Page 279 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

Adjustment
A size pumps by adjusting the roller tappet adjusting screws or by varying the thickness of shims in the case of
3000 series pumps.

‘P’ size pumps by varying the thickness of shims under the element delivery valve assembly flange.
• Cam sequence
Commencement of delivery of other elements should be adjusted according to the cam sequence starting from
cylinder No. 1. Tolerance of 0.5 is permissible on the cam displacement angles.

Example:
For 4 cylinder: 90° 0.5°
For 6 cylinder: 60°+ 0.5
The tappet clearance in each cylinder should be checked immediately after setting (on ‘A’ size pumps minimum
0.2 mm).
• Basic setting
The basic setting of fuel delivery is considered as pre-setting uniform setting of elements- in order to check the
condition of element- delivery valve’ combination.
The fuel delivery given under ‘delivery quantity column is the average value for all cylinders and should be as
close as possible within the specified.range.

‘Maximum spread in delivery quantity’ means the difference between the individual cylinders in one pump.
Adjustment
‘A’ size pumps by adjusting control sleeve
‘P’ size pumps by turning the element-delivery valve assembly flange
After basic setting of the pump is over, assemble governor cover assembly and proceed as per the recommended
sequence of operations given below.(Fig 13)
Note: Figures in brackets indicate the corresponding test specifications column number.

Fig 13

1 Control rack travel (1)
Check control rack for free movement, release full load stop completely by removing the cap (50/51). Fix circular
control rack travel measuring scale (H-S/EFEP 38) on pump inspection window and fix the pointer. Push control
rack to stop position and set circular control rack travel measuring scale to ‘0’ Release the control rack; it
shouldmove to the position as specified (Column 1).
2 Tightness test (2)
Connect vacuum pump (03-EFAW 16), U-tubemanometer (H-S/EFEP 3) connections to thegovernor. By operating
the vacuum pump buildup the specified vacuum (Fig. 2). Note the timefor the specified drop in vacuum. The time
shouldbe as specified. If leakage is observed rectify.

262

CITS : Automotive - Mechanic Diesel - Exercise 15.4