Page 322 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

the idler cont gear and the gear on the control lever. Check the delivery valve and its seat by checking the tension
of the delivery valve return spring. The FIP is assembled and fitted on the testing machine and taken as per the
three testing charts of the FIP.
Safety precaution

1 Phase Angle: Testing Diesel is delivered from one pump element and diesel is delivered from another pump
element after a certain interval or angle. The distance or angle between these two successive injections is
called the phase angle. So setting it is called phase angle setting.
While setting it check head clearance i.e. clearance from plunger top surface to delivery valve seat base. It is
set by increasing or decreasing the number of adjusting screws or sims from 0.5 mm to 1.00 mm.

2 Calibration: Each pump element delivers a specific volume of diesel at a specific speed at a specific interval.
This diesel is taken in measuring tubes and the level of diesel in each tube is checked. This diesel should
be same in all tubes. The volume should not vary by more than 0.4 cc. If so, setting the delivery quantity by
loosening the screw on the trolled cone and changing the position of the plunger helix as required is calibration.
3 In Stop, Idling, Maximum as well as Speed Lock setting, the traveling position of the control rod is set to the
Stop Idling Maximum position. Also, speed lock means setting the maximum distance limit of the control rod,
so that the vehicle will not accelerate beyond that distance covered in a specified period of time. This is called
speed lock.
When servicing solenoid valve controlled distributor type pumps and start assist systems, it’s crucial to
prioritize safety to prevent accidents and ensure the well-being of yourself and others. Here are some safety
precautions to consider:
1 Personal Protective Equipment (PPE): Always wear appropriate PPE such as safety glasses, gloves,
and protective clothing to protect against chemical exposure, electrical hazards, and mechanical injuries.
2 Isolation and Lockout-Tagout: Before servicing any equipment, ensure it is properly isolated from power
sources and energy hazards. Follow lockout-tagout procedures to prevent accidental startup or release of
stored energy.
3 Ventilation: Work in a well-ventilated area or use exhaust systems to prevent the buildup of fumes, vapors,
or gases from cleaning solvents or fuels.
4 Handling Chemicals: Handle cleaning solvents, fuels, and other chemicals with care, following
manufacturer recommendations and safety data sheets (SDS). Avoid skin contact and inhalation of vapors.
5 Electrical Safety: When working on electrical components or systems, ensure power is turned off and
circuits are de-energized. Use insulated tools and avoid working alone in case of emergencies.
6 Mechanical Hazards: Be mindful of moving parts, sharp edges, and pinch points when disassembling or
reassembling equipment. Follow proper lifting techniques and use appropriate tools to prevent injuries.
7 Fire Safety: Keep fire extinguishers nearby and be aware of potential fire hazards, especially when working
with flammable materials such as fuel or cleaning solvents.

8 Proper Equipment Use: Use equipment and tools only for their intended purposes and in accordance with
manufacturer instructions. Inspect tools for damage before use and replace worn or damaged equipment.
9 Training and Supervision: Ensure all personnel involved in servicing procedures are properly trained and
supervised. Provide clear instructions and guidelines for safe work practices.
10 Emergency Procedures: Familiarize yourself with emergency procedures and evacuation routes. Have a
first aid kit readily available and know how to respond to accidents or injuries.

By adhering to these safety precautions, you can minimize risks and ensure a safe working environment when
servicing solenoid valve controlled distributor type pumps and start assist systems.

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CITS : Automotive - Mechanic Diesel - Lesson 96 & 97