(4)Use screwdriver and adjust exhaust valve until a
(7)Repeat steps (3) through (6) above for remaining
clearance of 0.025 inch (hot) 0.028 inch (cold) is
cylinders. Cylinders fire in 1-6-2-4-3-5 order.
obtained with thickness gage (fig. 3-42).
(8)Install valve cover (para 3-59).
c. Model D333TA Engine Valve Adjustment.
Note. When engine temperature is at 130' F, or below, it is considered to
be a cold engine.
(1)Remove valve cover (para 3-59).
(5)When clearance is correct, hold adjusting screw
(2)Start engine (para 2-10) and run until operating
with screwdriver and tighten the locknut.
temperature is reached (between 160 and 180F).
(6)Recheck clearance. Readjust if necessary.
(3)When engine is at operating temperature, stop
(7)Repeat steps (3) through (6) for intake valves,
engine (para 2-11) with cylinder No. 1 at top dead center
except use 0.015 inch (hot) 0.017 inch (cold).
on compression stroke (both valves seated closed).
(8)Repeat above procedures for remaining
Refer to figure 3-43, and use a wrench to loosen
cylinders. Cylinders fire in 1-5-3-6-2-4 order.
locknuts holding valve adjusting screws.
(9)Install valve cover (para 3-59).
Section X. ENGINE LUBRICATION SYSTEM
the turbocharger lubrication valve closes off flow of
3-61. General
unfiltered oil and provides filtered oil to turbocharger
a. Description. A pressurized lubricating system,
components. The oil filter bypass valve opens when
filtered and strained, with full flow by-pass features is
filters become restricted and allows oil to bypass filters
pumped from crankcase oil pan through strainer and
and flow directly to outlet passage. Unless filters
filter to passages designed to distribute oil where it is
become restricted or oil viscosity is extremely high, only
most required.
Differences are described under
filtered oil is furnished to the engine bearings. The by-
paragraph devoted to each engine.
pass valves assures supply of lubricating oil any time
b. Engine Model 687C-18-ES. A gear type oil pump
filter, cooler, or both may become clogged.
is mounted in bottom of oil pan at rear of engine. This
pump forces oil to front of engine through a supply line
3-62. Engine Oil Filters
and cored passage to oil strainer; through strainer to
a. For Engine Model 687C-18-ES.
manifolds on each side of engine, where it is distributed
(1)Removal and installation.
to all moving parts by means of holes drilled at strategic
(a)Refer to figure 3-44, disconnect oil line from
points.
Exhaust valve rocker arms are lubricated
elbow at strainer, then remove oil line from filter.
through an external line which supplies oil to end rocker
(b)Remove drain plug, drain filter, then remove
arm shaft. The remaining rocker arms are lubricated by
remaining oil lines and fittings. Plug line ends or ports
means of short jumper connections. The blower is also
to prevent contamination of oil supply.
lubricated through an external line. Drain plugs for
(c)Remove items 1 through 7, figure 3-45, then
draining system are located on bottom of oil pan, and
remove filter and mounting bracket from engine as an
side of oil strainer housing.
assembly.
c. Engine Model D333TA. A two section oil pump
(d)Remove remaining filter in a similar manner.
contains a scavenge pump and a pressure pump. Oil
(2)Disassembly and reassembly. Refer to figure
that does not return to pan is collected by a scavenge
tube and then returned to oil pan. Oil is pumped from
27) order. Reassemble in reverse order.
oil pan to oil cooler, then to oil filters, except on starting,
(3)Cleaning, inspection, and repair.
when it is by-passed through an external line to the
(a)Clean all parts in an approved cleaning solvent,
filters, cutting out the cooler for cold oil. When engine is
except filter element and gaskets which are discarded,
first started, unfiltered oil is passed by the turbocharger
then dry thoroughly.
lubrication valve to turbocharger components by an
(b)Visibly inspect all parts for signs of damage or
external line. As the oil temperature increases, the oil
defect.
cooler by-pass valve closes, forcing oil through cooler to
filter bases. As oil pressure is built up through filters,
3-54
