99
(2). Whistle noise:
Cause
Correction
a.
Intake manifold sealing gasket leaks
Replace sealing gasket or tighten bolts
b.
Exhaust manifold sealing gasket leaks or
Replace sealing gasket or tighten bolts exhaust pipe
sealing gasket leaks
c.
Vacuum hose leaks
Replace
d.
Cylinder head gasket burned badly
Check and replace
(3). Knocking or spanking noise
Cause
Correction
a.
Hydraulic valve lifter works abnormally
Check and replace
b.
Valve mechanism or camshaft worn out
Check and service
c.
Timing belt or tension pulley worn out
Replace
d.
Abnormal accessories ie. alternator or water pump
Check, service and replace
(4). Knocking or hammering noise.
Cause
Correction
a.
Connecting rod bushing worn out (generally severe Check and service knocking, may be relieved
under load.)
b.
Main bearing half shell worn out (booming or Check and service knocking noise, may be relieved
under load)
c.
Piston knocking (apparent with engine cold)
Check and service
d.
Alternator or water pump accessories damaged
Check and service
17.
Engine is overheated.
Cause
Correction
(1). No sufficient coolant in the cooling system
Add coolant
(2). Thermostat damaged
Replace
(3). Radiator core blocked or air inlet cogged
Clean or replace radiator
(4). Radiator electrical fan or coolant temperature
Check, service and replace sensor abnormal
(5). Expansion tank pressure cap damaged
Replace
(6). Water pump leaks or damaged
Service or replace
(7). Ignition timing too late
Adjust ignition tim
ing
(8). Air exists in cooling system
Bleeding the air
(9). Too lean mixture
Adjust carburetor
