C-98
35 Series 4WD, Model - 3535, 4035, 4535 and 5035 SM June’08
4. Servicing the fuel filter
1. To drain water in fuel, loosen the drain plug upto
1 or 2 turns. During loosening drain plug, place a
small tray to collect the water coming from
pipe (C). Retighten the drain plug by hand.
2. It is recommended to replace the fuel filter every
500 hrs.
3. To remove Filter, unscrew the filter (D) from
Adapter (E).
4. Check O'rings of fuel filter for any crack / damage.
Smear oil on the new O'ring before installation.
5. Clean the Adapter with clean diesel from inlet and
outlet. Ensure no dirt, foreign particles entangled
in flap valves or filter head.
6. Assemble the new filter. Do not over tighten.
7. Prime the system and bleed the filter. Tighten the
bleeding screw.
5. Removal
1. Close the fuel tap at the tank end.
2. Disconnect all fuel pipes at the filter.
3. Remove the cap screws securing the filter to the
manifold and remove the filter.
6. Installation
1. Reverse the removal procedure.
2. Bleed the fuel system.
G. INJECTORS
1. Description
The performance of the modern High speed engine
depends largely upon proper functioning of its fuel
injection system. For efficient combustion and optimum
engine performance it is imperative that the injection
nozzles are always in functionally satisfactory condition
so that accurately metered quantities of fuel from the
injection pump are injected into the engine combustion
chamber as follows :
a. A perfectly atomized condition for proper mixing
of the fuel with compressed air. The fuel delivery
is exactly timed.
b. Correct spray dispersion and pattern.
c. Under proper specified opening pressure & temp.
The injection nozzles are designed to ensure that fuel
injected into the combustion chamber mixes with the
compressed air. At the end of the injection the nozzles
must not only close instantly but completely as otherwise
any after - injection will lead to coking and will affect
atomization and induce on irregular exhaust beat. Nozzle
coking can also disturb spray from the prescribed
directions.
F
A
D
C
B
G
E
Fig. 3
Fuel System
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