Section 6
LUBRICANTS, FUELS & COOLANT
Providing and maintaining an adequate supply of clean, high quality fuel, lubricating oil, grease
and coolant in an engine is one way of insuring long life and satisfactory performance.
FUELS
HS-Diesel oils recommended for use on S 3.8 G
series diesel engines confirm to following
specification.
IS 1460
DIN 51601 or equivalent
Do not mix kerosene with diesel as a cost
reducing measure. This mixture has poor
lubricating properties. It causes faster wear and
tear of fuel injection equipment components under
normal operating conditions.
Cleanliness of the fuel influences the efficiency and
life of the fuel filters and fuel injection equipment.
It is, therefore, more economical to fill clean fuel
into the tank. All precautions should be taken to
ensure that no dirt enters the tank while filling the
fuel.
Special precautions if fuel is stored in drums.
1. Do not roll the drum to the engine to pump
the fuel into the tank. The drum must be
kept standing for at least 24 hours to allow
impurities to settle down.
2. When placing the suction pump into the drum
see that approximately 15 cm distance is left
between the bottom of the drum and the end
of the suction pipe, so that sediments (dirt,
mud, water) are not sucked in.
3. The suction bore at the end of the suction
pipe must be protected by a fine mesh
sieve.
4. Put a piece of clean flannel cloth into filter
opening.
5. Keep suction pump free from dust. Do not
place it on the floor.
To ensure that clean fuel is always available for
refuelling it is advisable to set up a large tank
(containing about 500 to 1000 liters, according to
requirement) at a suitable place, thus establishing
a small and cheap private filling station. Before
refilling, drain off the sediments through the drain
cock provident at the bottom of the tank.
If the diesel fuel has been split, the affected spots
can be cleaned by using a mixture of 25-50%
vinegar and 75-50% water (depending on the
degree of contamination). This will help go get rid
of the offensive adour.
At very low temperatures fluidity of diesel may
become insufficient to paraffin separation. It is
therefore, necessary to mix supplementary fuel
with summer or winter grade diesel. The
supplementary fuel to be used is kerosene of
aviation turbine fuel.
Ratios for mixing of supplementary fuel and diesel
are shown in table :
Ambient Percentage
temperature Summer Supple-
0C grade mentary
diesel fuel
up to 0 100
0 to -10 7030
Ambient Percentage
temperature Winter Supple-
0C grade mentary
diesel fuel
up to -15 100 0
-15 to -20 70 30
-20 and below 50 50
Care should be taken that diesel and
supplementary fuel are thoroughly mixed before
filling.
COOLANTS
Presence of dirt in coolant chokes up radiator,
water passages in cylinder head and crankcase,
thereby causing overheating of engine.
Workshop Manual
S3.8 Engine
A030K288 (Issue 2)
01-2010
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