Chapter 3—ENGINE MAINTENANCE
Figure 3-8.—Figure Removed.
gears. The valve packing nut should be kept only
finger tight and should be lubricated occasionally
with a drop of oil. Should it become necessary
to renew the packing, you will need to remove the
nut, take out the packing gland, clean the stuff-
ing box, and repack it with asbestos wicking
saturated with oil.
Should the temperature of the freshwater
leaving the engine be too high when the regulator
is set on the lowest adjustment setting you should
do the following:
1. Ensure that the manual pointer is set at the
THERMOSTATIC position.
2. Ensure that the packing gland is not
binding the valve stem and that the valve stem is
not stuck in the COOLER CLOSED (minimum
cooling) position.
3. Check the water lines for other causes of
the difficulty. If this check does not reveal the
cause of the trouble, it is probable that the
temperature control element is inoperative, and
that it should be checked.
If undercooling occurs when the temperature
regulator is set on the highest adjustment setting,
check for a sticking valve in the BY-PASS
CLOSED (maximum cooling) position. Sticking
may be caused by a tight stuffing box or by dirt
under the lower valve seat. If the temperature at
the bulb is lower than the set temperature and the
valve position indicator shows COOLER
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