The Kohler Magnum M18 is a 691 cc, (42.2 cu·in) natural aspirated two-cylinders four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, for general-purpose applications.
Cylinder bore is 79.0 mm (3.11 in) and piston stroke is 70.0 mm (2.76 in). The compression ratio rating is 6.0:1. The Kohler M18 engine produced 18.2 PS (13.4 kW; 18.0 HP) at 3,600 rpm of maximum output power.
The Kohler M18 features:
- L-head design
- Electronic magneto ignition system
- Kohler or Walbro carburetor
- Centrifugal governor
- Full pressure lubrication system with oil filter
- Forced air cooling system
- Electric starter
General information
Engine Specifications | |
Engine model | Magnum M18 |
Engine type | 4-stroke, L-head, V-twin |
Displacement | 691 cm3, (42.2 cu·in) |
Max. horsepower | 18.2 PS (13.4 kW; 18 HP) at 3,600 rpm |
Max. torque | – |
Cooling system | Forced air |
Air cleaner | Replaceable, paper element |
Lubricating system | Full pressure with oil filter |
Ignition system | Electronic magneto ignition system |
Fuel system | Kohler or Walbro carburetor |
Fuel consumption | – |
Fuel tank capacity | – |
Fuel used | Gasoline (octane number 86 or higher) |
Starting system | Electric starter, 12V |
Governor | Centrifugal governor |
PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions (L x W X H) | 341 x 448 x 440 mm (13.4 x 17.6 x 17.3 in) |
Dry weight | 58.9 kg (129.9 lbs) |
Cylinder Block and Head
Cylinder block | |
Compression ratio: | 6.0:1 |
Cylinder bore: | 79.0 mm (3.11 in) |
Piston stroke: | 70.0 mm (2.76 in) |
Cylinder internal diameter (standard): | 79.050-79.075 mm (3.1122-3.1132 in) |
Piston skirt outer diameter (standard): | 78.944-78.961 mm (3.108-3.1087 in) |
Number of piston rings (compression / oil): | 2/1 |
Connecting rod small end diameter (standard): | 15.825-15.833 mm (0.623-0.6233 in) |
Piston pin diameter: | 15.805-15.810 mm (0.6222-0.6224 in) |
Side clearance (Top): | 0.1518 mm (0.006 in) |
Side clearance (Second): | 0.1518 mm (0.006 in) |
Ring end gap (Top): | 0.2530-0.5820 mm (0.01-0.0229 in) |
Ring end gap (Second): | 0.2530-0.5820 mm (0.01-0.0229 in) |
Crankshaft main journal diameter: | 44.052-44.078 mm (1.7343-1.7354 in) |
Crankpin journal diameter: | 34.744-34.757 mm (1.3679-1.3684 in) |
Crankshaft center distance: | 35 mm (1.38 in) |
Cylinder head | |
Valve arrangement: | L-head |
Valves: | 2,(4 valves in total) |
Valve steam diameter (INTAKE): | 7.8506 mm (0.3091 in) |
Valve steam diameter (EXHAUST): | 7.8126 mm (0.3076 in) |
Valve Minimum Lift-Zero Lash (INTAKE): | 6.9 mm (0.274 in) |
Valve Minimum Lift-Zero Lash (EXHAUST): | 6.9 mm (0.274 in) |
Valve Guide I.D. (Max. Wear) (INTAKE): | 0.1265 mm (0.005 in) |
Valve Guide I.D. (Max. Wear) (EXHAUST): | 0.1771 mm (0.007 in) |
Nominal Valve Seat Angle (earlier): | 45° |
Nominal Valve Seat Angle (later): | 30° |
Tightening torque settings:
- Cylinder Head: 20.0-27.0 Nm; 15.0-20.0 ft·lb;
- Connecting Rods (New): 16.0 Nm; 12.0 ft·lb;
- Connecting Rods (Used): 11.0 Nm; 8.3 ft·lb;
- Flywheel Screw: 54.0 Nm; 40.0 ft·lb;
- Manifold Screw/Nut: 17 Nm; 12.5 ft·lb;
- Fuel Pump Mounting Screws: 4.2-5.1 Nm; 3.1-3.8 ft·lb
- Ignition Module: 3.6 Nm; 2.7 ft·lb
- Spark Plugs: 18 Nm; 13.3 ft·lb
- Oil Filter: 5.7-9.1 Nm; 4.2-6.7 ft·lb
- Closure Plate: 17.0 Nm; 12.5 ft·lb
Service Data
Valve clearance | |
Intake valve clearance: | 0.076-0.152 mm (0.003-0.006 in) |
Exhaust valve clearance: | 0.278-0.354 mm (0.011-0.014 in) |
Oil system | |
Lubrication system: | Full pressure with oil filter |
Oil filter | Full-flow type |
Oil type: | SF or SG |
Recommended oil: | 5W-20, 5W-30, 10W-30, 10W-40 |
Oil capacity: |
With oil filter: 1.6 L (1.69 US. qt, 1.41 Imp. qt.) W/o oil filter: 1.4 L (1.48 US. qt, 1.23 Imp. qt.) |
Oil pressure: | More then 3.5 kg/cm2, 50 psi |
Fuel system | |
Fuel pump type | Mechanical |
Fuel filter type | In-line |
Type: | Kohler or Walbro carburetor |
Main fuel: |
Kohler: 2-1/2 turns Walbro (fixed jet): Not adjust Walbro (adjustable jet): 1-1/4 turns |
Low idle: |
Kohler: 1 turn Walbro: 1-1/4 turns |
Ignition system | |
Type: | Electronic magneto ignition system |
Spark plug: | Champion RV17YC |
Spark plug gap: | 0.89 mm (0.035 in) |
Spark plug torque: | 18 N·m (1.8 kg·m, 13.3 ft·lb) |
Ignition coil air gap | 0.2-0.3 mm (0.0079-0.0118 in) |
Applications
Manufacturer or Brand | Models |
Lawn tractors | |
Cub Cadet | 1535, 1541, 1806, 1810, 1811, 1812, 1861, 1862 |
Massey Ferguson | 318GTX |
References
1. Kohler Magnum M8, M10, M12, M14, M16 single cylinder engine service manual. Kohler Co.
We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.
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