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Evidence Guide: MEM18029B - Tune diesel engines

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

MEM18029B - Tune diesel engines

What evidence can you provide to prove your understanding of each of the following citeria?

Compression test engine

  1. Injectors are removed and fuel system for each cylinder is isolated correctly.
  2. Appropriate adaptors are selected and fitted.
  3. Readings obtained are accurately recorded and interpreted.
  4. Compression readings are corrected for adaptor used.
Injectors are removed and fuel system for each cylinder is isolated correctly.

Completed
Date:

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Appropriate adaptors are selected and fitted.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Readings obtained are accurately recorded and interpreted.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Compression readings are corrected for adaptor used.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Perform tune up

  1. If applicable, firing pressures are accurately determined and adjusted to specification.
  2. Engine is started, operated, loaded, and shut down safely.
  3. Test equipment is correctly applied.
  4. Air restriction, boost, back pressure and flow tests are performed according to manufacturers' recommendations.
  5. Readings are recorded and variances from specifications are correctly determined.
  6. Density of exhaust smoke is correctly determined.
  7. Valve clearance and/or timing is correctly adjusted.
  8. Injection pump or injector timing is adjusted to specification.
  9. Governor rack travel, torque spring load limit, overspeed trips, aneroid or fuel ratio control is adjusted to specification.
  10. Injector opening pressure is correctly determined and adjusted.
If applicable, firing pressures are accurately determined and adjusted to specification.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Engine is started, operated, loaded, and shut down safely.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Test equipment is correctly applied.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Air restriction, boost, back pressure and flow tests are performed according to manufacturers' recommendations.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Readings are recorded and variances from specifications are correctly determined.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Density of exhaust smoke is correctly determined.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Valve clearance and/or timing is correctly adjusted.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Injection pump or injector timing is adjusted to specification.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Governor rack travel, torque spring load limit, overspeed trips, aneroid or fuel ratio control is adjusted to specification.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Injector opening pressure is correctly determined and adjusted.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package.

Overview of assessment

A person who demonstrates competency in this unit must be able to tune diesel engines. Competency in this unit cannot be claimed until all prerequisites have been satisfied.

Critical aspects for assessment and evidence required to demonstrate competency in this unit

Assessors must be satisfied that the candidate can competently and consistently perform all elements of the unit as specified by the criteria, including required knowledge, and be capable of applying the competency in new and different situations and contexts.

Context of and specific resources for assessment

This unit may be assessed on the job, off the job or a combination of both on and off the job. Where assessment occurs off the job, that is the candidate is not in productive work, then an appropriate simulation must be used where the range of conditions reflects realistic workplace situations. The competencies covered by this unit would be demonstrated by an individual working alone or as part of a team. The assessment environment should not disadvantage the candidate.

This unit could be assessed in conjunction with any other units addressing the safety, quality, communication, materials handling, recording and reporting associated with tuning diesel engines, or other units requiring the exercise of the skills and knowledge covered by this unit.

Method of assessment

Assessors should gather a range of evidence that is valid, sufficient, current and authentic. Evidence can be gathered through a variety of ways including direct observation, supervisor's reports, project work, samples and questioning. Questioning techniques should not require language, literacy and numeracy skills beyond those required in this unit of competency. The candidate must have access to all tools, equipment, materials and documentation required. The candidate must be permitted to refer to any relevant workplace procedures, product and manufacturing specifications, codes, standards, manuals and reference materials.

Guidance information for assessment

Required Skills and Knowledge

Required skills

Look for evidence that confirms skills in:

reading, interpreting and following information on written job instructions, specifications, standard operating procedures, charts, lists, drawings and other applicable documents

planning and sequencing operations

checking and clarifying task-related information

removing injectors from each cylinder and isolating the fuel system

fitting appropriate adaptors to the cylinders

obtaining and recording compression readings and correcting readings for the adaptor used

where appropriate, adjusting firing pressures

starting, operating, loading and shutting down the engine safely in accordance with standard operating procedures

using test equipment

selecting and conducting appropriate tests

recording test readings

identifying variations from specifications of any test result

determining the density of exhaust smoke

adjusting valve clearance and/or timing

adjusting injector pump or injector timing to specification

adjusting the governor rack travel, torque spring load limit, overspeed trips, aneroid or fuel ratio control to specification

adjusting the injector opening pressure to specification

Required knowledge

Look for evidence that confirms knowledge of:

the procedures for removing injectors from cylinders and reasons for isolating the fuel system

appropriate adaptors and reasons for using adaptors

the procedures for fitting adaptors to the cylinders

the procedures for compression testing diesel engines

the procedures for recording compression readings

the procedures for comparing the compression readings with specifications and identifying any deviations

the likely causes of any detected deviations from specification

the corrections required for compression readings to take account of the adaptor used

the procedures for adjusting firing pressures

the procedures for starting, operating, loading and shutting down diesel engines

hazards and control measures associated with starting, operating, loading and shutting down diesel engines, including housekeeping

the test equipment and procedures to be used in the tuning of diesel engines

the manufacturer's recommended tests and reasons for conducting the tests

the procedures for recording test results

the procedures, equipment and techniques for determining exhaust smoke density

the procedures for adjusting valve clearances and/or timing

the procedures for adjusting injector pump and injector timing

the timing and pressures to be achieved

the procedures for adjusting the governor rack travel, torque spring load limit, overspeed trips, aneroid or fuel ratio control

the governor specifications

the procedures for adjusting injector opening pressure

safe work practices and procedures

Range Statement

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.