Jeep UNIVERSAL CJ-2A - Page 61

E
F4-134 ENGINE
As is common practice with manufacturers, some
engines are built with oversize cylinder bores or
undersize crankshaft journals. These engines are
considered standard as replacement parts of the
correct sizes are supplied. Before ordering parts or
doing any work with a particular engine, it is .
important to check the engine serial number to
determine if oversize or undersize parts are re-
quired. Definite identification is given by a letter
stamped after the engine serial number. The letters
used and their meanings are given here:
A- .010
11
[0,254 mm.] undersize main and
connecting rod bearings. :
8- .010
11
[0,254 mm.] oversize pistons.
AB- Combination and A and B.
Detailed specifications for the F4-134 engine are
at the end of this section. Torque specifications for
engine service are at the end of this manual in
Section V. When adjustments are necessary, refer'
to these specifications so that factory, clearances
are maintained.
E-3. Engine Mountings
The front of the engine is supported by two rubber
insulator mountings attached to the , frame side
rail
brackets. The rear of the engine-transmission
assembly is supported by a .rubber insulator
mounting under the rear of the transmission on.
the frame center cross member. This cross member
is bolted to the frame side rails so that it can be
dropped when removing the transmission or engine-
transmission assembly. The rubber insulators allow
free side
and vertical oscillation to effectively
neutralize engine vibration at the Source.
The rubber insulator mountings should be inspected
for separation and deterioration by jacking the
power plant away from the frame, near the sup-
ports. Vibration cannot be effectively absorbed by
separated or worn insulators. They should be re-
placed if faulty.
E-4. Engine Ground Strap
To be sure of an effective ground for the electrical
circuits, a
ground strap bridges the right front
engine support to the chassis. The cortnections of
this strap must be kept clean and tight for proper
operation of lights, generator, regulator, etc.
E-5. ENGINE REMOVAL
Should the engine require overhauling, it is neces-
sary to remove it from the vehicle .. The following
procedure covers
removal of the engine only. On
Models CJ-5 and CJ-6, the engine, transmission
and transfer case may be removed as a unit by
removing (in addition to the following procedure)
the radiator guard and the access plates in the floor
pan.
a. Drain the cooling system by opening the drain
cocks at the bottom of the radiator and lower right
side of the cylinder block.
b. Disconnect the battery at the positive terminal
to avoid the possibility of short circuit.
60
c. Remove the air cleaner horn from the carburetor
and disconnect the breather hose at the oil filler
pipe.
d. Disconnect the carburetor choke and throttle
controis by loosening the clamp bolts and set
screws.
e. Disconnect the fuel-tank-to-fuel-pump line at
the fuel pump by unscrewing· the connecting nut.
f. Plug the fuel line to prevent fuel leakage. Dis-
connect the windshield wiper hose at the fuel pump.
g. Remove the radiator stay bar on Model CJ-3B.
h. Remove the upper and lower radiator hoses by
loosening the hose clamps and slipping the clamps
back on the hose. If so ,equipped; remove the heater
hoses (one to the water pump, one to the rear of
the cylinder head) in the same manner.
i. Remove the four bolts from the fan hub andre-
move the fan hub and fan blades.
J. Reinove the four radiator attaching screws. Re-
move the radiator and shroud as one unit.
k. Remove the starting motor cables. Remove the
starting motor.
I. Disconnect the wires from the generator. Dis-
connect the ignition primary wire at the ignition
coil.
m. Disconnect the oil pressure and temperature
sending unit wires at the units.
n. Disconnect the exhaust pipe at the exhaust
manifold by removing the stud nuts.
o. Disconnect the spark plug cables at the plugs
and remove the- cable bracket from the rocker arm
cover stud.
p. Remove the rocker arm cover by removing the
attaching stud nuts.
q. Attach a lifting bracket to the engine using
·existing head bolt locations. Be sure the bolts
selected will hold the engine with the weight
balanced. Attach lifting bracket to a boom hoist,
or other lifting device, and take up ail slack.
r. Remove the two nuts and bolts from each front
engine support. Disconnect the engine ground strap.
Remove the engine supports. Lower the engine
slightly to permit access to the two top bolts on
the flywheel housing.
s. Remove the bolts which attach the flywheel
housing to the engine.
t. Pull the .engine forw_ard, or roll the vehicle back-
wards, until the clutch clears the. flywheel housing.
Lift the engine from the vehicle.
E-6.
ENGINE DISASSEMBLY
Engine disassembly is presented in the sequence
to be followed when the engine is to be completely
overhauled after removal from the vehicle. Some
of the operations of the procedure are also ap-
plicable separately with the engine in the vehicle,
provided that wherever necessary the part of the
engine to be worked on is first made accessible by
removal of engine accessories or other parts.
When the disassembly operations are performed
with the engine out of the vehicle, it is assumed,
in this procedure, that all of the accessories have