FUEL SYSTEM - N.14
Fig. N.19
Unscrewing Vent Plug on lop of Filter Cover.
pipe is square to the unions at each end as described
previously, no force will be needed to make a good joint.
Use only a standard open ended 5/8 in A.F. spanner.
If the union is tightened excessively the olive may
collapse and split. The same danger exists if the pipe is
not square to and central with the union.
When changing an atomiser always remove the pipe
entirely. Never disconnect one end only, leaving the
other end tight. Never bend the pipe.
PRIMING THE FUEL SYSTEM
The air must be vented from the fuel system
whenever any part of the system between the fuel link
and injection pump has been disconnected for any
reason, or when the system has been emptied of fuel.
Fig. N.20.
Slackening Vent Valve on Hydraulic Head Locking
Screw.
Fig. N.21.
Slackening Air Vent Valve on Governor Control Cover.
No attempt must be made to start the engine until
the injection pump has been filled and primed as serious
damage can be caused to the pump due to lack of
lubrication.
The method of priming detailed below, ensures that
only fuel which has passed through the paper filter
element can reach the interior of the pump.
To bleed the system, proceed as follows:—
1.
Unscrew by two or three turns, the vent plug
on top of the fuel filter cover (not the return
pipe to the tank). See Fig. N.1). Later type
fuel filters are self venting and do not have a
vent plug. Air vent the fuel filter by removing
Fig. N.22.
Operating the Hand Priming Lever
on the Fuel Lift Pump.
