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Mercury MerCruiser Horizon 8.2 ECT - User Manual

Mercury MerCruiser Horizon 8.2 ECT
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© 2012 Mercury Marine
8.2 H.O. ECT, Horizon 8.2 ECT
*8M0061999*
90-8M0061999 512
NOTE: The following applies to CE‑marked products only.
Declaration of Conformity—Mercury MerCruiser
This sterndrive or inboard engine when installed in accordance to Mercury MerCruisers’ instructions complies with the
requirements of the following directives by meeting the associated standards, as amended:
Recreational Craft Propulsion Engines with the Requirements of Directive 94/25/EC as amended by 2003/44/EC
Name of engine manufacturer: Mercury Marine
Address: W6250 Pioneer Road, P.O. Box 1939
Town: Fond du Lac, WI Post Code: 54936‑1939 Country: USA
Name of Authorized Representative: Brunswick Marine in EMEA Inc.
Address: Parc Industriel de Petit‑Rechain
Town: Verviers Post Code: 4800 Country: Belgium
Name of Notified Body for exhaust emission assessment: Det Norske Veritas AS
Address: Veritasveien 1
Town: Hovik Post Code: 1322 Country: Norway ID Number: 0575
Conformity assessment module used for exhaust emissions:
B+C B+D B+E B+F G H
Other Community Directives applied: Electromagnetic Compatibility Directive 2004/108/EC
Description of Engines and Essential Requirements
Engine Type
Fuel Type Combustion Cycle
☒ Inboard engine ☒ Petrol ☒ 4 stroke
Identification of Engines Covered by This Declaration of Conformity
Name of engine family
Unique engine identification number: starting serial number EC Module H certificate number
5.7 MPI 0W307898 RCDH1
Horizon 5.7 0W307898 RCDH1
5.7 MPI ECT 1A090000 RCDH1
Horizon 5.7 ECT 1A090000 RCDH1
6.2 MPI 0W307898 RCDH1
Horizon 6.2 0W307898 RCDH1
6.2 MPI ECT 1A091600 RCDH1
Horizon 6.2 ECT 1A091600 RCDH1
Tow Sports 5.7 MPI 0W307898 RCDH1
Scorpion 350 0W307898 RCDH1
Scorpion 377 0W307898 RCDH1
Tow Sports 5.7 MPI ECT 1A090000 RCDH1
Scorpion 350 ECT 1A090000 RCDH1
Scorpion 377 ECT 1A091600 RCDH1
Horizon 8.1 0W307898 RCDH1
8.1 H.O. 0W307898 RCDH1
Horizon 8.2 ECT 1A350340 RCDH1
8.2 H.O. ECT 1A350340 RCDH1

