Kohler CH1000

Kohler CH1000The Kohler CH1000 is a 999 cc (61.0 cu·in) natural aspirated V-twin four-stroke air-cooled internal combustion small gasoline engine from the Command PRO series with a horizontal shaft, manufactured by Kohler Co for general-purpose applications.

A 90.0 mm (3.54 in) cylinder bore and 78.5 mm (3.09 in) piston stroke give the CH1000 engine a total of 999 cc of displacement. The compression ratio rating is 8.8:1.

The CH1000 engine produced 37.5 PS (27.6 KW; 37.0 HP) at 3,600 rpm of maximum horsepower and 75.0 Nm (7.6 kg·m; 55.3 ft·lb) at 3,400 rpm of maximum torque.

The Kohler CH1000 features:

  • OHV design
  • Hydraulic valve lifters
  • Aluminum cylinder block
  • Cast iron cylinder liners
  • Extra-large sleeve bearings
  • CDI/MDI or Digital Spark Advance Ignition (DSAI) ignition systems
  • Two-barrel, side-draft carburetor with fixed main jets
  • Mechanical centrifugal governor
  • Full pressure lubrication system
  • Forced air cooling system
  • Electric starter
  • 20 amp charging system (15 amp stator with a 25 amp rectifier-regulator)

General information

Engine Specifications
Engine modelCommand PRO CH1000
Engine type4-stroke, OHV, V-twin
Displacement999 cm3, (61.0 cu·in)
Max. horsepower 37.5 PS (27.6 KW; 37.0 HP) at 3,600 rpm
40.5 PS (29.8 KW; 40.0 HP) at 3,600 rpm
Max. torque75.0 Nm (7.6 kg·m; 55.3 ft·lb) at 3,400 rpm
Cooling systemForced air
Air cleanerHigh-efficiency, heavy-duty air filters
Lubricating systemFull pressure
Ignition systemCDI/MDI or Digital Spark Advance Ignition (DSAI) ignition systems
Fuel systemTwo-barrel, side-draft carburetor with fixed main jets
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemElectric starter
GovernorMechanical centrifugal governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)388 x 484 x 699 mm (15.3 x 19.0 x 27.5 in)
Dry weight59.0 kg (132.0 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:8.8:1
Cylinder bore:90.0 mm (3.54 in)
Piston stroke:78.5 mm (3.09 in)
Cylinder internal diameter (standard):90.000-90.0025 mm (3.5433-3.5434 in)
Number of piston rings (compression / oil):2/1
Connecting rod big end diameter (standard):44.030-44.037 mm (1.7335-1.7337 in)
Piston style A
Thrust face outer diameter (standard):89.953-89.967 mm (3.5414-3.542 in)
Piston pin outer diameter (standard):18.995-19.000 mm (0.7478-0.7480 in)
Side clearance (Top):0.040-0.080 mm (0.0016-0.0031 in)
Side clearance (Second):0.040-0.080 mm (0.0016-0.0031 in)
Side clearance (Oil):0.030-0.190 mm (0.0012-0.0075 in)
Ring end gap (Top):0.300-0.550 mm (0.0118-0.0217 in)
Ring end gap (Second):0.300-0.550 mm (0.0118-0.0217 in)
Piston style B
Thrust face outer diameter (standard):89.972 mm (3.5422 in)
Piston pin outer diameter (standard):19.995-20.000 mm (0.7872-0.7874 in)
Side clearance (Top):0.030-0.070 mm (0.0010-0.0026 in)
Side clearance (Second):0.030-0.070 mm (0.0010-0.0026 in)
Side clearance (Oil):0.060-0.190 mm (0.0022-0.0073 in)
Ring end gap (Top):0.125-0.304 mm (0.0049-0.0120 in)/td>
Ring end gap (Second):0.900-1.179 mm (0.0345-0.0464 in)
Crankshaft
Crankshaft main journal diameter:44.978-45.000 mm (1.7708-1.7717 in)
Crankpin journal diameter:43.982-44.000 mm (1.7316-1.7323 in)
Cylinder head
Valve arrangement:OHV, gear driven
Valves:2 (4 valves in total)
Valve head diameter (INTAKE):38.625-38.685 mm (1.5207-1.523 in)
Valve head diameter (EXHAUST):31.625-31.825 mm (1.2451-1.253 in)
Valve seat angle (INTAKE):89°
Valve seat angle (EXHAUST):89°
Valve seat angle (INTAKE):45°
Valve seat angle (EXHAUST):45°
Valve steam diameter (INTAKE):6.982-7.000 mm (0.2749-0.2756 in)
Valve steam diameter (EXHAUST):6.970-6.988 mm (0.2744-0.2751 in)
Camshaft lobe height (INTAKE):34.100 mm (1.3425 in)
Camshaft lobe height (EXHAUST):35.000 mm (1.378 in)
Camshaft journal diameter:19.962-19.975 mm (0.7859-0.7864 in)

Tightening torque specs

Tightening torque specs
Intake manifold mounting (torque in 2 increments) Step 1: 16.9 Nm (1.7 kgf·m; 12.5 lb·ft)
Step 2: 22.6 Nm (2.3 kgf·m; 16.7 lb·ft)
Connecting rod cap11.0 Nm (1.1 kgf·m; 8.1 lb·ft)
Cylinder head Bolt (torque in 2 increments):
Step 1: 23.7 Nm (2.4 kgf·m; 17.5 lb·ft)
Step 2: 46.9 Nm (4.8 kgf·m; 34.6 lb·ft)
Fan10.4 Nm (1.1 kgf·m; 7.7 lb·ft)
Flywheel69.8 Nm (7.1 kgf·m; 51.5 lb·ft)
Governor lever nut7.1 Nm (0.7 kgf·m; 5.2 lb·ft)
Muffler retaining nuts24.4 Nm (2.5 kg·m; 18.0 ft·lb)
Spark plug27 Nm (2.75 kg·m; 20.0 ft·lb)

Service Data

Engine
Maximum speed:3600±50 rpm
Idle speed:1200±75 rpm
Compression pressure
Standard:1.1 MPa (160 psi)
Compression differential limit between cylinders:15% and less
Oil system
Lubrication system:Full pressure
Oil type:API SJ or higher
Recommended oil:SAE 10W-30, KOHLER PRO 10W-50
Oil capacity: W/o oil filter: 1.9 liters (2.0 US.qts, 1.7 Imp. qts)
With oil filter: 2.6 liters (2.75 US.qts, 2.3 Imp. qts)
Fuel system
Type:Two-barrel, side-draft carburetor with fixed main jets
Fuel pump:Pulse style fuel pump or remote-mounted electric fuel pump (optional)
Fuel filter:In-line
Ignition system
Type:CDI/MDI or Digital Spark Advance Ignition (DSAI) ignition systems
Spark plug:Champion RC12YC
Spark plug gap:0.76 mm (0.030 in)
Ignition coil air gap0.280-0.330 mm (0.011-0.013 in)

References

1. Kohler Command PRO CH940-CH1000 service manual. Kohler Co. 2022.

Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

ATTENTION! Dear visitors, this is an informational database of technical specifications, we are not a parts supplier or a marketplace.

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.

Be the first to comment

Leave a Reply

Your email address will not be published.


*