(2) Start engine (para 2-10) and run until
F, or below, it is considered to be a
operating temperature is reached (between 160 and
cold engine.
180F).
(5) When clearance is correct, hold
(3) When
engine
is
at
operating
adjusting screw with screwdriver and tighten the locknut.
temperature, stop engine (para 2-11) with cylinder No. 1
at top dead center on compression stroke (both valves
(6) Recheck clearance.
Readjust if
seated closed). Refer to figure 335, and use a wrench
necessary.
to loosen locknuts holding valve adjusting screws.
(7) Repeat steps (3) through (6) for intake
(4) Use screwdriver and adjust exhaust
valves, except use 0.015 inch (hot) 0.017 inch (cold).
valve with a clearance of 0.025 inch (hot) 0.028 inch
(8) Repeat above procedure for remaining
(cold) is obtained with thickness gauge (fig. 3-34).
cylinders. Cylinders fire in 1-5-3-6-2-4 order.
NOTE
(9) Install valve cover (para 3-55).
When engine temperature is at 130
Section X. ENGINE LUBRICATING SYSTEM
charger components. The oil filter bypass valve opens
3-57. General
when filters become restricted and allows oil to bypass
filters and flow directly to outlet passage. Unless filters
a.
Description.
A pressurized lubricating
become restricted, or oil viscosity is extremely high,
system, filtered and strained, with full flow by-pass
only filtered oil is furnished to the engine bearings. The
features is pumped from crankcase oil pan through
bypass valves assure a supply of lubricating oil any time
strainer and filter to passages designed to distribute oil
filter, cooler, or both may become clogged.
where it is most required. Differences are described
under paragraph devoted to each engine.
3-58. Engine Oil Filters
b.
Engine Model 687C-18-ES. A gear type oil
pump is mounted in bottom of oil pan at rear of engine.
a.
For Engine Model 687C-18-ES.
This pump forces oil to front of engine through a supply
line and cored passage to oil strainer; through strainer to
(1) Removal and installation.
manifold on each side of engine, where it is distributed
to all moving parts by means of holes drilled at strategic
points.
Exhaust valve rocker arms are lubricated
through an external line which supplies oil to end rocker
arm shaft. The remaining rocker arms are lubricated by
means of short jumper connections. The blowers are
also lubricated through external lines. Drain plugs for
draining system are located on bottom of oil pan, and
side of oil strainer housing.
c.
Engine Model D333TA. A two section oil
pump contains a scavenge pump and a pressure pump.
Oil that does not return to pan is collected by a
scavenge tube and then returned to oil pan. Oil is
pumped from oil pan to oil cooler, then to oil filters,
except on starting, when it is bypassed through an
external line to the filters, cutting out the cooler for cold
oil. When engine is first started, unfiltered oil is passed
by the turbocharger lubrication valve to turbocharger
components by an external line. As the oil temperature
increases, the oil cooler by pass valve closes, forcing oil
through cooler to filter bases. As oil pressure is built up
Figure 3-36. Engine oil filters (for engine 687C-18-
through filters, the turbocharger lubrication valve closes
ES), removal and installation.
off flow of unfiltered oil and provides filtered oil to turbo
3-49