Table of Contents

Questions and Answers

  • M
    Mrs. Amanda ArnoldAug 1, 2025
    What to do if the starter motor will not crank the Mercury MerCruiser Horizon 8.2 ECT Engine, or cranks slowly?
    • D
      Diana StoneAug 1, 2025
      If the starter motor of your Mercury Engine won't crank the engine or cranks slowly, here are a few things to check: * Ensure the battery switch is turned on. * Make sure the remote control is in the neutral position. * Inspect and reset the main power circuit breaker or replace the fuse if it's open. Also, check the 5 amp fuse on the power harness connected to the battery. * Check all electrical connections and wires, especially the battery cables. Clean and tighten any faulty connections. * Test the battery and charge if needed, or replace it if it's bad. * Verify the lanyard stop switch is not activated.
  • I
    ihartAug 5, 2025
    What to do if Mercury Engine will not start or is hard to start?
    • L
      Lisa PhillipsAug 5, 2025
      If your Mercury Engine won't start or is hard to start, consider the following: * Check the lanyard stop switch to ensure it's not activated. * Review the correct starting procedure. * Ensure there is sufficient fuel supply by filling the fuel tank or opening the valve. * If you suspect a faulty ignition system component, have it serviced. * Replace the fuel filter if it's clogged. * Drain the fuel tank and fill it with fresh fuel if the current fuel is stale or contaminated. * Replace any kinked fuel lines or clear obstructions from the lines with compressed air. * Check all wire connections. * For EFI system faults, have it checked by an authorized Mercury MerCruiser dealer.
  • P
    pgonzalezAug 10, 2025
    What to do if Mercury MerCruiser Horizon 8.2 ECT Engine runs rough, misses, or backfires?
    • C
      Christy ChambersAug 10, 2025
      If your Mercury Engine runs rough, misses, or backfires, here’s what you can check: * Replace the fuel filter if it's clogged. * If the fuel is stale or contaminated, drain the tank and refill with fresh fuel. * Replace any kinked fuel lines or clear obstructions from the fuel tank vent line using compressed air. * Clean the Flame Arrestor. * Have the ignition system serviced if there's a faulty component. * For issues related to idle speed or EFI system faults, have the EFI system checked by an authorized Mercury MerCruiser dealer.
  • S
    samantharileyAug 14, 2025
    Why the steering wheel jerks or is difficult to turn on Mercury MerCruiser Horizon 8.2 ECT?
    • J
      Joseph EvansAug 14, 2025
      If the steering wheel jerks or is difficult to turn on your Mercury Engine, check these items: * Check the power steering pump fluid level for leaks and refill the system if needed. * Replace and/or adjust the drive belt if it's loose or in poor condition. * Lubricate the steering components. * If you find loose or missing steering fasteners or parts, contact an authorized Mercury MerCruiser dealer immediately. * For contaminated power steering fluid, consult an authorized Mercury MerCruiser dealer.
  • S
    Sarah FlynnAug 18, 2025
    What causes low oil pressure in Mercury Engine?
    • A
      Alex McculloughAug 18, 2025
      If you notice low oil pressure in your Mercury Engine, take these steps: * Check the oil level in the crankcase and add oil if it’s insufficient. * If there's excessive oil, remove the required amount and check for the cause, such as improper filling. * Change the oil and oil filter if the oil is diluted or has improper viscosity, using the correct grade and viscosity. Determine the cause of the dilution, such as excessive idling.
  • J
    John CampbellAug 22, 2025
    What to do if the remote control of Mercury Engine is difficult to move?
    • T
      Timothy CunninghamAug 22, 2025
      If the remote control for your Mercury Engine is difficult to move, has excessive play, or makes unusual sounds, try the following: * Lubricate the shift and throttle linkage fasteners. * Remove any obstructions in the shift or throttle linkages. * Check all throttle linkages; if any are loose or missing, contact an authorized Mercury MerCruiser dealer immediately. * Straighten any kinked shift or throttle cables. If the damage is beyond repair, have an authorized Mercury MerCruiser dealer replace the cable.
  • T
    Tyler WilliamsAug 27, 2025
    How to fix Mercury MerCruiser Horizon 8.2 ECT Engine battery that will not recharge?
    • P
      Paul EdwardsAug 27, 2025
      If the battery of your Mercury Engine will not recharge, here are some things to consider: * Turn off any non-essential accessories to reduce the current draw from the battery. * Replace and/or adjust the alternator drive belt if it's loose or in poor condition. * Test the battery and replace it if necessary. * Check all associated electrical connections and wires, especially the battery cables. Clean and tighten faulty connections, and repair or replace any damaged wiring. * Test the alternator output and replace it if necessary.

Summary

Mercury MerCruiser Warranty Information

Mercury MerCruiser Limited Warranty

Details of the manufacturer's limited warranty for gasoline engines.

Safe Boating and Operation On the Water

Carbon Monoxide Exposure Hazards

Warnings and precautions regarding hazardous carbon monoxide gas.

Mercury MerCruiser Engine Specifications

MerCruiser Engine Maintenance Procedures

Engine Oil Maintenance

Procedures for checking, filling, and changing engine oil and filter.

MerCruiser Power Package Storage

Cold Weather or Extended Storage

Recommended procedures for preparing the engine for storage.

Draining the Seawater System

Instructions for draining the seawater cooling system for winterization.

MerCruiser Engine Troubleshooting Guide

Engine Start or Hard Start Issues

Common causes and remedies for engine starting issues.

Engine Runs Rough or Misfires

Troubleshooting steps for engines running poorly or misfiring.

Excessive Engine Temperature

Diagnosing and resolving issues causing engine overheating.

Low Engine Oil Pressure

Identifying causes and solutions for low engine oil pressure warnings.

Customer Assistance and Support

Mercury MerCruiser Horizon 8.2 ECT Specifications

General IconGeneral
BrandMercury
ModelMerCruiser Horizon 8.2 ECT
CategoryEngine
LanguageEnglish

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