Table of Contents
Advertisement
ENGINE: FUEL SYSTEM
83
Replacing Cleaner Element.
For good performance of engine the air cleaner
element should be renewed every 6,000 miles
(10,000 km) at least.
Proceed as follows:
unhook three fasteners (1, fig. 138);
remove air cleaner cover;
withdraw element and replace
by
a new one.
In areas where dusty roads are prevalent, renew
cleaner element at shorter intervals.
FUEL PUMP
A poor delivery of fuel to the carburetor may be
due to a fault in the fuel pump or related lines.
Check:
- pump body screws (I, fig. 139) and upper
cover screws
(9)
for a loose condition;
- fuel pump lines for restrictions, chafing or
loose connectors.
Another source of fuel delivery troubles may be
the
breakdown of some pwnp components:
if
so
disassemble the fuel pump.
4
5~---
Fig. 139 • Layout of fuel pump components.
1. Pump bodies interlocking screws. - 2. Filter gauze. - 3. Con-
nector. - 4. Upper body. - 5. Diaphragms. - 6. Spring. - 7. Lower
body. - 8. Plain washer. - 9. Cover mounting screw. - 10. Pump
cover. - 11. Valve housings locking screws. - 12. Valve housings. -
13. Valve plugs.• 14. Plug seals .• 15. Suction and delivery valves.•
16. Valve springs. - 17. Operating lever reaction spring.• 18. Yoke
lever. _ 19. Thrust washer. - 20, Yoke lever pin.
Fig. 140 - Setting fuel pump push rod projection.
A. Gasket .0106" to .0130" (0.27 to 0.33 mm) thick. - B. Gasket .0276"
to .0315" (0.7 to 0.8 mm) thick.
Figure H-l.5 mm
=
.0394" to .0591" is jutting specified for the
push rod.
Cleaning and Inspection.
Remove the fuel pump from crankcase and take
it apart.
Thoroughly wash
all
components in gasoline and
blow them dry with compressed air.
Check valves (15, fig. 139) for evidence of damage.
Check valve springs
(16)
for weakness or cracks.
Check to see that the diaphragm reaction spring
(6)
and the operating lever spring
(17)
are not
unserviceable or distorted.
The diaphragm
(5)
should show no signs of
warpage or stiffness.
Wash the operating lever (18) and pin (20) in
kerosene and oil them on assembly.
Always replace
all
pump seals.
Coat seals with a
film
of grease prior to fitting
in
place.
Installation and Adjustment.
To assure the correct operation of the fuel pump,
adjust the push rod projection before installing the
pump on crankcase.
Proceed
as
follows:
- fit the insulating spacer into its seat with a
gasket (B, fig. 140) in between;
- fit the gasket (A, fig. 140) and slide in the
push rod;
- turn about the camshaft with the lobe positioned
as shown in fig. 140;
Advertisement
Table of Contents
