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| Home / Outboard Engines / Mercury Engines / Mercury 150 |
Mercury 150 Maintenance
| Engine Model: Mercury 150 Hp |
| Engine Type: 2-cycle 6-cylinder gasoline outboard engine |
| Total Displacement: 121.9 cu.in (1998 cc) |
| Rated Engine Power: 150 Hp (111.8 kW) at 5500 rpm |
| Fuel System: Carburetor with adjustable jet |
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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)
In-Line Fuel Filter Part Number .............. 35-877565T1
| Carburetor Adjustments |
Carburetor Model .............. WMH 31 or WMV 2/2A
Idle Mixture Screw .............. 1-1/2±1/8 turn
Float Level .............. Bowl Edge / Bowl Inverted
Main Jet Size (WMH 31), in (mm) .............. 0.062 (1.57)
Main Jet Size (WMV 2/2A), in (mm) .............. 0.074 (1.88)
Off-Idle Jet Size (WMH 31), in (mm) .............. 0.050 (1.27)
Idle Air Jet (WMH 31), in (mm) .............. 0.052 (1.32)
Idle Air Jet (WMV 2/2A), in (mm) .............. 0.034 (0.86) / 0.038 (0.97)
Vent Jet (WMH 31), in (mm) .............. 0.086 (2.18)
Vent Jet (WMV 2/2A), in (mm) .............. 0.086 (2.18)
Low Idle Speed, rpm .............. 650±50
Wide Open Throttle, rpm .............. 5000-5500
| Ignition System |
Spark Plug Type .............. NGK BU8H
Spark Plug Gap, in (mm) .............. 0.040 (1.0)
Maximum BTDC (Cranking Speed), deg .............. 21
Maximum BTDC (Wide Open Throttle), deg .............. 19
| Service Intervals |
Lubricate all lubrication points .............. Every 100 hours
Inspect and clean spark plugs .............. Every 100 hours
Check engine fuel filter .............. 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 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
| Tightening Torques |
Cylinder Block Cover Screw, Nm (ft-lb) .............. 23.5 (17.5)
Crankcase Cover Bolts, Nm (ft-lb) .............. 51.5 (38)
Exhaust Divider Plate Bolts, Nm (ft-lb) .............. 22.6 (16.7)
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)
Propeller Nut, Nm (ft-lb) .............. 75 (55)
Spark Plug, Nm (ft-lb) .............. 27 (20)
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| Engines Technical Specifications |