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MerCruiser Horizon 6.2 - User Manual

MerCruiser Horizon 6.2
110 pages
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© 2007 Mercury Marine 5.7, 6.2 MPI & Horizon 5.7, 6.2
*864197072*
90-864197072 1107
NOTE: The following applies to CE marked products only.
Declaration of Conformance – 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 Directive 94/25/EC; 2003/44/EC
Applicable Requirement Standards Applied
Owner’s manual (A.2.5) ISO 10240
Openings in Hull, Deck and superstructure (A.3.4) ISO 9093‑1; ISO 9093‑2
Handling characteristics (A.4) ISO 8665
Inboard Engine (A.5.1.1) ISO 15584; ISO 10088; ISO 7840; ISO 10133
Fuel System (A.5.2) ISO 10088; ISO 7840; ISO 8469
Electrical System (A.5.3) ISO 10133; ISO 8846
Steering system (A.5.4)
Applicable portions of: ISO 10592, ISO 8848 and
ABYC P‑17
Exhaust emission requirements (B.2) ISO 8178
Owner’s manual (B.4) ISO 8665
Noise emission levels (C.1) ISO 14509
Ignition‑protected equipment (Annex II) ISO 8846; SAE J1171; SAE J1191; SAE J 2031
Mercury MerCruiser declares that our sterndrive or inboard engines without integral
exhaust, when installed in a recreational craft, in accordance with the manufacturers
supplied instructions, will meet the exhaust emissions requirements of the directive
mentioned above. This engine must not be put into service until the recreational craft
in which it is to be installed has been declared in conformity, if so required, with the
relevant provision of the directive.
Electromagnetic Compatibility Directive 89/336/EC, 92/31/EEC and 93/68/EEC
Generic emission standard EN 50081‑1
Generic immunity standard EN 50082‑1
Vehicles, boats and internal combustion engine
driven devices ‑ Radio disturbance characteristics
SAE J551 (CISPR 12)
Electrostatic discharge testing EN 61000‑6‑2; EN 61000‑4‑2; EN61000‑4‑3
The notified body responsible for surveillance of the quality system under Full Quality Assurance
Module H of Directive 2003/44/EC is:
Det Norske Veritas
Norway
Notified Body Number: 0575
This declaration is issued under the sole responsibility of Mercury Marine and Mercury MerCruiser.
Patrick C. Mackey
President ‑ Mercury Marine, Fond du Lac, WI USA

Table of Contents

Questions and Answers

  • P
    Patricia SalinasAug 4, 2025
    Why my MerCruiser Horizon 6.2 Engine will not start?
    • R
      Roberta DanielsAug 4, 2025
      If your MerCruiser Engine won't start or is hard to start: * Check the lanyard stop switch. * Ensure you are following the correct starting procedure. * Verify there is sufficient fuel supply by filling the fuel tank or opening the valve. * Replace the fuel filter if it's clogged. * Drain and refill the fuel tank with fresh fuel if the current fuel is stale or contaminated. * Replace any kinked fuel lines or clear obstructions from the fuel line or tank vent line using compressed air. * Check the wire connections. * If these steps don't resolve the issue, it could be a faulty ignition system component or an EFI system fault, which may require professional service.
  • T
    Teresa JohnsonAug 8, 2025
    What to do if MerCruiser Horizon 6.2 Engine runs rough?
    • S
      schwartzpaulAug 8, 2025
      If your MerCruiser Engine runs rough, misses, or backfires, consider these potential causes and solutions: * Replace the fuel filter if it is clogged. * If the fuel is stale or contaminated, drain the tank and fill it with fresh fuel. * Replace any kinked fuel lines or clear obstructions from the fuel or fuel tank vent line using compressed air. * Clean the flame arrestor. For issues related to low idle speed, a faulty ignition system component, or an EFI System fault, consult a qualified technician.
  • E
    Eric PhelpsAug 13, 2025
    How to improve poor performance of MerCruiser Horizon 6.2 Engine?
    • R
      Robert RubioAug 13, 2025
      If your MerCruiser Engine is showing poor performance, here are a few things to investigate: * Inspect the throttle cable and linkages to ensure the throttle is fully opening. * Consider replacing the propeller if it's damaged or improper. * Drain excessive bilge water and identify the cause of entry. * Reduce the load or redistribute it more evenly if the boat is overloaded or improperly loaded. * Clean the flame arrestor. * Clean or repair the boat bottom if it's fouled or damaged. If the issue persists, it may be related to ignition problems, engine overheating or EFI System fault, which may require professional service.
  • S
    Sharon SolisAug 17, 2025
    What to do if the MerCruiser Horizon 6.2 starter motor won't crank or cranks slowly?
    • K
      Kari WilkinsAug 17, 2025
      If the MerCruiser Engine's starter motor won't crank the engine or cranks it slowly, here's what to check: * Ensure the battery switch is turned on. * Confirm the remote control is in the neutral position. * Inspect and reset any open circuit breakers, or replace blown fuses. * Examine all electrical connections and wires, especially battery cables; clean and tighten any loose or dirty connections. * Test the battery and charge it if necessary, replace it if it's bad. * Verify that the lanyard stop switch is not activated.
  • K
    Kristy JeffersonAug 21, 2025
    Why MerCruiser Horizon 6.2 does not recharge?
    • M
      Morgan LeeAug 21, 2025
      If your MerCruiser Engine is not recharging, consider the following: * Turn off any non-essential accessories to reduce the current draw from the battery. * Replace or adjust the alternator drive belt if it is loose or in poor condition. * Test the battery and replace it if necessary. * Check all associated electrical connections and wires, especially battery cables, for looseness or dirtiness; clean and tighten faulty connections and repair or replace any damaged wiring. * Test the alternator output; replace the alternator if necessary.
  • R
    Ryan WadeAug 26, 2025
    Why is the MerCruiser Horizon 6.2 wheel difficult to turn?
    • M
      millerkennethAug 26, 2025
      If the wheel of your MerCruiser is jerking or difficult to turn: * Check the power steering pump fluid level for leaks and refill the system with fluid if needed. * Replace or adjust the drive belt if it's loose or in poor condition. * Lubricate the steering components. For loose or missing steering fasteners or parts, or contaminated power steering fluid, consult a qualified technician.
  • D
    David MurphyAug 29, 2025
    Why MerCruiser Engine remote control is difficult to move?
    • B
      Becky LeeAug 30, 2025
      If the remote control for your MerCruiser Engine is difficult to move, has excessive play, or makes excessive sounds: * Lubricate the shift and throttle linkage fasteners. * Remove any obstruction in the shift or throttle linkages. For loose or missing shift and throttle linkages, or a kinked shift or throttle cable, consult a qualified technician.

