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Kohler Command CH670 Specs
The Kohler CH670 is a 674 cc, (41.0 cubic inches) V-twin air-cooled four-stroke
internal combustion gasoline engine from the Command PRO series,
manufactured by Kohler Co.
The Kohler CH670 engine has an OHV (overhead valve) design, an aluminum
block with cast iron cylinder liners, a horizontal PTO-shaft,
pressurized lubricating system. The engine is equipped with a carburetor
(Nikki or Keihin) with a fixed main jet and one of these ignition
systems: CDI/MDI, ASAM/DSAM, DSAI (Digital Spark Advance Ignition).
The cylinder bore and the piston stroke are 80.0 mm (3.15 in) and 67.0
mm (2.64 in), respectively. Compression ratio rating is 8.5:1.
The Kohler CH670 engine produced 22.3 PS (16.4 KW; 22.0 HP) at 3,600 rpm
of horsepower and 51.8 Nm (5.28 kgm; 38.23 ft-lb) at 2,200 rpm of
maximum torque.
Engine code identification:
C - Command series,
H - Horizontal PTO shaft,
670 - Displacement (cc).
| General Technical Data |
Engine Model .................. Kohler Command CH670
Engine Type .................. 4-cycle horizontal shaft V-Twin air-cooled gasoline
Number of Cylinders .................. 2
Displacement, cc (cu.in) .................. 674 (41.1)
Cylinder Bore, mm (in) .................. 80.0 (3.15)
Piston Stroke, mm (in) .................. 67.0 (2.64)
Rated Engine Power, hp (kW) .................. 22.0 (16.4)
Rated Engine Speed, rpm .................. 3600
Maximum Torque, Nm (ft-lbs) .................. 49.1 (36.2)
Torque Speed, rpm .................. 2400
Compression Ratio .................. 8.5:1
Lubrication System .................. Full pressure
Oil Filter .................. Full-flow type
Air Cleaner .................. Replaceable, paper element
Oil Capacity, L (qts) .................. 1.8 (1.9)
Electrical System Rating, Volts .................. 12
Starter Type .................. Electric
| Fuel System |
Fuel System Type .................. Carburetor
Carburetor Model .................. Keihin
Carburetor Type .................. One-Barrel, fixed main jet
Fuel Pump Type .................. Pulse/mechanical
Fuel Filter Type .................. In-line
Governor Type .................. Mechanical
| Dimensions and Weight |
Overall Length, mm (in) .................. 350 (14.0)
Overall Width, mm (in) .................. 450 (17.7)
Overall Height, mm (in) .................. 480 (19.0)
Net Weight, kg (lbs) .................. 41 (90)
| Cylinder Block |
Cylinder Bore I.D (Standard), mm (in) .................. 80.000-80.025 (3.1496-3.1506)
Cylinder Bore I.D (Wear Limit), mm (in) .................. 80.065 (3.1522)
Cylinder Bore (Max Out of Round), mm (in) .................. 0.12 (0.0047)
Cylinder Bore Max Taper, mm (in) .................. 0.05 (0.0020)
Crankshaft End Play (Free), mm (in) .................. 0.070-0.590 (0.0028-0.0230)
Crankshaft Bore (Crankcase), mm (in) .................. 40.965-41.003 (1.6128-1.6143)
Crankshaft Bore (Closure Plate), mm (in) .................. 40.987-40.974 (1.6136-1.6131)
Crankshaft Bore to Crankshaft Clearance, mm (in) .................. 0.039-0.074 (0.0015-0.0029)
Crankshaft Bearing Journal O.D (Flywheel), mm (in) .............. 40.913-40.935 (1.6107-1.6116)
Crankshaft Bearing Journal Max Taper (Flywheel), mm (in) .................. 0.022 (0.0009)
Crankshaft Bearing Journal O.D (Closure Plate), mm (in) .......... 40.913-40.935 (1.6107-1.6116)
Crankshaft Bearing Journal Max Taper (Closure Plate), mm (in) .................. 0.022 (0.0009)
