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1 4 0 ENGINE
6A1-3
WPICAL CAM
BEARING OIL
FEED-5
PLACES
MAlN HEAD OIL GALLERY
OIL COOLER BY-PASS VALVE
UNSEATS WHEN 9 TO 1 1 P.S.I.
CONTACTS OPERATE
AT 2 TO 6 P.S.I.
SECTION A-A
4486
FIG. 6A1-3 MAIN OIL CIRCUIT
reason, do not use a jack under the oil pan or crankshaft
pulley. Due to the small clearance between the oil pan and
oil pump screen, jacking against the oil pan may cause it to
be bent against the pump screen, resulting in a damaged oil
pick-up unit. It should be kept in mind, while working on the
engine, that the 12-volt electrical system is capable of violent
and damaging short circuits. When performing any work
where electrical terminals could possibly be grounded, the
ground cable of the battery should be disconnected at the
battery. Any time the carburetor or air cleaner is removed,
the intake opening should be covered. This will protect
against accidental entrance of foreign material which could
follow the intake passage into the cylinder and cause
extensive damage when the engine is started.
ENGINE LUBRICATION
(Fig. 6A1-2, 6A1-3
and 6 A 1 4 )
A crankshaft-driven, externally mounted, eccentric gear
oil pump supplies the engine with controlled full pressure oil
at
40-45
psi. Oil is taken from the top of the gear set through
the high pressure side of the regulator valve and into the
full-flow oil filter. Main and connecting rod bearings are oiled
from the main gallery located along the left side of the block.
Overhead oiling for camshaft and valve train is from the front
main bearing, which acts as a metering device, through
vertical passages in the block and head to the camshaft
bearing gallery. Oil from the cam bearings lubricates the
tappets and valve train. Four oil drain back passages are
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