Summary

Declaration of Conformance - Mercury MerCruiser

Electromagnetic Compatibility Directive

Outlines standards for electromagnetic compatibility for marine engines.

Section 1 - Warranty

Warranty Registration: United States and Canada

Mercury MerCruiser Limited Warranty (Gasoline-Fueled Products Only)

Covers the terms and conditions of the limited warranty for gasoline engines.

3-Year Limited Warranty Against Corrosion

Specifies the warranty coverage for corrosion-related issues on marine engines.

Section 2 - Getting to Know Your Power Package

Identification

Remote Controls (Non-DTS Models)

Details the operation of non-Digital Throttle and Shift remote control systems.

Remote Controls (DTS Models)

Details the operation of Digital Throttle and Shift (DTS) remote control systems.

Section 3 - On The Water

Safe Boating Suggestions

Be Alert to Carbon Monoxide Poisoning

Warns about the dangers of carbon monoxide and its symptoms.

Getting Started

Section 4 - Specifications

Fuel Requirements

Specifies the types of gasoline and octane ratings required for engine operation.

Engine Specifications

Lists key performance and technical specifications for various engine models.

Fluid Specifications

Section 5 - Maintenance

Owner;Operator Responsibilities

Outlines the duties of the owner in maintaining the power package.

Maintenance Schedule-Inboard Models

Engine Oil

Changing Oil and Filter

Step-by-step guide for replacing engine oil and oil filters.

Transmission Fluid

Engine Coolant

Water‑Separating Fuel Filter

Flushing The Power Package

Section 6 - Storage

Cold Weather or Extended Storage

Recommendations for preparing the power package for long-term storage.

Preparing Power Package for Storage

Step-by-step guide for winterizing and storing the engine.

Draining the Seawater System

Instructions for draining the engine's seawater cooling system to prevent freeze damage.

Section 7 - Troubleshooting

Diagnosing EFI Problems

Guidance on diagnosing issues with Electronic Fuel Injection systems.

Diagnosing DTS Problems

Guidance on diagnosing issues with Digital Throttle and Shift systems.

Engine Guardian System

Explains the engine protection system and its warning indicators.

Starter Motor Will Not Crank Engine, Or Cranks Slow

Common causes and remedies for starter motor issues.

Engine Will Not Start or Is Hard to Start

Troubleshooting steps for engines that fail to start or are difficult to start.

Engine Runs Rough, Misses, or Backfires

Solutions for engines experiencing rough running or misfires.

Poor Performance

Common reasons for reduced engine performance and how to address them.

Excessive Engine Temperature

Troubleshooting steps for engines running too hot.

Insufficient Engine Temperature

Possible causes and solutions for engines not reaching optimal operating temperature.

Low Engine Oil Pressure

Troubleshooting steps for low oil pressure warnings.

Battery Will Not Recharge

Remote Control Is Difficult to Move, Has Excessive Play, or Makes Unusual Sounds

Steering Wheel Jerks or Is Difficult to Turn

MerCruiser Horizon 6.2 Specifications

General IconGeneral
BrandMerCruiser
ModelHorizon 6.2
CategoryEngine
LanguageEnglish

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