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Kohler CV173 Engine

The Kohler CV173 is a four-cycle single cylinder overhead valve vertical shaft air-cooled small gasoline engine from Command PRO series. A 10.6 cubic inches (0.17 L) engine has a cylinder bore of 2.75" (70 mm), piston stroke of 1.80" (45 mm), and rated power of 5.5 Hp (4 kW) at 3600 rpm. The compression ratio rating is 8.0:1. The Kohler CV173 engine is equipped with a fixed main jet carburetor, full-pressure lubrication system, electronic magneto ignition, paper air filter, and starting system with recoil starter. The operating weight is 36 lbs (16.5 kg).

General Technical Data

Engine Specifications

Engine Model .................. Kohler Command PRO CV173
Engine Type .................. 4-cycle OHV single cylinder air-cooled gasoline
Number of Cylinders .................. 1
Displacement, cc (cu.in) .................. 173 (10.6)
Cylinder Bore, mm (in) .................. 70.0 (2.75)
Piston Stroke, mm (in) .................. 45.0 (1.80)
Rated Engine Power, hp (kW) .................. 5.5 (4.0)
Rated Engine Speed, rpm .................. 3600
Maximum Torque, Nm (ft-lbs) .................. 10.5 (7.8)
Torque Speed, rpm .................. 2600
Compression Ratio .................. 8.0:1
Lubrication System .................. Full-pressure
Cooling System .................. Forced-air
Air Cleaner Type .................. Replaceable, paper element
Ignition System .................. Dependable electronic magneto
Starter Type .................. Recoil
Electrical System Rating, Volts .................. 12

Fuel System

Fuel System Type .................. Carburetor
Carburetor Type .................. Fixed main jet
Fuel Filter Type .................. In-line
Governor Type .................. Mechanical

Dimensions and Weight

Overall Length, mm (in) .................. 434 (17.1)
Overall Width, mm (in) .................. 354 (13.9)
Overall Height, mm (in) .................. 280 (11.1)
Net Weight, kg (lbs) .................. 16.5 (36.3)

Maintenance Data

Engine Oil

Engine Oil Type (Summer Time) .................. SAE 10W-30
Engine Oil Type (Winter Time) .................. SAE 5W-20, 5W-30
Engine Oil Classification (API Service) .................. SJ or higher
Engine Oil Capacity, L (qts) .................. 0.60 (0.63)

Ignition System

Spark Plug Type .................. Kohler 1413214-S
Spark Plug Gap, mm (in) .................. 0.76 (0.030)
Module Air Gap, mm (in) .................. 0.254 (0.010)
Thread Size, mm (in) .................. 14 (0.55)
Spark Plug Torque, Nm (ft-lb) .................. 27 (20)

Service Specifications

Cylinder Block

Cylinder Bore I.D (Standard) .................. 70.000-70.020 mm (2.7550-2.7560 in)
Cylinder Bore I.D (Max Out of Round) .................. 0.0127 mm (0.0005 in)
Thrust Face O.D .................. 69.960-69.980 mm (2.7543-2.7551 in)
Crankshaft End Play (Free) .................. 0.427-1.298 mm (0.0168-0.05110 in)
Crankshaft Bearing Journal O.D (flywheel) .................. 25.005-25.019 mm (0.9844-0.9850 in)
Crankshaft Bearing Journal O.D (PTO) .................. 26.95-26.97 mm (1.061-1.062 in)
Connecting Rod Journal O.D .................. 25.985-25.995 mm (1.0230-1.0234 in)
Connecting Rod to Crankpin Running Clearance .................. 0.025-0.045 mm (0.0009-0.0017 in)
Connecting Rod to Crankpin Side Clearance .................. 0.03-0.48 mm (0.00118-0.0189 in)
Piston Pin O.D (Standard) .................. 12.990-12.996 mm (0.5114-0.5116 in)
Top Compression Ring Groove Clearance .................. 0.010-0.020 mm (0.0004-0.0008 in)
Second Compression Ring Groove Clearance .................. 0.010-0.020 mm (0.0004-0.0008 in)
Top Compression Ring End Gap .................. 0.100-0.250 mm (0.0039-0.0098 in)
Second Compression Ring End Gap .................. 0.300-0.500 mm (0.0118-0.0197 in)

Cylinder Head and Valves

Cylinder Head (Max Out of Flatness) .................. 0.08 mm (0.003 in)
Intake Valve Clearance .................. 0.0762-0.1270 mm (0.0030-0.0050 in)
Exhaust Valve Clearance .................. 0.0762-0.1270 mm (0.0030-0.0050 in)
Intake Valve Head Diameter .................. 25.875-26.125 mm (1.0187-1.0285 in)
Exhaust Valve Head Diameter .................. 23.875-24.125 mm (0.9399-0.9498 in)
Intake Valve Stem O.D (Standard) .................. 5.465-5.480 mm (0.2152-0.2157 in)
Exhaust Valve Stem O.D (Standard) .................. 5.465-5.480 mm (0.2152-0.2157 in)
Intake Valve Stem to Valve Guide Clearance .................. 0.020-0.047 mm (0.0007-0.0018 in)
Exhaust Valve Stem to Valve Guide Clearance .................. 0.055-0.082 mm (0.0021-0.0032 in)
Intake Valve Guide Inside Diameter .................. 5.500/5.512 mm (0.2165/0.2170 in)
Exhaust Valve Guide Inside Diameter .................. 5.500/5.512 mm (0.2165/0.2170 in)
Camshaft End Play .................. 0.30-0.85 mm (0.0118-0.0335 in)
Camshaft Clearance .................. 0.013-0.0555 mm (0.00051-0.00217 in)

Tightening Torque Specs

Cylinder Head Nut, Nm (in-lb) .................. 13-25.7 (115-227)
Connecting Rod Screw, Nm (in-lb) .................. 12.5 (111)
Flywheel Retaining Nut, Nm (ft-lb) .................. 51.5 (38.1)
Rocker Arm Stud, Nm (in-lb) .................. 13.6 (120)
Ignition Module, Nm (in-lb) .................. 10 (89)
Spark Plug, Nm (ft-lb) .................. 27 (20)
Governor Lever Nut, Nm (in-lb) .................. 9.5 (24)
Muffler Exhaust Nut, Nm (in-lb) .................. 9.5 (84)

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