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Home / Outboard Engines / Mercury Engines / Mercury 175 EFI

Mercury EFI 175 Specifications

Engine Model: Mercury EFI 175 Hp

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

Total Displacement: 153 cu.in (2507 cc)

Rated Engine Power: 175 Hp (130.5 kW) at 5750 rpm

Fuel System: Electronic fuel injection (EFI)

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General Technical Data

Engine Model .............. Mercury EFI 175 Hp
Engine Type .............. 2-stroke 6-cylinder gasoline outboard engine
Number of Cylinders .............. Six
Displacement, cu.in (cc) .............. 153 (2507)
Cylinder Bore, in (mm) .............. 3.50 (88.9)
Piston Stroke, in (mm) .............. 2.65 (67.3)
Maximum Engine Power, hp (kW) .............. 175.0 (130.5)
Maximum Engine Speed, rpm .............. 5250-5750
Idle Speed, rpm .............. 650±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 (Long Shaft), lbs (kg) .............. 425 (193)
Outboard Weight (X-Long Shaft), lbs (kg) .............. 434 (197)

Fuel System

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 Housing

Gear Ratio (Standard) .............. 1.87:1
Gear Ratio (High Altitude) .............. 2.00:1
Number of Teeth (Forward Gear, 1.87:1 Ratio) .............. 28
Number of Teeth (Reverse Gear, 1.87:1 Ratio) .............. 15
Number of Teeth (Forward Gear, 2.00:1 Ratio) .............. 28
Number of Teeth (Reverse Gear, 2.00:1 Ratio) .............. 14
Pinion Height, in (mm) .............. 0.025 (0.64)
Forward Gear Backlash (1.87:1 Ratio), in (mm) .............. 0.018-0.027 (0.460-0.686)
Forward Gear Backlash (2.00:1 Ratio), in (mm) .............. 0.015-0.022 (0.381-0.558)
Reverse Gear Backlash, in (mm) .............. 0.030-0.050 (0.762-1.27)
Water Pressure / RPM, psi (kPa) .............. 12 (82.2) / 5500

Mid Section

Transom Height (Long Shaft), in (mm) .............. 20 (510)
Transom Height (X-Long Shaft), in (mm) .............. 23 (585)
Power Trim (Total Tilt Range), deg .............. 75
Power Trim (Tilt Range), deg .............. 20
Tilt Pin Adjustment Positions .............. 5
Steering Pivot Range, deg .............. 60
Allowable Transom Thickness (Max), in (mm) .............. 2.37 (60.3)

Cylinder Block

Cylinder Block Type .............. V6, 2-cycle, loop charged
Cylinder Bore Type .............. Cast iron
Cylinder Compression, psi (kPa) .............. 110-135 (753-925)
Cylinder Bore Inside Diameter (Std), in (mm) .............. 3.501 (88.925)
Cylinder Bore Inside Diameter (Max), in (mm) .............. 3.503 (88.975)
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) .............. 3.494 (88.748)
Piston Outside Diameter (Wear Limit), in (mm) .............. 3.492 (88.697)
Reed Type .............. Steel
Reed Stand Open (Maximum), in (mm) .............. 0.02 (0.50)
Reed Stop .............. Not Adjustable

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