Allis-Chalmers Model G - Engine Oiling System; Oil Flow and Lubrication Specifications

ENGINE-OILING SYSTEM ,l'
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The Model lti" engine use. regular srade
lubricating oil of the followinSspecifications:
For heavyduty servic~ above 3~F use SAE 30-
For normal duty operation above 3ZoF use
SAE ZOo
For tempe ratures between OOFand 3ZoF
use SAE
ZOo
Below OOFuse SAE lOW.
Heavy duty operation is any operation in
whicn the engin.e is called upon to produce
half or more of its rated horsepower. Nonna!
duty operation is interpreted as an operation
in which the ensine is called upon to produce
an average of less than half of its rated
horsepower.
New or reconditioned engines should use
SAE ZOoil for the first fifty hours of tJpera-
tion and shouldbe operated on light te: :lIediwn
loads if possible.
The oil sump capacity is 3-I/Z quarv!Jwith
oil filter. For oil changes when the filter
is not changed, 3 quart. will fill the sump
to the required level. The oil filter should
be replaced at least each ZOOhours of opera-
tion.
The oil is drawn from the oil sump through
the intake screen and pipe to the oil pump
which is mounted at the rear of the camshaft
and is driven at camshaft speed. The oil
from the pump is forced under pressure into
the oil gallery which is located in the cylin-
der block between the camshaft and the
crankshaft. The oil pressure relief valve
. is located at the rear end of this gallery.
The oil pressure relief valve prevents ex-
cessive pressure from beins developed in
the o"Uing system. Drilled passages are
provided to lead the oil from the oil gallery
to the front main bearing and the rear main
bearins, and the front camshaft bearing. The
drilled passage to the front camshaft is
smaller than those to the crankshaft. The
rear camshaft bearing receives its oil from
seepage from oil pump. The differences in
sizes of the drilled passages assures an
adequate supply of oil to the main bearings.
The center camshaft bearins, cam followers
. or tappets are lubricated from spray. Two
port holes are provided into the valve cham-
ber and the valve springs llnd sterns are lu-
bricated from spray entering this compart-
ment through these two port holes. The front
cam journal has a sroove cut around it s
outside circumference and a hole drilled
from this groove to the front s ide of the
G-Z4
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