Check Air Connection
Check air connection to air cleaner and air
crossovers to assure all are secured.
Check Engine Coolant Supply
Remove the radiator cap and check engine coolant
level. Add coolant as needed.
COOLING SYSTEM
Check and top up radiator with Specified coolant
if required. If the coolant starts boiling, there
could be a defect in the cooling system which
may be on account of :
Always use genuine radiator cap. A proper radiator
cap firmly fitted maintains pressure in the cooling
system and makes the engine more efficient by
permitting a slightly higher operating temperature.
The vacuum in the radiator is relieved by a valve
provided in the cap. The radiator pressure cap
value is 7 PSI. Degrease and clean cooling
system regularly.
FUEL SYSTEM
The photograph shows different points for fuel
system. The description of these points are,
1. Bleeding screw primary filter
2. Bleeding screw secondary filter
3. Drain plug secondary filter.
4. Drain plug primary filter.
Fig. 1-2: Engine Fuel Filter
5. Bleeding screw on fuel injection pump.
Fuel System Bleeding
If the performance of the engine is affected
due to presence of air in the fuel system
(commonly known as air lock) the defect can be
removed by bleeding the fuel system as follows
:
a. Loosen bleeding screw on primary filter.
b. Unscrew lift pump lever knob and prime till
diesel coming out of the bleeding screw of
the primary filter is free from any air bubble.
c. Tighten bleeding screw and plunger knob.
d. Repeat this process on bleeding screw on
the secondary fuel filter and then on the fuel
injection pump gallery. If the air bubbles
continue coming out of the bleeding screws,
either there is less diesel in the tank or there
is an air leak in the suction pipe. Check and
rectify.
Overflow Valve
In case the engine running is found to be irregular
or shows a tendency to fall or there is loss of
power, this may be due to faulty operation of the
overflow valve in the fuel filter system.
If necessary, replace it.
Nozzle Operation
If the engine is running irregularly or there is a
diesel knock or the fuel consumption is abnormal,
Workshop Manual
S3.8 Engine
A030K288 (Issue 2)
01-2010
i. Less coolant or dirt/scale having
accumulated inside cooling water
passages, especially in the radiator cores.
ii. Choking of the radiator air passages due to
foreign material or damaged radiator fins.
iii. Loss of coolant by evaporation and
leakage through defective radiator cap.
iv. Loose water pump drive belt.
v. Coolant leakage from the cooling system.
Caution : Do not add cold water too
quickly to hot engine.
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