Jeep UNIVERSAL CJ-2A - Page 53

IA-134 ENGIN~,
D-100. OILING SYSTEM
The engine· oil pressure system is desi~ned to pro-
vide adequate lubrication to. all working parts of
'the engine. The gear-type oil pump is driven from
the engine camshaft. The pump is provided with a
floating, screened intake that prevents the circula-
tiop of any sediment that might accumulate in the
. oil pan. By means of this pump,. the main bearing
·journals and crankpins are efficiently lubricated
through an oil gallery and passages in the cylinder
block. Oil is forced under pressure to the main
bearings and through the cheeks of the crankshaft
to the connecting rod bearings. Oil is also force-fed
to the camshaft bearings and timing gears. The oil
pressure is controlled
by relief valve located. in the
oil pump. The valve is designed to open when
. excessive pressure develops in the system, relieving
the pressure and returning the excess oil to. the oil
pan. The cylinder walls, piston pins, and tappets
are supplied with oil from spurt holes in the con-
necting rods. A portion of the oil is continually
passed through an oil filter which effectively re-
. moves any foreign matter suspended in the oiL A
flanged section
on the rear of the crankshaft acts
as an oil slinger and, in combination with the rear
main bearing upper and lower oil seal, prevents the
leakage of oil from the rear end of the cylinder
block. Leakage of oil from the front Of the cylinder
block is controlled by the crankshaft oil slinger
and the front oil seal installed in the timing gear
cover. The oil pressure indicator light in the
instrument panel and the oil level gauge ·or dip
stick in the side of the engine provide a means for
checking
the oil pressure and oil level.
D-101. Crankcase Vent.ilation
e Models CJ-2A, CJ-3A and DJ-3A.
The crankcase ventilating system provides thor-
ough, positive ventilation which reduces to a
mimimum the formation of sludge. The crankcase
is ventilated by a· sealed system. The system is
actuated through a valve attached to the intake
manifold which is connected by a tube to the valve
cover. Clean air is drawn into· the oil filler tube
and through a hose from the ai.r cleaner. Any vapors
in the crankcase are carried into the manifold and
burned.
Be sure there are no air leaks at the tube connec-
tions between the air cleaner and the oil filler tube,
and that the oil filler tube cap gasket is in good
condition. Always
keep the cap locked securely in
place. When tuning the engine or grinding valves,
remove
the control valve and cleanit thoroughly.
If the valve is blocked with carbon, the ventilating
52
system will not operate and, . should the valve
fail to seat, it will be impossible to make the engine
idle satisfactorily.
Some Model DJ-3A engines have a trailer-tube
ventilating system. The cone-shaped baffle at-
tached to the inside of the valve cover should be
removed and cleaned periodically.
FIG. 70-CRANKCASE VENTILATING SYSTEM
(MODELS CJ-2A AND CJ -3A)
D-1 02. Oil f"i Iter
1-Valve Open
2-Valve Closed
The engine is equipped with a replaceable element
type oil filter. This oil filter must be serviCed
periodically as outlined in the Lubrication Section.
To replace the filter element remove the cover,
lift
out the old· element, and install a new filter
and gasket. The filter assembly may be replaced
by detaching the oil·lines at the case and removing
the· mounting bracket.