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TROUBLE SHOOTING
Possible Cause
Possible Remedy
ENGINE OPERATES IRREGULARLY OR KNOCKS
Engine incorrectly timed.
Spark plug dirty; wrong gap or wrong type
Poor or weak spark.
Carburetor setting incorrect.
Poor grade fuel or water in fuel
.
Engine overheating .
Engine valves at fault .
Engine smokes.
Other engine problems.
Clean, reset the gap to .025 inch, or replace.
Check the breaker points and breaker point open¬
ing, spark plug, and wiring.*
Adjust; see "Carburetor" on pages 10 and 11.
Drain and use a good grade of clean fuel.
See "Engine Cooling" See page 21.
•
Adjust the carburetor. Check for worn piston and
rings.*
LACK OF POWER
Air cleaner clogged .
Engine overheated
.
Engine overloaded
.
Poor fuel, too rich, or too lean a mixture..
Fuel tank air vent clogged
.
Air leakage between carburetor and engine
Incorrect timing or faulty ignition .
Clutch slipping (Models 86,108, and 128)
Brake drags.
Clean or replace the air cleaner element. See page
21
.
Reduce the toad.
Run the engine until it warms up before putting it
under load. See "Engine Overheats" below.*
See "Carburetor" on pages 10 and 11.
Open the vent in the cap.
Clean the air cleaner as instructed on page 21.
Tighten the carburetor and manifold mounting
nuts.
See "Spark Plug" on page 22.
Adjust the free travel of the pedal; see page 28.
Adjust the brake; see pages 29 or 30.
ENGINE OVERHEATS
Insufficient cool air, dirty air intake screen,
shroud, or cooling fins .
Keep the air intake area and cooling fins clean; see
"Engine Cooling and Air Cleaner" on page 21.
CREEPING
Speed control out of adjustment (Models
129, 149, and 169)
.
Refer to Service Manual.*
*See your International Harvester dealer.
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