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Tightening cyJ,inder head bolts may decrease valve clear-
ance. Check and adjust valves if necessary (See Valve Adjust-
ment).
It may be advisable to install new radiator and heater hose,
especially when ethylene glycol or glycerine anti-freezing solu-
tions are used. Ethylene glycol and glycerine have a tendency
to shrink rubber that previously has been swollen by the
absorption of water, and leaks may develop.
The water pump seal must be leak tight, not only to avoid
loss of liquid, but to prevent air from being drawn into the
cooling system. Aeration of the cooling liquid causes foaming
and promotes oxidation which may result in serious corrosion.
After the anti-freezing solution has been installed, the
entire system, including the hose connections, cylinder head
gasket and pump, should be inspected regularly to insure that
no leaks have developed.
The use of additional rust preventives, or inhibitors, is
Fig. 45-An'i-Freeze Tes'er
not recommended with "GM
Anti-Freeze," "GM Ethylene
Glycol," or with other anti-
freeze preparations that have
been chemically treated or
compounded for use in auto-
motive cooling systems.
Testing. Some devices, used
for testing anti-freezing solu-
tions, will indicate the cor-
rect freezing point only when
the test is made at a specific
temperature. Other testers,
provided with thermometers
and tables, indicate the freez-
ing points corresponding to
readings made at various
temperatures (fig. 45). Dis-
regarding the temperature
of the solution, when tested,
may cause an error as large as 30° F.
Some testing devices are made to test only one kind of anti-
freezing solution. Others have several scales and may be used
for the corresponding kinds of anti-freeze .
• 40 •
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