Gravely CONVERTIBLE 7.6 - Engine Troubleshooting Guide; Engine Starting and Power Issues; Engine Overheating Causes; Engine Backfiring Diagnosis

4
TROUBLE SHOOTING
CONDITION POSSIBLE CAUSE
A. Hard Starting or Loss of Power
1.
Faulty Ignition.
Check for dirty air cleaner first. a. Loose or grounded high tension or breaker point
leads.
b. Improper breaker point gap and timing.
c. Defective breaker points.
d. Faulty spark plug or improper gap.
e. Faulty condenser or coil.
2. Faulty Fuel System.
a. Gasoline not getting to carburetor.
Dirt or gum in fuel line.
b. Dirt in carburetor.
c. Carburetor improperly adjusted.
B. Overheating
1.
Insufficient available cool air.
2. Dirty air intake screen, shroud or cooling fins.
3. Improper fuel.
4. Fuel mixture too lean.
5. Improper ignition timing.
6. Engine overloaded.
7. Tight tappet clearance.
C. Backfiring
1.
Fuel mixture too lean.
2. Improper timing.
3. Valve "sticking".
D. Occasional "Skip" at High Speed
1.
Spark plug gap too wide.
2. Improper carburetor setting or lack of fuel.
3. Wrong type spark plug. Use recommended spark
plug.
4. Improper timing.
E. Operating Erratically
1.
Clogged fuel line.
2. Water in fuel.
3. Faulty choke control.
4. Improper fuel mixture.
5. Loose ignition connections.
6. Air leaks in manifold or carburetor connections.
7. Vent in gas cap plugged.
F. Engine Will Not Idle
1.
Improper carburetor idling adjustment.
2. Carburetor clogged.
3. Spark plug gap set too close.
4. Leaking carburetor or manifold gaskets.