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Kohler Magnum M18 Specs
The Kohler M18 is a 691 cc (41.2 cubic inches) two-cylinder air-cooled
four-stroke internal combustion gasoline engine from the Magnum-series,
manufactured by Kohler Co.
The Kohler M18 engine has an L-head (side valve) design and a horizontal
PTO shaft. The engine is equipped with the Kohler or Walbro-build
carburetor and an electronic magneto ignition system. The M18 engine
used a high-density paper air cleaner.
The cylinder bore is 79.0 mm (3.11 in) and the piston stroke is 70.0 mm
(2.76 in). The compression ratio rating is 6.0:1. The engine produced
18.2 PS (13.4 kW; 18.0 HP) at 3,600 rpm of horsepower.
Engine code identification:
M - M-series,
18 - horsepower,
S - Electric starter,
Q - Quilet model.
| General Technical Data |
Engine Model .............. Kohler Magnum M18/M18S
Engine Type .............. 4-cycle twin cylinder air-cooled gasoline
Number of Cylinders .............. 2
Displacement, cc (cu.in) .............. 691.3 (42.2)
Engine Bore, mm (in) .............. 79 (3.12)
Engine Stroke, mm (in) .............. 70 (2.75)
Rated Engine Power, hp (kW) .............. 18.0 (13.4)
Rated Engine Speed, rpm .............. 3600
Idle Speed, rpm .............. 1200
Compression .............. 6.0:1
Lubrication .............. Full pressure
Oil filter .............. Full-flow type
Air Cleaner .............. Replaceable, paper element
Ignition Type .............. Electronic
Electrical System Rating, Volts .............. 12
Starter Type .............. Electric
| Fuel System |
Fuel System Type .............. Carburetor
Carburetor Model .............. Kohler or Walbro
Carburetor Type .............. Adjustable main jet or fixed jet
Fuel Pump Type .............. Mechanical
Fuel Filter Type .............. In-line
Governor Type .............. Mechanical
| Dimensions and Weight |
Length, mm (in) .............. 341 (13.5)
Width, mm (in) .............. 448 (17.7)
Height, mm (in) .............. 440 (17.4)
Net weight, kg (lbs) .............. 59.0 (130)
| Cylinder Block |
Cylinder Bore Inside Diameter (Std), mm (in) .............. 79,075-79,050 (3,1255-3,1245)
Cylinder Bore Inside Diameter (Max. Wear Limit), mm (in) .............. 79,1384 (3,128)
Cylinder Bore (Max Out of Round), mm (in) .............. 0,0506 (0,002)
Cylinder Bore (Max. Taper), mm (in) .............. 0,03795 (0,0015)
Camshaft End Play, mm (in) .............. 0,0759-0,3289 (0,003-0,013)
Connecting Rod to Crankpin Clearance (Std), mm (in) .............. 0,0304-0,0608 (0,0012-0,0024)
Connecting Rod to Crankpin Clearance (Wear Limit), mm (in) .............. 0,07337 (0,0029)
Connecting Rod to Piston Pin Clearance (Std), mm (in) .............. 0,0152-0,0278 (0,0006-0,0011)
Connecting Rod Small End I.D. (Std), mm (in) .............. 15,825-15,833 (0,6255-0,6258)
| Cylinder Head and Valves |
Cylinder Head (Max. Out of Flatness), mm (in) .............. 0,0759 (0,003)
Intake Valve Clearance, mm (in) .............. 0,08-0,16 (0,003-0,006)
Exhaust Valve Clearance, mm (in) .............. 0,28-0,35 (0,011-0,014)
Valves Guide Reamer Size, mm (in) .............. 7,90625 (0,3125)
Intake Valve Tappet Clearance (Cold), mm (in) .............. 0,076-0,152 (0,003-0,006)
Exhaust Valve Tappet Clearance (Cold), mm (in) .............. 0,278-0,354 (0,011-0,014)
Intake Valve Minimum Lift (Zero Lash), mm (in) .............. 6,9322 (0,274)
Exhaust Valve Minimum Lift (Zero Lash), mm (in) .............. 6,9322 (0,274)
Intake Valve Stem O.D (Minimum), mm (in) .............. 7,85059 (0,3103)
Exhaust Valve Stem O.D (Minimum), mm (in) .............. 7,81264 (0,3088)
Nominal Valve Seat Angle (earlier), deg .............. 45
Nominal Valve Seat Angle (later), deg .............. 30
Intake Valve Guide I.D (Max. Wear), mm (in) .............. 0,1265 (0,005)
Exhaust Valve Guide I.D (Max. Wear), mm (in) .............. 0,1771 (0,007)
| Piston and Piston Rings |
Piston Thrust Face O.D (Std), mm (in) .............. 78,961-78,944 (3,1210-3,1203)
Piston Thrust Face O.D (Max. Wear Limits), mm (in) .............. 78,8879 (3,1181)
Piston Thrust Face to Bore Clearance (Std), mm (in) .............. 0,0886-0,1312 (0,0035-0,0052)
Piston Ring End Gap (Std Bore), mm (in) .............. 0,253-0,582 (0,010-0,023)
Piston Ring End Gap (Used Bore), mm (in) .............. 0,8096 (0,032)
Max. Piston Ring Side Clearance, mm (in) .............. 0,1518 (0,006)
Piston Pin Outside Diameter, mm (in) .............. 15,805-15,810 (0,6247-0,6249)
| Crankshaft |
Crankshaft End O.D (Std), mm (in) .............. 44,052-44,078 (1,7412-1,7422)
Crankshaft End O.D (Max Wear Limit), mm (in) .............. 44,03971 (1,7407)
Crankshaft Max. Out of Round (Sleeve), mm (in) .............. 0,01265 (0,0005)
Crankshaft Max. Taper (Sleeve), mm (in) .............. 0,0253 (0,001)
Crankshaft Main Running Clearance (Max Std), mm (in) .............. 0,12397 (0,0049)
Crankshaft Main Running Clearance (Wear Limit), mm (in) .............. 0,14927 (0,0059)
Crankshaft Main Bearing I.D (Installed), mm (in) .............. 44,121-44,176 (1,7439-1,7461)
Crankpin O.D (Std), mm (in) .............. 34,757-34,744 (1,3738-1,3733)
Crankpin O.D (Max. Wear Limit), mm (in) .............. 34,73184 (1,3728)
Crankpin (Max. Out of Round), mm (in) .............. 0,01265 (0,0005)
Crankpin (Max. Taper), mm (in) .............. 0,0253 (0,001)
Crankshaft End Play, mm (in) .............. 0,051-0,354 (0,002-0,014)
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