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| Home / Engines / Kohler Engines / Kohler CH15S |
Kohler Command CH15S Problems
| Engine Model: Kohler Command CH15S |
| Engine Type: 4-cycle 1-cylinder horizontal shaft air-cooled gasoline engine |
| Total Displacement: 26 cu.in (426 cc) |
| Rated Engine Power: 15 Hp (11.5 kW) at 3600 rpm |
| Fuel System: Walbro or Nikki carburetor with adjustable jet or fixed jet |
| Engine difficult to start or will not start |
Gas tank is empty - Fill gasoline up.
Wrong fuel grade - Use quality gasoline.
There is air in the fuel system - Bleed the system.
Defective spark plug wire connection - Inspect the spark plug wire connection, replace or repair.
Spark plug is damaged - Change spark plug as required.
Plugged fuel filter - Change fuel filter.
Faulty safety switch - Change damaged switch.
Carburetor is not adjusted - Check carburetor float adjustment.
Bad compression - Check and change damaged parts.
Damaged or not adjusted choke cable - Adjust correctly or replace the cable.
| Engine runs irregularly |
Cooling fins are plugged - Wash or clean as required.
Ignition system failure - Check ignition system and replace faulty parts.
Throttle cable is stuck or faulty - Service or replace the cable.
Dirty air filter element - Change or clean air filter.
Dirty or damaged fuel pump - Check fuel pump and replace if necessary.
| Engine starts and then shuts off |
Spark plug is damaged - Change spark plug as required.
Carburetor is dirty or defective - Clean or replace carburetor.
Defective ignition coil - Replace ignition coil as necessary.
Worn or loose valve springs - Replace valve springs.
Valves are stuck - Valves must be cleaned.
| Engine is overheated |
Not enough engine oil - Check and refill engine oil.
Engine overload - Reduce load.
Plugged cooling fins - Need to wash or clean.
Carburetor is running lean - Adjust carburetor properly.
Ignition timing is improper - Ignition timing needs to be set properly.
Wrong valve setting - Adjust valves correctly.
| Abnormal engine knocking or noise |
Stale gasoline - Use correct fuel.
Engine overloaded - Reduce engine load.
Low engine oil level - Check and refill engine oil.
Too low idle RPM - Need to adjust idle speed.
Clogged or damaged fuel pump - Inspect fuel pump and change as required.
Crankshaft or main bearings are worn out - Repair or replace defective parts.
Valve clearance is improper - Adjust to proper valve clearance.
Piston rings or cylinder bore are damaged - Replace defective parts.
| Engine loses power |
Improperly or clogged carburetor - Adjust the carburetor correctly or clean it.
Dirty air filter element - Clean or replace air filter.
Fuel pump is faulty or clogged - Clean or install new fuel pump.
Ignition system failure - Check ignition system and replace faulty parts.
Cylinder head gasket is defective - Install new cylinder head gasket.
Valves are burned or stuck - Clean or replace valves.
Push rod is worn or defective - Push rod should be replaced.
Cylinder block parts are worn out - Replace defective components as required.
Oil filter element is clogged (if equipped) - Change or clean oil filter.
| Engine uses too much fuel |
Choke doesn't open well - Adjust or replace choke cable.
Improper adjustment of carburetor main jet - Adjust the carburetor main jet correctly.
Spark plug is faulty or loose - Tighten or change the spark plug.
Stuck, worn, or burned valves - Service or change valves.
Sleeve, rings, or piston are damaged - Change defective parts.
Valve clearance is incorrect - Adjustment procedure required.
| Excessive oil consumption |
Worn seals or gaskets - To repair leaks, replace worn parts.
Valve guides or stems are damaged - Install new valves.
Worn or stuck piston rings - Replace piston rings.
Damaged piston or cylinder liner - Check piston and liner, replace as required.
Plugged breather hose or pipe - Replace or clean.
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