Page 116 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

• Hook the governor spring eyes on and to the tension lever and the other end to the rocker of the swivelling
lever.
• Fix the control lever (stop lever) to one end of the shaft of the swivelling lever.
• If it is a special stop device, fit it on the same side of control rack.

• Screw in the torque control device (adaption capsule) into the tension lever observe the lever end of the
tension lever bearing against full load stop screw.
• Fix the supplementary idling spring on the governor cover.
• Fix the plug and supplementary idling speed spring screw them inside the governor cover and also screw the
stop screw or idling stop screw in its place.
• Check the control rack movement by pushing the control rack to stop, and release. The control rack must
automatically return to the full load position
• Fit the end cover.
• Rotate the camshaft till the cam that operates the feed pump is at the inner dead centre. Insert the gasket and
fix the feed pump with hexagonal nuts using lock washers.
• Fill the pump and governor with the recommended oil up to level
• Phasing and calibration of fuel injection pump Select the correct calibration chart
• Use only recommended calibration oil
• Carry out all tests in the indicated direction of rotation as seen from the drive end. Check injection order (cam
sequence) by rotating pump in the specified direction.
• Ensure that for all pump elements, the plunger clearance at TDC (tappet clearance) is at least 0.2 mm. Check
whether control rack moves freely.
Mounting the pump on test bench
• Mount pump on test bench using suitable mounting and clamping devices. Connect inlet flexible pipe.
• Run pump at low rpm and bleed.
• Connect high pressure pipes and run the pump at 200 rpm until pump and test injectors are working perfectly.
Fix control rack measuring device and set it to ‘O’ when control rack is in STOP position.
Adjustment of commencement of delivery
• The ‘commencement of delivery’ takes place when element plunger just covers the in-take port on its upward
stroke from BOC position.
• It this point, there is no flow of oil from pump gallery to the element as a result of which the oil flow from swan
neck pipe fitted to the test injector cuts off.
• The prestroke is the plunger travel from BOC position to the port closure (commencement of delivery).
To set the prestroke
• Move control rack to about 12 mm position and open vent screws of test injectors. Set the change-over valve
of test bench to commencement of delivery position.
• In this position, oil supply is at about 45kgf cm. pressure, sufficient to keep delivery valves in open position.
• Rotate pump in proper directing with lever until the element plunger next to the drive end (No. 1 cylinder) is at
BDC position.
• Fix prestroke measuring device so that the feeler rests on roller tappet of No. 1 cylinder.
• Set the dial indicator to ‘O’ Rotate pump in proper direction until the test oil just stops flowing through test
injector swan neck pipe.
• Read the dial indicator.
• The value should be as specified for prestroke in the respective calibration chart.

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CITS : Automotive - Mechanic Diesel - Exercise 5.6