Page 290 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

Setting
Timing Device Travel

Run the pump at 1250 rpm and check the travel of the timer piston. If the travel is not correct, adjust the supply
pump (vane pump) pressure within specified limits or ascertain thickness of timing device shims .
Vane Pump Pressure

Run the pump at 1250 rpm and check the vane pump pressure. It should be 3.9 to 4.5 kgf/cm². If it is less than
the specification, use 03-KDEP 1092 to press the plunger down. If the pressure is more, use 03-KDEP 1083 to
remove the pressure control valve from the pump. Dismantle the pressure control valve using KDEP 1027 and
press the vent plug outward. Then assemble the pressure control valve and press the bracing sleeve using KDEP
1093.
Full Load Delivery
Run the pump at 1250 rpm and adjust the full load screw to get a delivery quantity of 14.8 to 15.3 cc for 500
strokes.
Idle Speed Regulation
Run the pump at 375 rpm and place the control lever against the idle speed adjusting screw. Set the delivery
quantity to 5.3 to 6.3 cc for 500 strokes by adjusting the idle speed adjusting screw.

Maximum Speed Regulation
Run the pump at 2350 rpm and place the control lever against the speed adjusting screw. Set the delivery quantity
to 15.3 to 18.3 cc for 500 strokes by adjusting the maximum speed adjusting screw.

Starting Quantity Checking
Run the pump at 100 rpm. The delivery quantity should be 22.5 to 42.5 cc for 500 strokes. If not, readjust the ‘MS’
dimension.

Testing
Timer Travel
Run the pump at 800 rpm. The Timer travel should be 0.8 to 1.6 mm. Run the pump again at 2000 rpm. The timer
travel now should be 6.3 to 7.1 mm. If not, replace the timer spring and check the timer piston for wear, or the
supply pump pressure.
Vane Pump
At 800 rpm of the pump, the vane pump pressure should be 2.6 to 3.2 Kgf/cm² and at 2000 rpm it should be 5.9
to 6.5 Kgf/cm². If not, check for wear/correct assembly of vane pump or check for wear on the pressure control
valve spring.
Overflow Quantity

Run the pump at 500 rpm and measure the overflow quantity for 10 seconds. It should be 42 to 84 cc. At 2250
rpm it should be 55-138 cc/. If not, check/replace the throttle banjo.
Fuel Deliveries

End Stop
Keep the control lever against the maximum speed adjusting screw and run the pump at different rpm as specified
in the test specification chart and check the fuel delivery quantities for 500 strokes. If there is a variation between
cylinders, change the delivery valve. If there is a variation in the quantities at different rpm, adjust the full load
screw and maximum speed adjusting screw.

Idle Stop
Keep the control lever against the idle adjusting screw and check the delivery quantities at the rpm specified in
the test specification chart. If they are not correct, adjust the idle adjusting screw.
Solenoid

Use a battery/D.C. supply of 10 to 12 volts and check for the correct functioning of the solenoid. If it does not
perform satisfactorily replace the solenoid.

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CITS : Automotive - Mechanic Diesel - Exercise 15.6