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Home / Outboard Engines / Mercury Engines / Mercury 150 EFI

Mercury EFI 150 Maintenance

Engine Model: Mercury EFI 150 Hp

Engine Type: 2-cycle 6-cylinder gasoline outboard engine

Total Displacement: 153 cu.in (2507 cc)

Rated Engine Power: 150 Hp (111.8 kW) at 5750 rpm

Fuel System: Electronic fuel injection (EFI)

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Fuel, Oil, Lubricant, and Filter

Engine Fuel Type .............. Unleaded 87 octane minimum
Engine Oil Type .............. Quicksilver TC-W3 2-cycle outboard oil
Engine Oil Capacity, gal (L) .............. 3.0 (11.4)
Lubricant Type .............. Quicksilver gear lube premium blend
Gearcase Capacity, qts (L) .............. 0.71 (0.67)
Fuel Filter/Water Separator Part Number .............. 35-18458Q4

Electronic Fuel Injection

Idle Mixture Screw .............. Not Adjustable
Low Idle Speed, rpm .............. 625±50
Wide Open Throttle, rpm .............. 5250-5750
Injector Resistance, ohms .............. 12.3±0.5
Electric Fuel Pump Resistance, ohms .............. 0.7±0.3
Electric Fuel Pump Amperage Draw, ohms .............. 4±0.5

Ignition System

Spark Plug Type .............. NGK BPZ8HS-10
Spark Plug Gap, in (mm) .............. 0.040 (1.0)
Idle Timing .............. Not adjustable, controlled by ECM
Maximum Timing .............. Not adjustable, controlled by ECM
Throttle Position Sensor .............. Not adjustable, controlled by ECM

Service Intervals

Lubricate all lubrication points .............. Every 100 hours
Inspect and clean spark plugs .............. Every 100 hours
Check fuel filter/water separator .............. Every 100 hours
Check carburetor adjustments .............. Every 100 hours
Check corrosion control anodes .............. Every 100 hours
Drain and replace gear case lubricant .............. Every 100 hours
Lubricate splines on the drive shaft .............. Every 100 hours
Inspect battery condition .............. Every 100 hours
Check EFI electrical system and ECM .............. Every 100 hours
Check final fuel filter .............. Every 100 hours
Check induction manifold leak .............. Every 100 hours
Check power trim fluid .............. Every 100 hours
Check and adjust carburetor .............. Every 100 hours
Check engine timing setup .............. Every 100 hours
Check control cable adjustments .............. Every 100 hours
Check tightness of bolts, nuts, and other fasteners .............. Every 100 hours
Replace water pump impeller .............. Every 100 hours
Replace fuel filter/water separator .............. Every 300 hours

Tightening Torques

Cylinder Block Cover Screw, Nm (ft-lb) .............. 23.5 (17.5)
Crankcase Cover Bolts, Nm (ft-lb) .............. 51.5 (38)
Exhaust Cover Bolts, Nm (ft-lb) .............. 20.3 (15)
Cylinder Head Bolts, Nm (ft-lb) .............. 40.5 (30)
Connecting Rod Bolts, Nm (ft-lb) .............. 40.5 (30)
Crankcase Cover Bolts, Nm (ft-lb) .............. 17 (12.6)
Fuel Pump Screw, Nm (ft-lb) .............. 8.1 (6.1)
Thermostat Screw, Nm (ft-lb) .............. 22.5 (16.5)
Crankshaft Drive Gear Screw, Nm (ft-lb) .............. 1.0 (0.75)
Steering Link Assembly, Nm (ft-lb) .............. 27 (20)
Drive Shaft Housing Nut, Nm (ft-lb) .............. 65 (48)
Gear Housing Screw, Nm (ft-lb) .............. 7 (5)
Electric Fuel Pump to Separator Cover, Nm (ft-lb) .............. 1.35 (1.0)
Separator Cover to Separator Tank, Nm (ft-lb) .............. 2.5 (1.9)
Induction Manifold Assembly to Engine, Nm (ft-lb) .............. 10 (7.5)
Oil Reservoir to Engine, Nm (ft-lb) .............. 3 (2.2)
Propeller Nut, Nm (ft-lb) .............. 75 (55)
Spark Plug, Nm (ft-lb) .............. 27 (20)

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