Perkins New 1000 Series, Workshop Manual, Page: 194 / 290

20
194 Workshop Manual, TPD 1350, issue 3
New 1000 Series
To dismantle and to assemble 20-5
To dismantle
1 Clean the outside surfaces of the fuel lift pump.
2 Make a mark across the flanges of the two halves
of the pump to ensure correct relationship when the
pump is assembled.
3 Remove the cover (A1) and the gauze (A2).
Release the setscrews and separate the two halves of
the pump.
4 Turn the diaphragm assembly (A5) 90° to release
the pull rod from the link arm (A8) and remove the
diaphragm assembly. Remove the stem seal (A6), the
spring seat washer (A7) and the spring (A12) from the
pull rod. The diaphragm and pull rod assembly is
renewed as an assembly and no service is possible
on the diaphragm.
5 The valves (A4) are peened in and can be removed
with a suitable lever. Some of the peened metal will
have to be removed before the valves can be
removed.
6 To remove the link arm: Hold the rocker lever (A11)
in a vice and hit the body of the lift pump with a soft
face hammer to release the two retainers (A10). Be
careful not to damage the joint face of the pump body.
Remove the rocker lever, the pin (A9), the link arm
and the return spring. Check the components for wear
and other damage.
To assemble
1 Thoroughly clean the valve housings. Fit new seat
washers (A3) and push the new valves (A4) into
position. As the valves are the same, but one valve is
fitted in reverse of the other, it is possible to fit the
valves upside down. To ensure that the valves are
fitted correctly, fit them as shown in A. When the
valves are correctly fitted, peen the edge of the valve
housings in six places, evenly divided, to keep the
valves in position.
2 Fit the rocker lever (A11), pin (A9) and link arm
assembly (A8) into the bottom half of the lift pump. Fit
the return spring; ensure that the ends of the spring
are in their correct location.
3 With a light hammer and a suitable adaptor, fit two
new retainers (A10) in their grooves in the casing until
they fasten the pin. Peen the open ends of the
grooves to fasten the retainers in position.
4 Fit the diaphragm spring (A12) into its location
under the diaphragm (A5) and put the spring seat
washer (A7) and a new stem seal (A6) into position on
the pull rod. Ensure that the small diameter at the top
of the seal is on the round section of the pull rod.
Continued
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