Kohler CH26 EFI Specifications
| Engine Model: Kohler Command Pro CH26 EFI |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 44 cu.in (725 cc) |
| Rated Engine Power: 26 Hp (19.4 kW) at 3600 rpm |
| Fuel System Type: Electronic fuel injection (EFI) |
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Engine Model ..................... Kohler Command PRO CH26 EFI
Engine Type ..................... 4-cycle OHV horizontal shaft V-Twin cylinder air-cooled gasoline
Number of Cylinders ..................... 2
Displacement, cc (cu.in) ..................... 725 (44.0)
Cylinder Bore, mm (in) ..................... 83.0 (3.27)
Piston Stroke, mm (in) ..................... 67.0 (2.64)
Rated Engine Power, hp (kW) ..................... 26.0 (19.4)
Rated Engine Speed, rpm ..................... 3600
Peak Torque, Nm (ft-lbs) ..................... 54.2 (40.1)
Torque Speed, rpm ..................... 2800
Low Idle Speed, rpm ..................... 1500
High Idle Speed, rpm ..................... 4200
Compression Ratio ..................... 9.0:1
Fuel System ..................... Electronic fuel injection (EFI)
Lubrication System ..................... Full pressure
Oil Filter Type ..................... Full-flow
Air Cleaner Type ..................... Replaceable, paper element
Oil Capacity, L (qts) ..................... 1.9 (2.0)
Electrical System Rating, Volts ..................... 12
Starter Type ..................... Electric
Overall Length, mm (in) ..................... 355 (14.1)
Overall Width, mm (in) ..................... 451 (17.7)
Overall Height, mm (in) ..................... 483 (19.0)
Dry Weight, kg (lbs) ..................... 43.0 (94.0)
Cylinder Bore I.D (Standard), mm (in) ..................... 82.988-83.013 (3.2672-3.2682)
Cylinder Bore I.D (Wear Limit), mm (in) ..................... 83.051 (3.2697)
Cylinder Bore (Max Out of Round), mm (in) ..................... 0.12 (0.0047)
Cylinder Bore Max Taper, mm (in) ..................... 0.05 (0.0020)
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)
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)
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)
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 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) ..................... 0.025-0.048 (0.0010-0.0019)
Second Ring Groove Clearance, mm (in) ..................... 0.015-0.037 (0.0006-0.0015)
Oil Ring Groove Clearance, mm (in) ..................... 0.026-0.176 (0.0010-0.0070)
Top Ring End Gap, mm (in) ..................... 0.25-0.56 (0.0100-0.0224)
Second Ring End Gap, mm (in) ..................... 0.25-0.56 (0.0100-0.0224)
Piston O.D (Standard), mm (in) ..................... 82.986 (3.2671)
Piston O.D (Wear Limit), mm (in) ..................... 82.841 (3.2614)
Piston to Cylinder Bore Clearance, mm (in) ..................... 0.001-0.045 (0.039-0.0018)
Spark Plug Type ..................... Champion RC12YC
Spark Plug Gap, mm (in) ..................... 0.76 (0.030)
Module Air Gap, mm (in) ..................... 0.28-0.33 (0.011-0.013)
Speed Sensor Air Gap, mm (in) ..................... 1.50±0.25 (0.059±0.010)
Engine Oil Type (Summer Time) ..................... SAE 10W-30
Engine Oil Type (Winter Time) ..................... SAE 5W-30
Oil Classification (API Service) ..................... SJ or higher
Oil Capacity (w/o Filter), L (qts) ..................... 1.7 (1.8)
Oil Capacity (with Filter), L (qts) ..................... 1.9 (2.0)
Oil Filter Part Number .............. 52 050 02-S or 12 050 01-S
Fuel Filter Part Number .............. 24 050 03-S
Primary Air Filter Part Number .............. 25 083 01-S
Secondary Air Filter Part Number .............. 25 083 04-S
Change Engine Oil ..................... Every 100 hours
Clean Oil Cooler Fins ..................... Every 100 hours
Check Air Filter ..................... Every 150 hours
Change Oil Filter ..................... Every 200 hours
Replace Fuel Filter ..................... Every 200 hours
Replace Spark Plug ..................... Every 200 hours
Replace Prymary Air Filter ..................... Every 300 hours
Replace Secondary Air Filter ..................... Every 600 hours
Cylinder Head Nut ..................... 16.9-33.9 Nm (12.5-25.1 ft-lbs)
Cylinder Head Bolt ..................... 22.6-41.8 Nm (16.7-30.8 ft-lbs)
Rocker Arm Screw ..................... 11.3 Nm (8.3 ft-lbs)
Connecting Rod Cap ..................... 22.6 Nm (16.7 ft-lbs)
Flywheel Retaining Screw ..................... 66.4 Nm (49.1 ft-lbs)
Intake Manifold Mounting ..................... 7.4-9.9 Nm (5.5-7.3 ft-lbs)
Speed Control Bracket ..................... 7.3-10.7 Nm (5.4-7.9 ft-lbs)
Closure Plate ..................... 24.4 Nm (18.1 ft-lbs)
Oil Drain Plug ..................... 13.6 Nm (10.1 ft-lbs)
Governor Lever Nut ..................... 6.8 Nm (5.1 ft-lbs)
Ignition Module ..................... 4.0-6.2 Nm (2.9-4.6 ft-lbs)
Muffler Retaining Nut ..................... 24.4 Nm (18.1 ft-lbs)
Fuel Pump Screw ..................... 2.3 Nm (1.7 ft-lbs)
Spark Plug ..................... 27 Nm (20.1 ft-lbs)
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