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SERVICE MANUAL
COMMAND CH18-745
HORIZONTAL CRANKSHAFT
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Section 1 Safety and General Information CH18-745 1 Section 1 Safety and General Information Safety Precautions To ensure safe operation please read the following statements and understand their meaning. Also refer to your equipment manufacturer's manual for other important safety information. This manual contains safety precautions which are explained below. Please read carefully. WARNING Warning is used to indicate the presence of a hazard that can cause severe personal injury, death, or subst
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Section 1 Safety and General Information WARNING WARNING WARNING Explosive Gas can cause fires and Explosive Fuel can cause fires and Carbon Monoxide can cause severe acid burns. severe burns. severe nausea, fainting or death. Charge battery only in a well Stop engine before filling fuel tank. Do not operate engine in closed or ventilated area. Keep sources of confined area. ignition away. Lethal Exhaust Gases! Explosive Gas! Explosive Fuel! Engine exhaust gases contain Batteries produce explosi
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Section 1 Safety and General Information Engine Identification Numbers When ordering parts, or in any communication 1 involving an engine, always give the Model, Specification and Serial Numbers, including letter suffixes if there are any. The engine identification numbers appear on a decal, or decals, affixed to the engine shrouding. See Figure 1-1. An explanation of these numbers is shown in Figure 1-2. Identification Decal Figure 1-1. Engine Identification Decal Location. A. Model No. C H 18
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Section 1 Safety and General Information Oil Recommendations Fuel Recommendations Using the proper type and weight of oil in the crankcase is extremely important. So is checking oil daily and WARNING: Explosive Fuel! changing oil regularly. Failure to use the correct oil, or Gasoline is extremely flammable and its vapors can using dirty oil, causes premature engine wear and failure. explode if ignited. Before servicing the fuel system, make sure there are no sparks, open flames or other Oil Type
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Section 1 Safety and General Information Periodic Maintenance Instructions 1 WARNING: Accidental Starts! Disabling engine. Accidental starting can cause severe injury or death. Before working on the engine or equipment, disable the engine as follows: 1) Disconnect the spark plug lead(s). 2) Disconnect negative (-) battery cable from battery. Maintenance Schedule These required maintenance procedures should be performed at the frequency stated in the table. They should also be included as part of
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Section 1 Safety and General Information Dimensions in millimeters. Inch equivalents shown in (). Figure 1-4. Typical Engine Dimensions CH Series with Standard Flat Air Cleaner. 1.6
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Section 1 Safety and General Information Dimensions in millimeters. 1 Inch equivalents shown in (). Figure 1-5. Typical Engine Dimensions CH EFI Series with Heavy-Duty Air Cleaner. 1.7
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Section 1 Safety and General Information General Specifications¹ Power (@ 3600 RPM, corrected to SAE J1995) CH18............................................................................................................................ 13.4 kW (18 HP) CH20............................................................................................................................ 14.9 kW (20 HP) CH22/23 ..............................................................................................
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Section 1 Safety and General Information Camshaft End Play (With Shim) .................................................................................. 0.076/0.127 mm (0.0030/0.0050 in.) 1 Running Clearance ...................................................................................... 0.025/0.063 mm (0.0010/0.0025 in.) Bore I.D. New ....................................................................................................... 20.000/20.025 mm (0.7874/0.7884 in.) Max. Wear Limi
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Section 1 Safety and General Information Closure Plate Closure Plate Fastener Torque .............................................................. 24.4 N·m (216 in. lb.) Crankshaft End Play (Free) .................................................................................... 0.070/0.590 mm (0.0028/0.0230 in.) End Play (With Thrust Bearing Components) ....................................... 0.070/0.270 mm (0.0028/0.0100 in.) Except CH25 Engines Below Serial No. 2403500008 .................
