The news scimitar. (Memphis, Tenn.) 1907-1926, 1919-08-30
HERE ARE A FEW
HELPFUL HINTS IN
TRUCK OPERATION
(By Alfred r. Masury, chief engineer,
2 international Motor company, man
ufacturers Of Mack trucks.

ley Alfred II. Magury, chtNI engineer.
international Motor conspany, man
ufacturers OF Mack tEucksl
First OF all, ii is necessary to under
stand the cooling system. Do not ext
poet the truck to labor In low gear
up long grades or through deep sand.
perhaps with a trailer, and still keep
cool II carbon deposit is permitted to
accumulate in the cylinders, If Insult
ficient water Is put in the radiator, II
the oil level is low or the oil is OF the
wrong kind.
At the beginning Of the session 1t is
ordinarily necessary to change the car.
buretor adjustment, that in ummer be
ing a trifle leaner than that for win.
ter. Overheating 10 sure TO result II
the ~carburetor Is Improperly adjusted.
Timing has an important bearing on
cooling. In hot climates where tenn.
peratures are excessive for a considy
cradle part Of the year, the engine may
be made to run cooler, but at a slight
sacrifice Of power, by. setting the cam
shaft one tooth ahead (earlier) on the
timing gears, so that the exhaust valves
open earlier. "A weak spark has the
Same effect as late spark timing, and
overhAAting will result.
Difficult grades can Pc made WITT
greater speed and less fuel in inter-
mediate than IL the engine is permitted
to labor In high to the point OF stalling,
Contrary to- popular supr0sition the en-
CINE will cool better II It ID not obliged
TO labor excessively.
Keep the exhaust clear Of obstruc-
tions and do not allow mud TO cake
on the outside Of the murtlsr or to clog
the outlet, Gt
The radiator must be flled as full a;
possible no not allow the overflow
pipe to become clogged, or flattened BY
q blow or kink or slip down In the ra.
diator.
Use only the best quality Of rubber
hose for water connections, The in
side OF cheap tubing Is apt TO dissolv,
ard the rubber particles clog up tn
system, Go over hose connections II
the spring because some anti.ffaese 80
buttons have a deleterious effect upoi
inside the radiator which will not dis
sipate the heat, 1t must BE- clsanet
out
In filling the radiator only clsar wa
ter should be used, Strain the waite
through a cloth where mona but dirt
use buckets in which, oil has been kept
Keep the fan clean ana well creased
SO that It will turn freely
Not all OF the cooling Of the enSin
Is effected by water but i~uhricatinl
oil plays an important part as IT cool
the bearings, Keep the cranckcas
clean, 1t oools the oil, It has bee
found that gasoline washes the luhri
cant from the cylinder walls and a mis-
ture Of gasoline and oil runs into tn
cranEcAse where In time u destroy
the lubrieating qualities OF the oil. *
this reason the OIL in the crankcas
should be drained ard replaced wit
new oil every 1890 miles IL this !
not done the oil viii be unahle 70 proI
erly Intricate the rubbing surfaces an
heating will result,
The average working temperature (
oil in summer is higher than in winte
and so oil OF the same body will !
thinner. Sometimes it is advisable
use a grade heavier oil in summer
excessively hot spells an especial
heavy grade OF oil ma be required
maintain the oil at the proper consss
ancy in operation, Wseh a heavier {
is used care should be taken not
work the engine TOO hard before it.
warmed up Buy oil only from reliab
refiners.