Mercury 250 EFI Saltwater specs
| Engine Model: Mercury Saltwater 250 Hp |
| Engine Type: 2-stroke 6-cylinder gasoline outboard engine |
| Total Displacement: 185.9 cu.in (3047 cc) |
| Rated Engine Power: 250 Hp (186.5 kW) at 5800 rpm |
| Fuel System: Electronic fuel injection (EFI) |
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Engine Model .............. Mercury EFI 250 Hp Saltwater
Engine Type .............. 2-stroke 6-cylinder gasoline outboard engine
Number of Cylinders .............. Six
Displacement, cu.in (cc) .............. 185.9 (3047)
Cylinder Bore, in (mm) .............. 3.63 (92.1)
Piston Stroke, in (mm) .............. 3.00 (76.2)
Maximum Engine Power, hp (kW) .............. 250.0 (186.5)
Maximum Engine Speed, rpm .............. 5000-5800
Idle Speed, rpm .............. 625±50
Firing Order .............. 1-2-3-4-5-6
Oil Injection Pump .............. variable metering pump
Ignition System .............. Digital inductive
Starting System .............. Electric Starter
Electrical System Rating, Volts .............. 12
Charging System .............. Alternator
Alternator Rating, Amps .............. 52-60
Outboard Weight (20" Shaft), lbs (kg) .............. 458 (208)
Outboard Weight (25" Shaft), lbs (kg) .............. 463 (210)
Outboard Weight (30" Shaft), lbs (kg) .............. 479 (217)
Fuel System Type .............. Electronic fuel injection (EFI)
Number of Injectors .............. 6
Fuel Pump Type .............. Diaphragm
Fuel Filter Type .............. Water separator
Engine Control .............. Electronic
Fuel Type .............. Gasoline with oil injection
Recommended Gasoline .............. Unleaded gasoline (87 octane minimum)
Recommended Oil .............. Quicksilver or Mercury Precision Lubricants TC-W3
Operating Fuel/Oil Ratio .............. 50:1
Injector Line Pressure, psi (kPa) .............. 41-45 (283-310)
Gear Ratio (Standard) .............. 1.75:1
Gear Ratio (High Altitude) .............. 1.87:1
Number of Teeth (Forward Gear, 1.75:1 Ratio) .............. 21
Number of Teeth (Reverse Gear, 1.75:1 Ratio) .............. 12
Number of Teeth (Forward Gear, 1.87:1 Ratio) .............. 28
Number of Teeth (Reverse Gear, 1.87:1 Ratio) .............. 15
Pinion Height, in (mm) .............. 0.025 (0.64)
Forward Gear Backlash , in (mm) .............. 0.017-0.028 (0.43-0.71)
Reverse Gear Backlash (Standard Rotation), in (mm) .............. 0.028-0.052 (0.71-1.32)
Reverse Gear Backlash (Counter Rotation), in (mm) .............. 0.040-0.060 (1.00-1.52)
Water Pressure / RPM, psi (kPa) .............. 8-10 (55-69) / 5000
Transom Height (Long Shaft), in (mm) .............. 20 (510)
Transom Height (Long Shaft), in (mm) .............. 25 (635)
Transom Height (Long Shaft), in (mm) .............. 30 (762)
Power Trim (Total Tilt Range), deg .............. 75
Power Trim (Tilt Range), deg .............. 20
Tilt Pin Adjustment Positions .............. 5
Steering System ................ Tiller handle or remote control
Steering Pivot Range, deg .............. 60
Allowable Transom Thickness (Max), in (mm) .............. 2.37 (60.3)
Cylinder Block Type .............. V6, 2-cycle, loop charged
Cylinder Bore Type .............. Cast iron
Cylinder Compression, psi (kPa) .............. 90-110 (616-754)
Cylinder Bore Inside Diameter (Std), in (mm) .............. 3.625 (92.075)
Cylinder Bore Inside Diameter (Max), in (mm) .............. 3.628 (92.151)
Cylinder Bore (Max Out of Round), in (mm) .............. 0.003 (0.076)
Cylinder Bore (Max Taper), in (mm) .............. 0.003 (0.076)
Crankshart Runout (Maximum), in (mm) .............. 0.006 (0.152)
Piston Type .............. Aluminum
Piston Outside Diameter (Std), in (mm) .............. 3.621 (91.973)
Piston Outside Diameter (Wear Limit), in (mm) .............. 3.626 (92.101)
Ring End Gap, in (mm) .............. 0.010 -0.018 (0.25-0.46)
Reed Type .............. Steel
Reed Stand Open (Maximum), in (mm) .............. 0.02 (0.50)
Reed Stop .............. Not Adjustable
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) .............. 0.88 (0.83)
Fuel Filter/Water Separator Part Number .............. 35-18458A4
Idle Mixture Screw .............. Not Adjustable
Low Idle Speed, rpm .............. 625±50
Wide Open Throttle, rpm .............. 5000-5800
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
Spark Plug Type .............. Champion QL77CC
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
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 300 hours
Replace fuel filter/water separator .............. Every 300 hours
Cylinder Block Cover Screw, Nm (ft-lb) .............. 29 (21)
Crankcase Cover Bolts, Nm (ft-lb) .............. 40.5 (30)
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)
Relief Valve Cover Bolts, Nm (ft-lb) .............. 27 (20)
Intake Manifold Bolts, Nm (ft-lb) .............. 11.3 (8.4)
Fuel Pump Screw, Nm (ft-lb) .............. 6.0 (4.4)
Thermostat Screw, Nm (ft-lb) .............. 22.5 (16.5)
Steering Link Assembly, Nm (ft-lb) .............. 27 (20)
Drive Shaft Housing Nut, Nm (ft-lb) .............. 74 (55)
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) .............. 20 (15)
Propeller Nut, Nm (ft-lb) .............. 75 (55)
Spark Plug, Nm (ft-lb) .............. 27 (20)
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