MerCruiser Scorpion 377 User Manual

© 2007 Mercury Marine Scorpion 350, 377
*865253071*
90-865253071 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

MerCruiser Scorpion 377 Specifications

General

Brand	MerCruiser
Model	Scorpion 377
Category	Engine
Language	English

Summary

Section 1 - Warranty

Mercury MerCruiser Limited Warranty (Gasoline-Fueled Products Only)

Terms and conditions of the limited warranty for gasoline engines.

3-Year Limited Warranty Against Corrosion

Specific warranty coverage for corrosion issues on marine engines.

Section 2 - Getting to Know Your Power Package

Lanyard Stop Switch

Audio Warning System

Engine Guardian Strategy

How the system monitors and protects the engine from damage.

Warning Horn Signals

Section 3 - On the Water

Be Alert to Carbon Monoxide Poisoning

Awareness and prevention of carbon monoxide hazards.

Starting and Stopping the Scorpion Engine

Step-by-step guide for starting and stopping the engine.

Freezing Temperature Operation

Protecting People in the Water

Wave and Wake Jumping

Impact with Underwater Hazards

Cavitation

Propeller Selection

Guidelines for choosing the correct propeller for optimal RPM.

20-Hour Break-In Period

Essential rules for the engine's initial break-in period.

Section 4 - Specifications

Fuel Requirements

Guidelines on using appropriate gasoline for the engine.

Fuel Ratings

Engine Specifications

Key performance and physical specifications for engine models.

Fluid Specifications

Capacity and type of fluids for engine and transmission.

Section 5 - Maintenance

Owner/Operator Responsibilities

Inspection

Maintenance Schedule-Inboard

Schedule of routine and periodic maintenance tasks for inboard engines.

Routine Maintenance

Scheduled Maintenance

Periodic maintenance tasks based on hours or time intervals.

Engine Oil

Procedures for checking and filling engine oil levels.

Changing Oil and Filter

Steps for changing engine oil and oil filter.

Changing Water Separating Fuel Filter

Procedure for replacing the water-separating fuel filter.

In-line Fuel Filter

Steps to replace the in-line fuel filter.

Section 6 - Storage

Cold Weather or Extended Storage

Recommended procedures for storing the boat in cold weather.

Preparing Power Package for Storage

Steps to prepare the engine and fuel system for storage.

Draining the Seawater System

Procedures for draining the seawater cooling system.

AIR ACTUATED SINGLE POINT DRAIN SYSTEM

MANUAL SINGLE POINT DRAIN SYSTEM

THREE POINT MANUAL DRAIN SYSTEM

MULTI-POINT DRAIN (MPD) SYSTEM

Power Package Recommissioning

Steps to recommission the power package after storage.

Section 7 - Troubleshooting

Diagnosing EFI Problems

Using diagnostic tools to identify Electronic Fuel Injection system issues.

Engine Guardian System

Understanding and responding to Engine Guardian system alerts.

Starter Motor Will Not Crank Engine, Or Cranks Slow

Troubleshooting steps for starter motor issues.

Engine Will Not Start or Is Hard to Start

Common causes and remedies for starting problems.

Engine Runs Rough, Misses, or Backfires

Diagnosing and fixing engine running issues.

Poor Performance

Identifying causes of reduced engine performance.

Excessive Engine Temperature

Troubleshooting overheating issues.

Insufficient Engine Temperature

Low Engine Oil Pressure

Troubleshooting steps for low engine oil pressure.

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