1986 Merc 350 Cruiser Manual

The 1986 Merc 350 Cruiser is a classic marine vessel powered by a 350 cubic inch Mercury marine engine, featuring hydraulic steering, fiberglass hull construction, integrated instrumentation panel, marine-grade upholstery, bilge pump system, navigation lights, and comprehensive safety equipment. Designed for recreational cruising with a maximum capacity of 8 passengers. Below are key sections for safety, features, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Pre-Launch Checklist 3. Starting Procedure 4. Specifications 5. Controls and Instrumentation 6. Operating Instructions 7. Maintenance Schedule 8. Winterization 9. Safety Equipment 10. Regulatory Compliance 11. Troubleshooting

Features at a Glance

Key components: 350 cubic inch Mercury marine engine, hydraulic steering system, fiberglass hull, marine instrumentation panel, bilge pump, navigation lights, seating for 8.

FeatureDescription
Engine350 cubic inch Mercury marine V8
SteeringHydraulic power steering system
HullFiberglass construction with gelcoat finish
InstrumentationSpeedometer, tachometer, fuel gauge, temperature gauge
Bilge SystemAutomatic bilge pump with manual override
Navigation LightsBow and stern lighting for night operation
Seating Capacity8 passengers maximum
Fuel Capacity55 gallons marine fuel tank
IgnitionKey start with safety lanyard
Throttle/ShiftSingle lever control for throttle and gear selection

Pre-Launch Checklist

Complete inspection before each launch to ensure safe operation.

  1. Check fuel level and inspect for leaks in fuel system
  2. Verify bilge pump operation and check for water in bilge
  3. Inspect hull for damage or cracks in fiberglass
  4. Test navigation lights and all electrical systems
  5. Check engine oil level and coolant level
  6. Ensure safety equipment is present and accessible
  7. Verify drain plug is properly installed

WARNING! Never operate vessel without completing pre-launch checklist. Failure to inspect may result in serious injury or vessel damage.

Starting Procedure

Proper engine starting sequence for reliable operation.

  1. Ensure gear shift is in neutral position
  2. Turn battery switch to ON position
  3. Insert key and turn to ON position (do not start)
  4. Wait for alarm buzzer to stop (approximately 3 seconds)
  5. Turn key to START position and release when engine starts
  6. Allow engine to warm up at idle for 2-3 minutes
  7. Check for proper water flow from exhaust

CAUTION! Do not operate starter for more than 15 seconds continuously. Allow 30 seconds between starting attempts.

Specifications

Controls and Instrumentation

Main control panel located at helm station with comprehensive instrumentation.

Controls: Ignition key switch, throttle/shift control, steering wheel, trim switch, bilge pump switch, navigation light switch.

Instrumentation: Speedometer (MPH), tachometer (RPM), fuel gauge, engine temperature gauge, oil pressure gauge, voltmeter. Additional switches for blower, horn, and accessories.

Operating Instructions

Safe operation procedures for various conditions.

  1. Always check weather conditions before departure
  2. Maintain proper lookout at all times
  3. Observe no-wake zones and speed limits
  4. Use trim control to optimize ride quality and fuel efficiency
  5. Monitor engine gauges continuously during operation
  6. Reduce speed in rough water conditions
  7. Always wear safety lanyard when operating at planing speeds

Tip: Allow extra stopping distance in water - boats do not have brakes.

Maintenance Schedule

Regular maintenance ensures reliable performance and longevity.

  1. Every 50 hours: Check engine oil, inspect drive belt, check fluid levels
  2. Every 100 hours: Change engine oil and filter, inspect spark plugs
  3. Every 200 hours: Change gear lube, inspect fuel filter, check steering system
  4. Annual: Full systems check, hull inspection, electrical system test
  5. Seasonal: Winterization and spring commissioning

WARNING! Use only marine-grade parts and fluids. Automotive parts may not withstand marine environment.

Winterization

Proper winter storage procedures to prevent damage.

  1. Add fuel stabilizer to full fuel tank
  2. Change engine oil and filter
  3. Fog engine cylinders through spark plug holes
  4. Drain cooling system and add antifreeze
  5. Remove battery and store in cool, dry location
  6. Clean and wax hull
  7. Cover vessel with breathable cover
  8. Store in dry, protected location

CAUTION! Failure to properly winterize may result in engine damage from freezing.

Safety Equipment

Required and recommended safety equipment for vessel operation.

EquipmentQuantityLocation
Personal Flotation Devices8Under seats
Fire Extinguisher2Helm and stern
Visual Distress Signals3 day/3 nightWaterproof container
Sound Producing Device1Helm station
Navigation LightsComplete setBow and stern
Anchor with Line1Bow storage
First Aid Kit1Console compartment

Regulatory Information

US Coast Guard Certified: Meets navigation rules and safety standards. Manufacturer: Mercury Marine. Hull Identification Number located on starboard transom. Compliance with Federal Boat Safety Act of 1971. For technical support, contact Mercury Marine Customer Service at 1-800-MERCURY or visit www.mercurymarine.com.

Troubleshooting

SymptomPossible CauseCorrective Action
Engine won't startDead battery, safety lanyard, fuel issueCheck battery charge, verify lanyard attached, check fuel supply
OverheatingWater pump, thermostat, blockageCheck water flow, inspect water pump, clear intake
Poor performanceFouled plugs, fuel filter, propeller damageReplace spark plugs, change fuel filter, inspect propeller
Electrical issuesCorroded connections, blown fusesClean battery terminals, check fuse panel
Steering stiffnessLow hydraulic fluid, air in systemCheck fluid level, bleed steering system
Excessive vibrationPropeller damage, engine alignmentInspect propeller, check engine alignment

Emergency: 1-800-MERCURY for 24/7 technical assistance

Service: Authorized Mercury Marine dealers nationwide

1986 Merc 350 Cruiser Manual © - All Rights Reserved 2025