Kohler CH18S Troubleshooting
| Engine Model: Kohler Command CH18S |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 38 cu.in (624 cc) |
| Rated Engine Power: 18 Hp (13.4 kW) at 3600 rpm |
| Carburetor Type: One-barrel with fixed main jet |
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| Engine hard starting or not starting |
Gas tank is empty - Fill gasoline up.
Incorrect fuel grade - Change fuel.
Air in fuel system - Bleed fuel system.
Disconnected or loose spark plug wire - Inspect the spark plug wire connection, replace or repair.
Defective spark plug - Spark plug need to be replaced.
Fuel filter is clogged - Change fuel filter.
Safety contact for brake pedal defective - Install new part.
Carburetor settings incorrect - Adjusting as required.
Poor compression - Inspect and replace wear parts.
Choke cable is worn or not adjusted properly - Change cable or adjust correctly.
Cooling fins are plugged - Need to clean or wash.
Ignition system malfunction - Inspect ignition system and change faulty parts.
Stuck or defective choke cable - Replace or service the cable.
Air filter element is plugged - Service or replace air filter.
Fuel pump is faulty or clogged - Clean or install new fuel pump.
Damaged spark plug - Spark plug need to be replaced.
Carburetor is clogged or defective - Service or replace carburetor.
Defective ignition coil - Replace ignition coil as necessary.
Weak or damaged valve springs - New valve springs need to be installed.
Valves sticking - Service the valves.
Lack of engine oil - Check and refill engine oil.
Engine is under excessive load - Reduce load.
Cooling fins are clogged - Clean and wash as required.
Too lean fuel mixture in carburetor - Make the correct settings.
Wrong ignition timing - Adjust ignition timing correctly.
Valve setting is improper - Valves needs to be set correctly.
| Engine knocking sound or abnormal noise |
Low octane fuel - Use proper fuel.
Engine is running overloaded - Reduce the load.
Engine oil level is insufficient - Fill up the engine oil.
Incorrectly adjusted low idle speed - Correct the settings.
Dirty or defective fuel pump - Inspect fuel pump and change as required.
Main bearings or crankshaft are worn out - Replace crankshaft or bearings.
Valve clearance is wrong - Adjust valve clearance.
Piston rings or cylinder bore are worn - Replace defective parts.
Carburetor is dirty or improperly adjusted - Carburetor needs to be adjusted correctly or cleaned.
Clogged air filter - Change or service air filter.
Fuel pump is damaged or dirty - Clean or install new fuel pump.
Ignition failure - Inspect ignition system and change faulty parts.
Cylinder head gasket is blown - Install new head gasket.
Stuck or burned valves - Change or service valves.
Bent or worn push rod - Replace push rod.
Worn cylinder block components - Defective components need to be replaced.
Oil filter element is plugged (if equipped) - Replace or clean oil filter.
Throttle did not open fully - Replace or adjust throttle cable.
Carburetor main jet is improperly adjusted - Adjust it properly.
Spark plug is loose or defective - Change or re-tighten spark plug.
Burned, worn, or stuck valves - Replace or service valves.
Piston, sleeve, or rings are damaged - Change faulty parts.
Incorrect valve clearance - Need to adjust valve clearance.
| High engine oil consumption |
Worn gaskets or seals - Replace to repair leaks.
Damaged valve stems or valve guides - Need to replace the valves.
Stuck or worn piston rings - Change the piston rings as required.
Scored cylinder liner or piston - Check liner and piston, change as required.
Breather hose or pipe is blocked - Clean or change.
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