Toyota 5R 1969 Repair Manual page 30

b. Points incorrectly adjusted
c. S park plugs gap incorrectly
adjusted
d. L o o s e or defective spark
plug w ire s
e . Defective ignition coil
f. L o o s e primary circuit
connections
g . Defective condenser
3. Engine condition
a. Burnt valves
b . L e a k y manifold gasket
c . P iston s, piston rin gs, and
cylinders w orn
d. Defective cylinder head gasket
e . L o o s e carburetor mounting
bolts
4. Carburetion
a. Choke operating improperly
b. Incorrect engine idling
c. Carburetor dirty and passages
restricted
d . L o o s e carburetor attaching
bolts
e . Carburetor o verflow s
Popping, Spitting and Detonation
1. Ignition system
a. L o o s e connections in ignition
system
b . Defective spark plugs
c. Incorrect ignition timing
d . Incorrect heat range plugs
2. A ir -fu e l mixture
a. Lean combustion mixture
b. Fuel pipe dirty o r restricted
c. A i r leak at carburetor or
intake manifold
3. V a lves
a. Incorrect valve clearance
b. V a lv e s sticky
E N G I N E - Trouble Shooting
Adjust points
Adjust spark plug gap
Tighten o r replace spark plug w ir e s
Replace ignition coil
Tighten connections
Replace condenser
Rep air o r replace valves
Tighten manifold bolts o r replace
gasket
Overhaul engine
Replace gasket
Tighten bolts
Adjust o r repair choke mechanism
Adjust engine idling
Overhaul and clean carburetor
Tighten attaching bolts
R ep a ir carburetor
Inspect and tighten connections
Clean and adjust o r replace spark
plugs
Adjust ignition timing
Replace with c o rr e c t heat range
plugs
Clean and adjust carburetor
Clean o r replace fuel pipe
Tighten carburetor attaching bolts
o r manifold attaching bolts o r rep la ce
gasket
Adjust valve clearan ce
R ep a ir o r rep la ce va lves
3-3