Jeep UNIVERSAL CJ-2A - Page 28

'Jeep' UNIVERSAL and 'Jeep' DISPATCHER
D
L4-134 ENGINE
MODELS C J -28, C J -38, D J -38
Contents
SUBJECT PAR.
Assembly, Engine ........................ D-70
Camshaft.... . . . . . . . . . D-25, D-48, D-73
Clutch......... . . . . ....... D-21, D-80
Connecting Rods .............. D-17, D-33, D-87
Crankcase Ventilator Valve. . . ........ D-13
Crankshaft. . . . . . . . . . . . . . . . . D-23, D-35, D-74
Crankshaft End Play . . . . . . . ........... D-7 5
Crankshaft Main Bearings ........... D-41, D-74
Crankshaft Pulley ................... D-11, D-88
Crankshaft Rear Bearing Seal. . . ......... D-60
Cylinder Block. . . . . . . . ........... D-29
Cylinder Bores. . . . . . . .............. D-32
Cylinder Head ................ D-14, D-69, D-90
Diagnosis, Engine . . . . ............. D-1 03
Disassembly, Engine. . . . . ............... D-6
Flywheel. . . . . . . . . . . D-22, D-64, D-79
Ground Strap . . . . . . . ................ D-4
D-1. GENERAL
Engine service and repair is covered in this section
in the following manner:
a. General description of the engine.
b. Removal of the engine from the vehicle.-
c. Complete engine disassembly out of the vehicle.
Special instructions are included with some opera-
tions to cover difference required when disas-
sembly is done with the engine installed.
d. Inspection and repair of engine components
with the parts removed.
e. Engine reassembly with the engine removed
from the vehicle. The final paragraphs cover valve
adjustment, oiling system of the engine, and
crankcase ventilation.
D-2. Description
The Model L4-134 engine is an L-head four-cylinder
engine. The cylinder block and crankcase are cast
integrally. Both intake and exhaust valves are
mounted in the cylinder block with through water
jacketing to provide effective cooling. The valves
are operated by conventional valve tappets.
The engine is equipped with a fully counterbalanced
crankshaft supported by three main bearings. To
better control balance, the counterweights are in-
dependently forged and permanently attached to
the crankshaft with dowels and capscrews that are
tack-welded. Crankshaft end play is adjusted by
shims placed between the crankshaft thrust washer
and the shoulder on the crankshaft.
Aluminum pistons, forged steel connecting rods,
and replaceable main and connecting rod bearings
are used in this engine. The camshaft on current
production engines is gear driven from the crank-
shaft (chain driven on early production engines).
SUBJECT PAR.
Inspection and R.epair. . . D-28
Manifolds.. . . . . . . . . . ... D-8, D-92
Oil Filler Tube. . . . . . . . ........ D-9, D-93
Oil Filter ............................... D-102
Oil
Pan. . . . . . . . . . . . . . . . . . .. D-16, D-63, D-89
Oil Pump.... . . . . . . . . . . . D-12, D-62, D-85
Oiling System. . . . . . . . . . . . D-100
Pistons... . . . . . . . . . . . . . . D-17, D-33, D-87
Removal, Engine . . . . . . . . . . D-5
Specifications. . . . . . . . . . . . . ........... D-104
Tappets and Cover. . . . . . . . . . . D-26, D-59, D-72
Timing Gears and Cover ....... D-18, D-51, D-76,
D-83, D-86
Valve Adjustment. . . . . . . . . ......... D- 17
Valves, Springs, and Guides .... D-24, D-53, D-81
Water Outlet Fitting. . . . . ........ D-10, D-95
Water Pump ........................ D-7, D-94
The water pump is mounted on the front of the
cylinder block, and is belt driven by the crank~
shaft. Circulation of the coolant is controlled by
a thermostat installed in the water outlet which is
mounted on top of the cylinder head.
The engine is pressure lubricated. An oil pump,
gear driven by the camshaft, is mounted externally
on the left side of the crankcase. The pump forces
the lubricant through oil channels and drilled
passages in the crankshaft to efficiently lubricate
the main and connecting rod bearings. Lubricant
is also force fed to the camshaft bearings and timing
gears. Cylinder walls and piston pins are lubricated
from spurt holes in the "follow" side of the con-
necting rods.
The carburetor is mounted on top of the intake
manifold. The intake and exhaust manifolds are
mounted on the left side of the cylinder block. A
thermostatically controlled valve in the exhaust
manifold controls the temperature of fuel-air mix-
ture in the intake manifold.
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 im-
portant to ·check the engine serial number to de-
termine if oversize or undersize parts are required.
Definite identification is given by a letter stamped
after the engine serial number. The letters used
and their meanings are given here:
A- .010" [0,254 mm.] undersize main and
connecting rod bearings.
8-- .010" [0,254 mm.] oversize pistons.
AB - Combination of A and B.
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