Fuel Oil Filters; Fuel Lift Pump; To Renew The Filter Element; Testing The Pump In Position - Perkins 4.108 Workshop Manual

FUEL OIL FILTERS
The element in this f:lter is of the paper type ane.
therefore no attempt should be made to clean it. Its
life will be governed by the quality and condition of
the fuel passing through it. but under average con-
ditions the element should be renewed in accordance
with the recommended Periodical At:entions given on
Page C.2. This period would naturally be reduced if it
was apparent from the condition of the element if
removed and inspected. that conditions warranted it.
I On early engines the filter element is contained inside
I
a filter bowl, (Fig. N5). On later engines the filter
I element is situated between the filter head and the
I bottom cover, (Fig. N6).
To Renew the Filter Element
1 .
2.
3.
Clean the outside of the filter.
Release the setscrew in the centre of the filter
head.
Lower the filter bowl, (Fig. N5) or the bottom
cover, (Fig. N6) depending on which type of filter
is used and discard any fuel together with the
used filter element.
.J
J
J
1 4.
Clean the inside of the filter head and the inside
of the filter bowl or bottom cover.
5.
6.
7.
8.
Inspect the seals and renew them if they are
damaged.
Place the new filter element inside the bowl or
put the bottom cover on the bottom of the new
filter element. Offer up the filter bowl or element
assembly to fit centrally on the seal in the filter
head.
Hold in this position whilst the securing setscrew
is located and tightened. Do not overtighten.
Prime the fuel system as detailed in page N. 11.
FUEL LIFT PUMP
the
in Position
1. Disconnect the outlet pipe (lift pump to filter)
leaving a free outlet from the pump.
N5
AIR CLEANERS AND FUEL SYSTEM-N.3
N6
2. Rotate the engine and note if there is a well
defined spurt of fuel from the outlet port once
every two eng ine revolutions.
N7
NOTE: As an alternative the pump may be
operated by means of the hand primer as shown
in Fig. N.7, which should give the same result
every time the priming lever is operated. However
should the engine happen to have stopped in such
a position that the eccentric operating the lift
pump is in the maximum lift position, then it will
not be possible to operate the hand primer
properly. If such a condition arises the remedy is
to rotate the engine one complete revolution.