Page 278 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

Fig 11

Assembling of Excess fuel device
Screw in engaging bolt to the control rack, threaded guide bush to the pump housing.
Insert spring and push button into the housing and fix with pin . Caulk the pin at both ends and screw in this
assembly to the threaded guide bush , which is already assembled to the pump housing, with locknuts .
Tightness test
With stop lever, move the control rack to stop position, close the vacuum pipe connection with a finger and release
the stop lever (Fig 11). The control rack would move slightly and stop. If the governor is airtight, the control rack
would not move further towards full-load position unless finger is removed from the vacuum pipe connector.
Testing of pneumatic governor
Mount fuel injection pump, assembled with governor on test bench using suitable mounting brackets/ clamps
(Fig 12). Carry out all tests in the prescribed direction of rotation as seen from the drive end Maintain sufficient
quantity of lubricating oil in pump Prior to adjusting/testing the governor. fuel injection pump should be calibrated
without governing action .
• Setting the pre-stroke (port closing) . Port closure is reached when the oil flow from swan neck pipe fitted to
test injector cuts off.

Fig 12

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CITS : Automotive - Mechanic Diesel - Exercise 15.4