Page 117 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

• If not, adjust tappet screw. Set the pointer on the graduated drive to a position convenient for checking and
adjusting other elements of the pump. Rotate pump camshaft further until No. 1 cylinder reaches TDC position.
Set the dial indicator to ‘O’ again. Check the plunger clearance at TDC (tappet clearance) on the dial indicator
by lifting the roller tappet with a screw driver. The clearance should be minimum 0.2 mm.
• Remove prestroke measuring device.
• ‘Commencement of delivery of other elements should be adjusted according to the cam displacement angles
starting from No. 1 cylinder. Rotate camshaft through 90 for 4 cylinder and 60 for 6 cylinder
• The plunger clearance at TDC (tappet clearance) should be checked individually immediately after setting
the commencement of delivery. If it is less than 0.2mm,the particular tappet should be re-adjusted within
permissible tolerances, if necessary, the setting of the No. 1 cylinder should-be re-done.
Adjusting the delivery quantity
• Set the change over valve of the test bench to delivery quantity test position and set the fuel gallery pressure
to 1.0 kgf/cm .
2
• Set the control rack measuring device to the specified value and run the pump at the specified Adjust the
control sleeve of the elements so as to obtain equal’ specified delivery values.
• A final correction of the setting, in particular the spread in delivery, can be carried out while setting the full load
quantity.

Spread in delivery
• The delivery from all the cylinders should be equal for basic setting. It should be ensured that the spread
remains as small as possible for the other measurements as this is the yard stick to assess the serviceability
of
• Elements and delivery valves. The maximum spread specified (0.3 or 0.4 CC for 100 strokes) is primarily
applicable for elements and delivery valves which have been in service for some time.

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CITS : Automotive - Mechanic Diesel - Exercise 5.6