Service Manual

TROUBLESHOOTING (cont’d)
Engine runs but knocks or misses.
Possible Cause Corrective Action
Dirt, water, or stale fuel is in the fuel system Drain and flush the fuel system; add fresh fuel
A spark plug lead is loose Reconnect the spark plug lead
A spark plug is faulty Replace the spark plug
Loose wires or poor connections Check and tighten wire connections
Engine overheating See ENGINE OVERHEATS
Engine will not idle.
Possible Cause Corrective Action
The fuel tank is restricted Check hoses, clean or replace
Dirt or water is in the fuel system Drain and flush fuel system; add fresh fuel
A spark plug is faulty Replace the spark plug
Carburetor idle passages are plugged Clean or replace carburetor
The Idle speed adjusting screw is incorrectly set Reset to factory specifications
The fuel pump is faulty Repair or replace
Low compression Test compression, correct as needed
Engine overheats.
Possible Cause Corrective Action
(3) air intake screens are dirty Clean with every use
Restricted air flow into the engine or radiator
Inspect & clean the (3) air intake screens & radiator screen
The crankcase oil level is incorrect Fill or drain to the full mark
The fuel mixture is lean Clean carburetor, check float level, and inspect main jet
Excessive loading Reduce load; use lower ground speed
Defective thermostat Replace the thermostat
More coolant is needed Check and add coolant
Engine loses power.
Possible Cause Corrective Action
The crankcase oil level is incorrect Fill or drain to the full mark
The air cleaner element is dirty Clean or replace
Dirt, water, or stale fuel is in the fuel system Drain and flush fuel system; add fresh fuel
The engine is overheated See ENGINE OVERHEATS
A spark plug is faulty Replace the spark plug
Low compression Test compression, correct as needed
Engine knocks.
Possible Cause Corrective Action
Old or improper fuel Drain system and add fresh fuel
Internal wear or damage Inspection required
4
GASOLINE ENGINE
4-4 5xi Series Tractor Service Manual