Crankshaft T.I.R (PTO End, Crank in Engine), mm (in) .................. 0.279 (0.0110)
Crankshaft T.I.R (Entire Crank, in V-Blocks), mm (in) .................. 0.10 (0.0039)
Connecting Rod Journal O.D, mm (in) .................. 35.955-35.973 (1.4156-1.4163)
Connecting Rod Journal Max Taper, mm (in) .................. 0.018 (0.0007)
Connecting Rod to Crankpin Clearance, mm (in) .................. 0.030-0.055 (0.0012-0.0022)
Connecting Rod to Crankpin Side Clearance, mm (in) .................. 0.26-0.63 (0.0102-0.0248)
Connecting Rod to Piston Pin Clearance, mm (in) .................. 0.015-0.028 (0.0006-0.0011)
| Cylinder Head and Valves |
Cylinder Head (Max Out of Flatness), mm (in) .................. 0.076 (0.003)
Hydraulic Valve Lifter to Crankcase Clearance, mm (in) .................. 0.0241-0.0501 (0.0009-0.0020)
Intake Valve Stem to Valve Guide Clearance, mm (in) .................. 0.038-0.076 (0.0015-0.0030)
Exhaust Valve Stem to Valve Guide Clearance, mm (in) .................. 0.050-0.088 (0.0020-0.0035)
Intake Valve Guide I.D, mm (in) .................. 7.038-7.058 (0.2771-0.2779)
Exhaust Valve Guide I.D, mm (in) .................. 7.038-7.058 (0.2771-0.2779)
Valve Guide Reamer Size (Standard), mm (in) .................. 7.048 (0.2775)
Valve Guide Reamer Size (0.25 Oversize), mm (in) .................. 7.298 (0.2873)
Intake Valve Minimum Lift, mm (in) .................. 8.07 (0.3177)
Exhaust Valve Minimum Lift, mm (in) .................. 8.07 (0.3177)
Nominal Valve Face Angle, degrees .................. 45
Valve Seat Angle (Intake/Exhaust), degrees .................. 89
Intake Valve Insert O.D, mm (in) .................. 36.987-37.013 (1.4562-1.4572)
Exhaust Valve Insert O.D, mm (in) .................. 32.987-33.013 (1.2987-1.2997)
Intake Valve Guide Depth, mm (in) .................. 4.00 (0.1575)
Exhaust Valve Guide Depth, mm (in) .................. 6.50 (0.2559)
Intake Valve Head Diameter, mm (in) .................. 33.37-33.63 (1.3138-1.3240)
Exhaust Valve Head Diameter, mm (in) .................. 29.37-29.63 (1.1563-1.1665)
Intake Valve Stem Diameter, mm (in) .................. 6.982-7.000 (0.2749-0.2756)
Exhaust Valve Stem Diameter, mm (in) .................. 6.970-6.988 (0.2744-0.2751)
Camshaft End Play, mm (in) .................. 0.076-0.127 (0.0030-0.0050)
Camshaft Clearance, mm (in) .................. 0.025-0.063 (0.0010-0.0025)
Camshaft Bore I.D, mm (in) .................. 20.000-20.025 (0.7874-0.7884)
Camshaft Bearing Surface O.D, mm (in) .................. 19.962-19.975 (0.7859-0.7864)
| Piston and Piston Rings |
Piston to Piston Pin Clearance, mm (in) .................. 0.006-0.017 (0.0002-0.0007)
Piston Pin Bore I.D, mm (in) .................. 17.006-17.012 (0.6695-0.6698)
Piston Pin O.D, mm (in) .................. 16.995-17.000 (0.6691-0.6693)
Top Ring Groove Clearance, mm (in) .................. 0.030-0.076 (0.0012-0.0030)
Second Ring Groove Clearance, mm (in) .................. 0.030-0.076 (0.0012-0.0030)
Oil Ring Groove Clearance, mm (in) .................. 0.046-0.196 (0.0018-0.0077)
Top Ring End Gap, mm (in) .................. 0.18-0.46 (0.0071-0.0181)
Second Ring End Gap, mm (in) .................. 0.18-0.46 (0.0071-0.0181)
Piston O.D (Standard), mm (in) .................. 79.963-79.979 (3.1481-3.1488)
Piston O.D (Wear Limit), mm (in) .................. 79.831 (3.1430)
Piston to Cylinder Bore Clearance, mm (in) .................. 0.021-0.062 (0.0008-0.0024)
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