MerCruiser 8.1S Horizon User Manual

© 2006 Mercury Marine 8.1S and 8.1S Horizon Inboard Models 90-864841062 1206
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

MerCruiser 8.1S Horizon Specifications

General

Brand	MerCruiser
Model	8.1S Horizon
Category	Engine
Language	English

Summary

Section 1 - Warranty

Warranty Registration

Procedures for registering your Mercury MerCruiser product for warranty coverage.

Warranty Coverage Details

Outlines what is covered, duration, and conditions for warranty.

MerCruiser Limited Warranty (Gasoline-Fueled)

Details of the limited warranty for gasoline-fueled products.

Corrosion Warranties

Section 2 - Getting to Know Your Power Package

Lanyard Stop Switch

Remote Controls

Operation of non-DTS and DTS remote control systems.

Audio Warning System

Engine Guardian System

How the system monitors and protects the engine from damage.

Transmission Guardian Strategy

Section 3 - On The Water

Safe Boating Suggestions

Carbon Monoxide Awareness

Information on carbon monoxide hazards and ventilation.

Break-In Period and Checkups

Procedures for engine break-in and initial service checkups.

Section 4 - Specifications

Fuel Requirements and Ratings

Guidelines for using appropriate gasoline types and octane ratings.

Engine Oil Recommendations

Engine Specifications Table

Detailed technical specifications for engine models.

Fluid Specifications

Section 5 - Maintenance

Do It Yourself Maintenance

Maintenance Schedule

Comprehensive schedule for routine and scheduled maintenance.

Engine Oil Maintenance

Procedures for checking, filling, and changing engine oil.

Transmission Fluid Maintenance

Engine Coolant Maintenance

Water Separating Fuel Filter

Serpentine Drive Belt Maintenance

Seawater System Flushing

Section 6 - Storage

Cold Weather or Extended Storage

Recommendations for preparing the engine for storage.

Engine and Fuel System Preparation

Draining the Seawater System

Procedures for draining the seawater cooling system to prevent freezing.

Power Package Recommissioning

Section 7 - Troubleshooting

Diagnosing EFI and DTS Problems

Guidance on troubleshooting electronic fuel injection and digital systems.

Engine Guardian System Issues

Starting Problems

Troubleshooting common issues with starting the engine.

Engine Performance Issues

Addressing rough running, misses, backfires, and poor performance.

Temperature and Oil Pressure Issues

Troubleshooting excessive/insufficient engine temperature and low oil pressure.

Battery and Remote Control Issues