COOLING
SYSTEM
SERVICE
DIAGNOSIS.
OVERHEATING.
This difficulty may arise owing to one or more of the causes listed below
:-
CAUSE
Ignition timing too late or auto advance and
retard mechanism or suction not operating
correctly.
Fan belt slipping.
Insufficient water in cooling system.
Radiator and/or cylinder block restricted by
the accumulation of sludge,
dirt
or other solid
matter.
I
Thermostat not operating correctly.
Weak mixture caused by incorrect carburettor
setting or air leaks in induction manifold.
Initial tighmess after an engine overhaul or
insufficient clearance of replacement parts
during an overhaul.
Overheating from
bad
lubrication, incorrect
oil level or incorrect grade of oil. The use of
certain
brands of anti-freeze compound
which
have a lowering
effect
on the
boiling
point
during
warm
weather.
REMEDY
Check ignition timing, automatic advance
and retard mechanism and the suction pipe
for the carburettor.
Adjust to give belt
9"
play by moving
dynamo outwards along adjusting
link.
Check
all
joints for leaks including combus-
tion head gasket
Flush out system
with
a detergent and refill,
using clean, softened or soft water.
Remove and test as described on page
4.
Check
carburettor manifold and carburettor
joints, ensure tighmess of manifold.
If due to the former, run-in engine most
carefully and overheating should disappear.
If overheating is caused by the latter
~t
will
not disappear, it
can
even get worse. The
engine should
be
examined for badly fitting
P-.
Check
oil level, grade and circulation, flush-
ing system and refilling
if
necessary. Smiths
"
Bluecol
"
has a tendency to raise the boil-
ing point.
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