Oil Pressure
Normal engine oil Pressure at temperature 221
0
F
(105
0
C) should be between 2.5 to 5 Kg/cm
2
at
rated speed and 1 to 2 Kg/cm
2
at low idle speed.
Engine Exhaust
The engine exhaust is a good indicator of engine
operation and performance. A smoky exhaust
may be due to a poor grade of fuel, dirty air
cleaner, overfueling or poor mechanical
conditions.
If engine exhaust is smoky, corrective action
should be taken.
High Altitude Operation
Some engines, particularly naturally aspirated, lose
horsepower when operated at high altitude
because the air is too thin to burn as much fuel
as at sea level. This loss is about 5 percent for
each 1800 ft. of altitude above sea level for a
naturally aspirated engine. Operate the engine
using a lower power requirement at high
altitude to prevent smoke and over-fueling.
Engine Shut-Down
Idle Engine A Few Minutes Before Shut-
Down It is important to idle an engine 3 to 5
minutes
before shutting it down to allow lubricating oil and
water to carry heat away from the combustion
chamber, bearings shafts etc. This is especially
important with turbocharged engines.
The turbocharger contains bearings and seals that
are subject to the high heat of combustion exhaust
gases. While the engine is running, this heat is
carried away by oil circulation, but if the engine
is stopped suddenly, the turbocharger temperature
may rise above 360
0
F. The results of extreme
heat may be seized bearings or loose oil seals.
Do Not Idle Engine For Excessively Long
Periods
Long periods of idling are not good for an engine
because combustion chamber temperatures drop
so low the fuel may not burn completely. This will
cause carbon to clog the injector spray holes and
piston rings and may result in stucked valves.
If engine coolant temperature becomes too low,
raw fuel will wash lubricating oil off cylinder walls
and dilute crankcase oil so all moving parts of the
engine will suffer from poor lubrication.
If the engine is not being used, shut it down.
Switch off the engine with the shut down coil
provided on engine.
Or
The engine can be shut down by pulling down
mechanical lever fitted on MICO pump.
Radiator
The radiator used on S-3.8-G engine are state of
the art aluminium radiators. These radiators are
with aluminium tubes & fins. The top and bottom
tank are of moulded plastic material. These
radiators do not have de-aeration cooling system.
Workshop Manual
S3.8 Engine
A030K288 (Issue 2)
01-2010
Note : Please note that oil pressure will
vary with temperature.
Note : Individual engines may vary from
above normal pressures. Observe and
record pressure when engine is new to
serve as guide for indication of
progressive engine condition. (High oil
pressure during start up is not a cause
for alarm.) For record purposes these
readings are more accurate and reliable
when taken immediately after an oil
change.
Warning : Do not remove the guarding
when the engine is in working condition
.
Warning : Inhalation of exhaust gases
can result in severe personal injury or
death. Use extreme care during
installation to provide a tight exhaust
system. Terminate exhaust pipes away
from enclosed or sheltered areas,
windows, doors and vents.
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