Allis-Chalmers 400 Series - Service Tips

Service Tips
SERVICE TIPS
HARD STARTING OR LOSS OF POWER
a. Faulty ignition.
1. Leads grounded or loose.
2. Spark plug faulty or improperly gapped.
3. Coil, points or condenser defective.
b. Faulty carburetion.
1. Fuel line or filler clogged (dirt-gum).
2. Fuel pump faulty.
3. Carburetor dirty or improperly adjusted.
c. Poor compresion.
1. Head loose or gasket leaking.
2. Valves sticking or leaking.
3. Piston rings worn.
OPERATING ERRATICALLY
a. Clogged fuel line.
b. Water in fuel.
c. Vent in gas cap plugged.
d. Faulty fuel pump.
e. Gasket leaking {carb.-manifold).
f. Governor improperly set.
g. Carburetor improperly adjusted.
KNOCKING
a. Fuel octane too low.
b. Carbon build-up in combustion chamber.
c. Engine overheated.
OCCASIONAL "SKIP" AT HIGH SPEED
a. Spark plug fouled, faulty or gap too wide.
b. Carburetor improperly adjusted.
OVERHEATING
a. Air intake screen or fins clogged.
b. Oil level too high (or low).
c. Fuel mixture too lean.
d. Engine overloaded.
e. Tappet clearance too close.
IDLES POORLY
a. Idle speed too low.
b. Idle Fuel improperly adjusted.
c. Gasket leaking (carburetor to manifold).
d. Spark plug gap too close.
BACKFIRING
a. Carburetor set too lean (Main Fuel).
b. Valve sticking.
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