B
FAULT TESTING
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
157
Repair and Service Manual
668061
POOR MIDRANGE OR
HIGH SPEED PERFOR-
MANCE
Spark plug fouled Clean or replace
Dirty air filter Clean or replace
Brake(s) dragging Perform brake maintenance
Faulty thermostat Replace
ENGINE OVERHEATING Coolant hose leak Tighten hoses connections. Replace hoses
Damaged Radiator Repair or replace
Faulty water pump Repair or replace
Low coolant level Add coolant. See GENERAL SPPECIFICATIONS.
Faulty radiator fan Repair or replace
Damaged or plugged muffler Clean, repair or replace
Inadequate oil supply Check oil system, inspect oil pump, change oil, fill to correct
level
REPEATED SPARK PLUG
FOULING
Wrong spark plug type Replace with correct spark plug. See GENERAL SPPECIFI-
CATIONS.
Wrong spark plug gap Replace with correct spark plug. See GENERAL SPPECIFI-
CATIONS.
Faulty ignition system Check and repair if required
Poor quality gasoline Use correct fuel, check bulk storage tank for proper storage
and handling. See GENERAL SPPECIFICATIONS.
Air leak allowing dirt to enter system Repair or replace air intake hose
THROTTLE BODY
FLOODS ENGINE
Fuel contamination Clean fuel system/throttle body
Clogged air filter element Clean or replace
EXCESSIVE EXHAUST
SMOKE
Wrong oil weight Replace with recommended oil. See GENERAL SPPECIFICA-
TIONS.
Dirty oil Replace. See GENERAL SPPECIFICATIONS.
Crankcase overfilled with oil Drain and fill to recommended level. See GENERAL SPPECI-
FICATIONS.
Piston rings worn or broken Replace
Valves worn Replace
Valve seals or valve guides worn Replace
BACKFIRING
Faulty plug wires Replace
Faulty ignition system Check and repair if required
ERRATIC, SURGING,
OR SUDDEN CHANGE
IN GOVERNED SPEED
Governor bracket spring dragging Clean and/or oil
Problem with adjustment of accelera-
tor, governor and throttle body link-
age
Adjust
Bent governor arm Repair or replace
Bent governor shaft Replace
Governor failure within the rear axle Repair
CONDITION POSSIBLE CAUSE CORRECTION
Fig. 2 Powertrain Performance Troubleshooting (Continued)
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