Kohler CV491S Troubleshooting
| Engine Model: Kohler Command CV491S |
| Engine Type: 4-cycle single-cylinder vertical shaft air-cooled gasoline |
| Total Displacement: 29.9 cu.in (490 cc) |
| Rated Engine Power: 17.2 Hp (12.8 kW) at 3600 rpm |
| Carburetor Type: Float with fixed main jet |
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| Engine starts hard or will not start |
No fuel in fuel tank - Add gasoline.
Incorrect fuel grade - Use correct fuel grade.
Air trapped in fuel system - Bleed air.
Spark plug wire is disconnected or loose - Check the spark plug wire connection, repair or replace.
Spark plug is faulty - Replace spark plug.
Fuel filter is dirty - Change fuel filter.
Defective safety switch - Replace if required.
Carburetor is dirty - Wash, clean and adjust.
Low engine compression - Inspect cylinder block and change defective components.
Choke cable is not adjusted properly or worn - Replace cable or adjust properly.
Clogged cooling fins - Clean and wash as required.
Ignition system problems - Inspect ignition system and change failed components.
Faulty or stuck throttle cable - Change or clean the cable.
Dirty air filter element - Replace or clean air filter.
Clogged or defective fuel pump - Clean or replace fuel pump.
| Engine starts but then shuts off |
Spark plug is defective - Spark plug need to be replaced.
Carburetor is dirty or defective - Carburetor needs to be replaced or cleaned.
Faulty ignition coil - Ignition coil should be replaced.
Bad or broken valve springs - Valve springs need to be changed.
Valves are stuck - Valves need to be cleaned.
Engine oil level is insufficient - Check oil level and add oil as required.
Engine is overloaded - Load reducing is recommended.
Cooling fins are clogged - Wash or clean as required.
Too lean fuel mixture in carburetor - Use proper settings.
Improper ignition timing - Set the ignition timing properly.
Valve setting is improper - Set the valves correctly.
| Engine knocking sound or abnormal noise |
Stale fuel - Use proper gasoline.
Engine is running overloaded - Reduce engine load.
Engine oil level is insufficient - Check oil level and add oil as required.
Incorrectly set low idle speed - Adjustment required.
Fuel pump is damaged or dirty - Check fuel pump and change if required.
Worn main bearings or crankshaft - Repair or replace defective parts.
Incorrect valve clearance - Adjust valve clearance.
Damaged cylinder bore or piston rings - Replace faulty components.
| Engine power is insufficient |
Dirty or incorrectly adjusted carburetor - Carburetor needs to be adjusted correctly or cleaned.
Clogged air filter - Clean or change air filter.
Fuel pump is damaged or dirty - Inspect fuel pump and change as required.
Defective ignition - Check ignition system and replace faulty parts.
Cylinder head gasket is damaged - Replace cylinder head gasket.
Burned or stuck valves - Service or replace valves.
Push rod is bent or worn - Push rod should be replaced.
Damaged cylinder block components - Replace defective components.
Oil filter is blocked (if equipped) - Change or clean oil filter.
| Excessive fuel consumption |
Choke didn't open fully - Adjust or change choke cable.
Carburetor main jet is improperly adjusted - Adjust it properly.
Spark plug is loose or defective - Tighten or replace spark plug.
Stuck, burned, or worn valves - Clean or replace valves.
Sleeve, rings, or piston are damaged - Change defective components.
Excessive valve clearance - Adjust valve clearance.
| Engine oil consumption is too high |
Defective seals or gaskets - To repair leaks, replace worn parts.
Valve guides or stems are damaged - Replace the valves.
Worn or broken piston rings - Piston rings replacement required.
Damaged cylinder liner or piston - Check liner and piston, replace as required.
Breather hose or pipe is plugged - Clean or replace.
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