REPAIR OF SUPPLY AND EXHAUST GASES. Checking the fuel pump
One way to check the functioning of the pump
is the following.
To foster the pump head fitting, connect the receiver having
inner diameter of 4 mm, the second end of which
Immerse in a container of gasoline. Then manually by pressing a lever,
bring into force the diaphragm. With this test, the petrol
to a height of 850 mm must begin no later than after 20
full swing lever pump.
Check nasossa can work on a special apparatus,
allowing to work on a special pump lever
eccentric. In such a setting must be precisely followed
size and location of cam
with respect to lever the pump in accordance with its montage
on the engine.
When tested on a special installation in the suction of gasoline
the tube with an inner diameter of 4 mm height 850 mm and
speed 120 1 \ min flow of gasoline should not start
later than 10 seconds after starting the pump.
When testing the pump must generate pressure within 225-275
mm Hg. of Art. and a vacuum of 300 mm Hg. of Art. After
termination of the pump pressure and vacuum for controlling
Instruments should be kept for 10 s.
Pump speed with shaft drives a 1800 \ minutes
must be at least 40 liters \ hour.
If the pump does not meet the above requirements,
disassemble it and carefully inspect the details and, if necessary
Before installing the engine repaired and tested
pump at the time of its attachment to the cylinder head, check
state of cardboard shims under the
flange of the pump housing and a heat-insulating lining.
Damaged gaskets, replace with new ones.
The final tightening of the special (long) nuts on the studs
fixing the pump housing to the cylinder head
do with the engine warmed up to normal
operating temperature. At the beginning of operation
engine with a reconditioned pump is recommended
periodically pull (crosswise) screws
pump head to his body.