Technical data

INSPECTION
(1)Fuel Filter (Secondary)
Check the element for clogging and dirtiness. Replace if it is, seriously damaged. Regular element
replacement interval is 200 hours. Replace the element more frequently if engine operating condition
is severe.
(2)Fuel Pump
(a)Filter and Valve
Check the filter element for clogging and dirtiness and the valve plunger and spring for damage and
dirtiness. Element replacement interval is same as above.
(b)Checking for Normal Function
Turn the ignition switch to ON and confirm that the fuel pump clicks. If no click is heard, try
connecting a 12V battery to the fuel pump directly. If still silent, replace the fuel pump
assembly. If the fuel pump clicks when directly connected to the battery, check the fuse,
connectors and wiring for defects.
(c)Checking Pump Delivery
Test the pump by connecting a battery and fuel lines
as illustrated. Fuel delivery must be 225cc or
more every 15 seconds.
(3)Fuel Injection Pump
(a)Delivery Valve Seat
Check the contact surface of the delivery valve. To
test, assemble the delivery valve and seat and
apply a 150kg/cm2 fuel pressure to the
assembly. The fuel pressure must not drop
within five seconds.
(b)Plunger Barrel
(1) To test the fuel-tightness of the plunger, use a tester. Increase fuel pressure up to 300kg/cm2
and check the time required for fuel pressure to drop from 200kg/cm2 to 100kg/cm2. The
time must not be less than six seconds.
(2) Check the plunger for seizure, damage and rust. Also check to see if the plunger slides
smoothly when inserted into the barrel. If defective, do not repair it but replace as a matched
set with a new set.