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OPERATION No MA. 173.0 : C/
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CHECKING THE PETROL PRESSURE USING APPARATUS 4005-T
Install apparatus 4005-T as shown above.
Disconnect reservoir return line from the carburettor and fit plug A on by-pass union ( 1 1.
Unscrew knurled knob B by approximately one and a half turns.
Start the engine
a) Check pressure of petrol at nil output :
b
c
-Fully screw down knurled knob B and read the stabilized pressure on the pressure gouge which should
be 325
mbors ( 47 psi ) maximum.
Check the proper sealing of the pump return valve
-Stop the engine.
There should be no sudden drop in pressure
Check the proper sealing of the carburettor needle valve :
- Unscrew knurled plug B and start the engine. Let it run for a few minutes.
-Stop theengine.
There should be no sudden drop in pressure.
= Remove apportus 4005=T and fit to carburettor the tank supply and return pipes (after having removed plug A 1:
CHECKING THE PUMP FOR LEAKS
- Close the pump return pipe.
-- Blow compressed air under pressure of 800 mbar
( 11.6 psi ) into Suction tube.
Immerse pump in a container filled with clean
petrol.
There should be no sign of dny leak.
Work on petrol gauge sender unit :
To work on the petrol gouge sender unit it is
necessary to drain the tank (drain plug 1, and
~emcwe it. It is held by double strap fixed by
nut (2 1.
Tightening of nut (2) = 15 mN ( 1.; m.kg )
( 10 3/4 ft.lb ).
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