpha / Bravo - serial 0W650000 to 1A299999

• 350 MAG MPI Alpha / Bravo - serial 1A300000 to 1A611927

• 350 MAG MPI Alpha / Bravo - serial 1A611928 to 1A623184

• 350 MAG MPI Alpha / Bravo - serial 1A623185 and up

• 350 MAG MPI Horizon Alpha / Bravo - serial 0M300000 to 0M599999

• 350 MAG MPI Horizon Alpha / Bravo - serial 0M600000 to 0W059999

• 350 MAG MPI Horizon Alpha / Bravo - serial 0W060000 to 0W309999

• 350 MAG MPI Horizon Alpha / Bravo - serial 0W310000 to 0W649999

• 350 MAG MPI Horizon Alpha / Bravo - serial 0W650000 to 1A299999

• 350 MAG MPI Horizon Alpha / Bravo EC - serial 1A300000 to 1A611927

• 350 MAG MPI Horizon Alpha / Bravo EC - serial 1A611928 to 1A623184

• 350 MAG MPI Horizon Alpha / Bravo EC - serial 1A623185 and up

• 377 MAG MPI Bravo - serial 1A300000 to 1A611927

• 377 MAG MPI Bravo - serial 1A611928 to 1A623184

• 377 MAG MPI Bravo - serial 1A623185 and up

• 496 MAG Base Model - serial 0M025000 to 0M687082

• 496 MAG Base Model - serial 0M687083 to 0W059999

• 496 MAG Base Model - serial 0W060000 to 0W309999

• 496 MAG Base Model - serial 0W310000 to 0W649999

• 496 MAG Base Model - serial 0W650000 to 1A066165

• 496 MAG Base Model - serial 1A066166 to 1A350678

• 496 MAG Base Model - serial 1A350679 and up

• 496 MAG H.O. Model - serial 0M025000 to 0M687143

• 496 MAG H.O. Model - serial 0M687144 to 0W059999

• 496 MAG H.O. Model - serial 0W060000 to 0W309999

• 496 MAG H.O. Model - serial 0W310000 to 0W649999

• 496 MAG H.O. Model - serial 0W650000 to 1A066165

• 496 MAG H.O. Model - serial 1A066166 to 1A350678

• 496 MAG H.O. Model - serial 1A350679 and up

• MX 6.2L MPI Bravo - serial 0M300000 to 0M599999

• MX 6.2L MPI Bravo - serial 0M600000 to 0W059999

• MX 6.2L MPI Bravo - serial 0W060000 to 0W309999

• MX 6.2L MPI Bravo - serial 0W310000 to 0W649999

• MX 6.2L MPI Bravo - serial 0W650000 to 1A299999

• MX 6.2L MPI MIE - serial 0M310000 to 0M316999

• MX 6.2L MPI MIE - serial 0M317000 to 0M398394

• MX 6.2L MPI MIE - serial 0M398395 to 0W389999

• MX 6.2L MPI MIE - serial 0W390000 to 0W689999

• MX 6.2L MPI MIE - serial 0W690000 to 1A089999

• 8.1L Inboard Base - serial 0M026000 to 1A380318

• 8.1L Inboard H.O. - serial 0M026000 to 1A380318

• 8.2L MIE MPI GM 502 V8 - serial 0L086013 to 0L674200

• Black Scorpion 350 MAG MPI - serial 0M391600 to 0W698432

• Black Scorpion MX 6.2L MPI - serial 0M391750 to 0W698432

• Scorpion 350 - serial 0W698433 and up

• Scorpion 377 - serial 0W698433 and up

• CMD 1.7 MI 120 I/L4 - serial 88109041 and up

• CMD 1.7 MS 120 I/L4 - serial 8810800 and up

• D1.7L DTI - serial 0M055000 to 0M999999

• D7.3L D-Tronic 260 / 300 - serial 0L050050 and up

• 575 SCi - serial 0M900000 to 0M950526

• HP Range: commonly used across 100HP Vazer, 120HP diesel, V6 and V8 MerCruiser petrol, Scorpion and high-output racing applications

• Engine Type: MerCruiser petrol / diesel sterndrive and inboard engines

• System Type: Water temperature sender circuit

🔌 Function

The water temperature sender reads engine temperature and sends the temperature signal to the gauge or monitoring circuit so the operator can monitor engine heat and identify overheating issues.

Common signs of failure:

• Temperature gauge reads incorrectly

• Gauge stays cold when engine is warm

• Gauge reads hot when engine is not overheating

• Intermittent temperature readings

• Corrosion or leakage around the sender body

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging