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MerCruiser 350 MAG - User Manual

MerCruiser 350 MAG
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© 2007 Mercury Marine 350, 377 & SeaCore 350, 377 Models
*864195072*
90-864195072 1007
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

  • B
    Briana WilliamsAug 13, 2025
    Why my MerCruiser 350 MAG will not start?
    • J
      Jeremiah MorrisonAug 13, 2025
      If your MerCruiser Engine won't start or is hard to start, consider the following: * Check the lanyard stop switch. * Review the correct starting procedure. * Ensure there's sufficient fuel supply by filling the tank or opening the valve. * If you suspect a faulty ignition system component, service the ignition system. * Replace the fuel filter if it's clogged. * Drain and replace stale or contaminated fuel with fresh fuel. * Inspect fuel lines and the tank vent line for kinks or clogs; replace kinked lines or clear obstructions with compressed air. * Check wire connections. * For EFI system faults, have it checked by an authorized Mercury MerCruiser dealer.
  • J
    Jennifer ElliottAug 17, 2025
    What to do if MerCruiser Engine runs rough?
    • C
      Candice McconnellAug 17, 2025
      If your MerCruiser Engine runs rough, misses, or backfires, consider these potential issues: * Replace the fuel filter if it's clogged. * If the fuel is stale or contaminated, drain the tank and refill with fresh fuel. * Check for kinked or clogged fuel lines or the fuel tank vent line; replace kinked lines or clear obstructions with compressed air. * Clean the flame arrestor if it's dirty. * If there's a faulty ignition system component, service the ignition system. * For idle speed issues or EFI System faults, have the EFI system checked by an authorized Mercury MerCruiser dealer.
  • R
    Ryan BrownAug 21, 2025
    How to troubleshoot a MerCruiser 350 MAG Engine that is not recharging?
    • T
      Troy BarnesAug 21, 2025
      If your MerCruiser Engine is not recharging, here are a few things to inspect: * 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 if necessary. * Check all associated electrical connections and wires (especially battery cables) for looseness, dirt, or damage; clean and tighten faulty connections, and repair or replace any damaged wiring. * Test the alternator output and replace if necessary.
  • E
    Elizabeth Mueller MDAug 28, 2025
    What causes an oil pressure issue in a MerCruiser 350 MAG?
    • T
      Tammy PughAug 28, 2025
      If you're experiencing an oil pressure issue with your MerCruiser Engine, consider these points: * Check and add oil if there is insufficient oil in the crankcase. * If there's excessive oil in the crankcase (causing it to become aerated), check and remove the required amount of oil, and identify the cause of the excessive oil (such as improper filling). * If the oil is diluted or of improper viscosity, change the oil and oil filter using the correct grade and viscosity oil, and determine the cause for dilution (such as excessive idling).
  • J
    James MillerSep 1, 2025
    What to do if my MerCruiser 350 MAG Engine starter motor will not crank or cranks slow?
    • M
      Mrs. Vanessa ShortSep 1, 2025
      If the MerCruiser Engine starter motor won't crank the engine or cranks slowly, here's what to check: * Ensure the battery switch is turned on. * Confirm the remote control is in the neutral position. * Inspect for any open circuit breakers or blown fuses and reset or replace them. * Examine all electrical connections and wires, especially battery cables, for looseness, dirt, or damage; clean and tighten faulty connections. * Test the battery and charge it if necessary, or replace it if it's bad. * Verify the lanyard stop switch is not activated.
  • B
    Brian LewisSep 4, 2025
    What to do if the power trim motor does not operate on my MerCruiser 350 MAG?
    • A
      Anthony PattersonSep 4, 2025
      If the power trim on your MerCruiser Engine does not operate and the motor doesn't run, check for these possible causes: * Replace the fuse if it's blown. Fuses may be located near the dash trim switch, at the trim pump, in the positive (red) power trim battery lead near the battery switch, or a combination of these. * Inspect all associated electrical connections and wires (especially battery cables) for looseness, dirt, or damage; clean and tighten faulty connections, and repair or replace any damaged wiring.
  • E
    Edward JonesSep 8, 2025
    What to do if MerCruiser 350 MAG power trim motor operates but sterndrive unit does not move?
    • J
      Jeffery ChapmanSep 9, 2025
      If the power trim motor operates but the sterndrive unit does not move on your MerCruiser Engine, consider the following: * Fill the trim pump with oil if the oil level is low. * Check for any obstructions if the drive unit is binding in the gimbal ring.
  • A
    acostadavidNov 23, 2025
    Why is my MerCruiser 350 MAG Engine showing poor performance?
    • V
      victorhoffmanNov 24, 2025
      If your MerCruiser Engine is showing poor performance, check the following: * Inspect the throttle cable and linkages for proper operation to ensure the throttle is fully open. * Replace the propeller if it's damaged or improper. * Drain excessive bilge water and check for the cause of entry. * Reduce the load or redistribute it more evenly if the boat is overloaded or the load is improperly distributed. * Clean the flame arrestor if it's dirty. * Clean or repair the boat bottom if it's fouled or damaged. * For ignition problems, refer to the Engine Runs Rough, Misses or Backfires information. * For engine overheating, refer to the Excessive Engine Temperature information. * If you suspect an EFI System fault, have the EFI System checked by an authorized Mercury MerCruis...

Summary

Declaration of Conformance - Mercury MerCruiser

Recreational Craft Directive Requirements

Outlines requirements and standards for sterndrive/inboard engines.

Electromagnetic Compatibility

Details EMC requirements and applied standards for emissions and immunity.

Section 1 - Warranty

Warranty Registration Process

Details warranty registration for US, Canada, and international customers.

Mercury MerCruiser Limited Warranty

Covers warranty terms, duration, and conditions for gasoline engines.

Corrosion Warranties

Specifies terms for limited warranties against corrosion damage.

Section 2 - Getting to Know Your Power Package

Identification and Serial Numbers

Explains serial number importance for engineering details and service.

Remote Control Operation

Describes panel, console, DTS, and Zero Effort remote control features.

Power Trim System

Explains the function of power trim for sterndrive angle adjustment.

Section 3 - On The Water

Safe Boating Practices

Provides essential suggestions for safe operation, seating, and avoiding alcohol.

Basic Boat Operation

Covers starting, stopping, trailering, and freezing temperature operation.

Engine Break-In Procedure

Details critical break-in procedures for new engines and post-break-in.

Section 4 - Specifications

Fuel and Oil Requirements

Details required gasoline types, ratings, and recommended engine oil.

Fluid Capacities

Lists capacities and types for engine, sterndrive, steering, and trim fluids.

Section 5 - Maintenance

Maintenance Schedule

Outlines routine and scheduled maintenance tasks for sterndrive models.

Engine Oil and Filter Change

Explains the procedure for changing engine oil and filter.

Sterndrive and Propeller Maintenance

Covers propeller removal/installation, anodes, and surface care.

Flushing the Power Package

Explains general information and procedures for flushing the power package.

Section 6 - Storage

Storage Preparation

Details steps for preparing the engine, fuel system, and boat for storage.

Draining Cooling Systems

Explains procedures for draining various cooling system types.

Battery and Power Package Recommissioning

Covers battery storage and recommissioning the power package.

Section 7 - Troubleshooting

Engine Starting and Running Issues

Lists causes and remedies for engine starting, running, and performance problems.

System Malfunctions

Lists causes and remedies for oil pressure, battery, remote control, steering, and trim issues.

Section 8 - Customer Assistance Information

Obtaining Service and Support

Outlines how to get service, find dealers, and handle submersions.

Parts and Accessories Inquiries

Directs inquiries for parts and accessories to local authorized dealers.

MerCruiser 350 MAG Specifications

General IconGeneral
Engine TypeV8
Horsepower300 hp
IgnitionElectronic
Alternator65 amp
Compression Ratio9.4:1
Torque330 lb-ft
Alternator Output65 amp
Displacement5.7L
Fuel SystemMulti-port fuel injection
Cooling SystemClosed cooling
Bore x Stroke4.00 in x 3.48 in

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