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Section 1 Safety and General Information Cylinder Head Cylinder Head Fastener Torque 1 Hex. Flange Nut - Torque in Two Stages .......................................... initially to 16.9 N·m (150 in. lb.) finally to 33.9 N·m (300 in. lb.) Head Bolt - Torque in Two Stages .................................................. initially to 22.6 N·m (200 in. lb.) finally to 41.8 N·m (370 in. lb.) Max. Out-of-Flatness ............................................................................ 0.076 mm
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Section 1 Safety and General Information Muffler Muffler Retaining Nut Torque .................................................................. 24.4 N·m (216 in. lb.) Oil Filter Oil Filter Torque .................................................................................... 10.4-12.7 N·m (90-110 in. lb.) Oil Cooler Oil Cooler/Adapter Nipple Torque ......................................................... 27 N·m (20 ft. lb.) Piston, Piston Rings, and Piston Pin Piston-to-Piston Pin Running
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Section 1 Safety and General Information Piston, Piston Rings, and Piston Pin cont. Piston Thrust Face-to-Cylinder Bore² Running Clearance 1 New - CH18, CH20, CH22 (624 cc) ............................................... 0.014/0.057 mm (0.0005/0.0022 in.) New - CH22/23 (674 cc) ................................................................. 0.021/0.062 mm (0.0008/0.0024 in.) New - CH25, CH26, CH730-745 .................................................... 0.001/0.045 mm (0.039/0.0018 in.) Speed
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Section 1 Safety and General Information Valves and Valve Lifters cont. Exhaust Valve Guide I.D. New ................................................................................................ 7.038/7.058 mm (0.2771/0.2779 in.) Max. Wear Limit ............................................................................. 7.159 mm (0.2819 in.) Valve Guide Reamer Size Standard......................................................................................... 7.048 mm (0.2775 in.) 0.25 mm
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Section 1 Safety and General Information English Fastener Torque Recommendations for Standard Applications 1 Tightening Torque: N·m (in. lb.) + or - 20% Bolts, Screws, Nuts and Fasteners Grade 2 or 5 Assembled Into Cast Iron or Steel Fasteners Into Aluminum Grade 2 Grade 5 Grade 8 Size 8-32 2.3 (20) 2.8 (25) --------- 2.3 (20) 10-24 3.6 (32) 4.5 (40) --------- 3.6 (32) 10-32 3.6 (32) 4.5 (40) --------- --------- 1/4-20 7.9 (70) 13.0 (115) 18.7 (165) 7.9 (70) 1/4-28 9.6 (85) 15.8 (140) 22.6 (200)
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Section 1 Safety and General Information 1.16
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Section 2 Special T CH18-745 ools Section 2 2 Special Tools Certain quality tools are designed to help you perform specific disassembly, repair, and reassembly procedures. By using tools designed for the job, you can service engines easier, faster, and safer! In addition, you’ll increase your service capabilities and customer satisfaction by decreasing engine downtime. Kohler special tools are handled by SPX Corp., a division of Owatonna Tool Corp. (OTC). The tools are easy to purchase by contac
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Section 2 Special Tools Find a used connecting rod from a 10 HP or larger engine. Remove and discard the rod cap. If it is a Posi- Lock rod, you will also need to remove the studs. If it is a Command rod, you will need to grind off the aligning steps, so the joint surface is flat. Find a 1 in. long capscrew with the correct thread size to match the threads in the connecting rod. Obtain a flat washer with the correct I.D. to slip on the capscrew and an O.D. of approximately 1 in. Kohler Part No.
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Section 2 Special Tools RTV Silicone Sealant RTV silicone sealant is used as a gasket between the crankcase and closure plate. Only oxime-based, oil resistant RTV sealants, such as ® those listed below, are approved for use. Loctite Nos. 2 5900 and 5910 are recommended for best sealing characteristics. ® Loctite Ultra Blue 587 ® Loctite Ultra Copper ® Loctite Ultra Black 598 ® Loctite 5900 (Heavy Body) ® Loctite 5910 Figure 2-6. Camshaft Break-in Lubricant. NOTE: Always use fresh sealant. Using
