SECTION N
Fuel System
Introduction
The equipment for the supply, filtration and delivery
of fuel to the engine consists of a fuel tank, a diaphragm
type fuel lift pump, fuel filters, a distributor type fuel
injection pump and four injectors. There is also a small
reservoir to provide a gravity feed to the cold starting aid
in the air intake manifold.
Air drawn into the engine through the induction
manifold is filtered by a perforated mild steel gauze.
This method of filtration is satisfactory for all
applications except canal, river or dockside work where
dust or other foreign matter may be present in the
atmosphere. In this case a dry type air cleaner with
cleanable element is preferable.
As with all diesel engines, particular stress is laid on
the importance of clean, filtered fuel oil if longevity and
trouble-free operation is to be obtained.
AIR FILTERS
The time period for cleaning air filters should be
governed by the conditions under which the engine
operates.
The correct maintenance of the air filter will greatly
assist in reducing bore wear, thereby extending the life
of the engine.
FUEL FILTER
The fuel filter is of the paper element type, therefore,
no attempt should be made to clean the element. It
should be renewed when periodical maintenance is
being carried out.
The filters fitted to earlier engines have a separate
element positioned inside a bowl whereas filters fitted to
later engines have an encapsulated element held
between the filter head and the filter base.
The period for changing the element will largely
depend upon the quality and condition of the fuel
available. Under normal conditions the element should
be renewed every 1,000 hours. This period should be
decreased accordingly if unavoidable contamination of
the fuel is being experienced.
To Renew Earlier Type Filter Element
1.
Thoroughly clean the exterior of the filter bowl
and cover.
2.
Unscrew the bolt in the centre of the filter top
cover (see Fig. N.1).
3.
Take the filter bowl and element assembly away
from the filter cover (see Fig. N.2).
4.
Throw away the dirty element. Remove the
lower element scaling washer, seal seating and
spring from the bowl.
5.
Thoroughly clean the inside of the bowl
particularly the centre tube.
6.
Fit the spring and seal seating to the bowl.
Examine the lower seal, renew if necessary and
refit to the bowl. Place the new element in
position in the bowl.
7.
Ensure that the element to top cover and the
bowl to top cover seals are in good condition, if
not, replace with new seals.
8.
Bleed the fuel system as detailed on Page N.9.
Fig. N.1.
Removing the Fuel Filter Bowl Securing Bolt.
(Earlier Type)
