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| Home / Engines / Kohler Engines / Kohler M18 |
Kohler Magnum M18 Problems
| Engine Model: Kohler Magnum M18/M18S |
| Engine Type: 4-cycle twin-cylinder horizontal shaft gasoline engine |
| Total Displacement: 42.2 cu.in (691.3 cc) |
| Rated Engine Power: 18 Hp (13.4 kW) at 3600 rpm |
| Fuel System: Kohler or Walbro carburetor with adjustable jet or fixed jet |
| Engine won't start or difficult to start |
Fuel tank is empty - Add gasoline.
Improper fuel grade - Use quality fuel.
Dirt and debris in fuel system - Remove debris and dirt.
Spark plug wire connection are damaged - Check the spark plug wire connection, repair or replace.
Spark plug is defective - Spark plug need to be replaced.
Clogged fuel filter - Replace fuel filter.
Faulty safety switch - Change damaged switch.
Carburetor is not working properly - Inspect and adjust.
Low cylinder compression - Check cylinder block and replace worn parts.
Choke cable is unadjusted or damaged - Change cable or adjust properly.
| Engine runs irregularly |
Plugged cooling fins - Need to clean or wash.
Ignition system is defective - Test ignition and replace failed parts.
Faulty or stuck throttle cable - Change or service the cable.
Air filter element is plugged - Change or clean air filter.
Clogged or damaged fuel pump - Clean or replace fuel pump.
| Engine stalls after starting |
Spark plug is defective - Replace spark plug.
Defective or dirty carburetor - Replace or service carburetor.
Ignition coil is damaged - Change ignition coil as required.
Broken or bad valve springs - Install new valve springs.
Stuck valves - Clean the valves.
| Engine overheated |
Low engine oil level - Need to add engine oil.
Engine is under excessive load - Reduce engine load.
Cooling fins are clogged - Clean and wash as required.
Too lean fuel mixture in carburetor - Adjust carburetor properly.
Ignition timing is improper - Ignition timing needs to be set properly.
Incorrect valve setting - Set the valves correctly.
| Engine knocking sound or abnormal noise |
Stale fuel - Use correct gasoline.
Excessive engine load - Load reducing required.
Not enough engine oil - Check and refill engine oil.
Wrong adjustment of low idle speed - Adjust idle speed.
Clogged or damaged fuel pump - Clean or replace fuel pump.
Crankshaft or main bearings failure - Crankshaft or bearings need to be replaced.
Valve clearance is improper - Adjust to proper valve clearance.
Worn cylinder bore or piston rings - Change faulty components.
| Low engine power |
Improperly or clogged carburetor - Clean or properly adjust carburetor.
Plugged air filter - Change or clean air filter.
Dirty or damaged fuel pump - Test fuel pump and replace if necessary.
Defective ignition system - Inspect ignition system and change faulty parts.
Cylinder head gasket is worn - Replace cylinder head gasket.
Stuck or burned valves - Clean or change valves.
Push rod is damaged or worn - Replace push rod.
Damaged cylinder block components - Replace defective parts as required.
Dirty oil filter element (if equipped) - Service or change oil filter.
| High fuel consumption |
Throttle did not open fully - Replace or adjust throttle cable.
Improper adjustment of carburetor main jet - Adjust main jet as required.
Faulty or loose spark plug - Tighten or replace spark plug.
Valves are stuck, worn, or burned - Replace or clean valves.
Piston, sleeve, or rings are damaged - Change faulty components.
Valve clearance is not correct - Adjustment procedure required.
| High engine oil consumption |
Damaged gaskets or seals - Replace defective parts.
Valve guides or stems are damaged - Install new valves.
Damaged or seized piston rings - Install new piston rings.
Scuffed piston or cylinder liner - Check piston and liner, replace as required.
Plugged breather hose or pipe - Clean or change.
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