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 Corrective Action
Probable Cause
Malfunction
the cylinder head. Free the values
by cleaning the valve stems.
Replace valves if burned (para
d.
Replace (para 3-12).
d. W arped valves.
e.
Remove valve cover, and with
e. Stuck valve.
screwdriver, free the sticking
valve. Valve stem and guide will
have to be cleaned to restore
proper clearance. If condition
continues, valves need regrind-
ing.
a.
Remove cylinder head. Clean out
4. Engine knocks.
carbon (para 3-12).
(pinging knock in cylinder).
b.
Replace bearings (para 3-16).
(Sharp knock, low oil pressure.1
c. Loose m a i n b e a r i n g s . ( H e a v y
knock-low oil pressure.)
d. Loose piston pins. (Sharp double
knock.)
e. Piston and cylinder wear.
pistons. and rings lpara 3-16).
a.
Use
solvent
solution
and
a. Scale in water jacket.
5. Engine overheats.
thoroughly flush the cooling
system.
Caution: Never mix
coolant compounds or
inhibitors with any
cleaning, neutralizing, or
flushing compounds.
b. Remove by thoroughIy flushing
b. Particles of rubber hose or other
out radiator and cooling system.
foreign substances inside the
cooling system.
c. Replace hose.
c. Intake hose at pump collapses.
d. Tighten bolts.
d. Loose timing coupling bolts.
e. Remove by use of air hose or
e. Radiator core clogged.
brush.
f. Leaky radiator.
quick-stop leak solders. because
these tend to clog the circulation.
Lead scolder must be used.
a. Repair leaks by tightening the
a. Low oil pressure. due to external
6. Loss of power.
connection replacing the line.
oil leaks. thin oil, or sticking of oil
Drain and fill with fresh oil.
pressure relief valve.
Remove oil pressure relief valve
and clean. Do not switch spring.
b. Tighten connections.
b.
Air leak at fuel line.
c.
Leaky valves.
d.
W orn piston rings.
e. Replace cylinder head gasket
e.
Blown cylinder head gasket.
f. Clean air cleaner and tubing.
f.
Air cleaner obstructions.
g. Remove obstruction.
g.
obstruction in exhaust line.
h. Adjust.
h.
Choke valve out of adjustment.
a. Check battery. distributor. cables
a.
W eak spark.
7. Explosion in exhaust
ignition coil.
b. Replace weak or broken spring
8.
Engine
runs
irregularly
(sput-
b. Leaky valves.
ters).
c. Tighten capscrews or replace
c. Leaky intake manifold.
gaskets.
2-2
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