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Title / Demonstrate knowledge of engine crankshaft and camshaft machining procedures
Level / 4 / Credits / 4
Purpose / This theory-based unit standard is for people in the automotive machining industry. People credited with this unit standard are able to demonstrate knowledge of engine crankshaft and camshaft machining procedures.
Classification / Motor Industry > Engines
Available grade / Achieved
Guidance Information
Definitions
Company requirements refer to instructions to staff on policy and procedures which are documented in memo or manual format and are available in the workplace. These requirements include but are not limited to – company specifications and procedures, work instructions, manufacturer specifications, product quality specifications, and legislative requirements.
Machine instructions refer to specifications and instructions provided by the machine manufacturer for the set-up and correct operation of that machine.
Welding manufacturer instructions refer to specifications and/or instructions provided by the welding equipment manufacturer for the correct operation of the welding equipment provided by that manufacturer.
Outcomes and performance criteria
Outcome 1
Demonstrate knowledge of engine crankshaft machining procedures.
Performance criteria
1.1Measuring equipment for assessing the crankshaft condition is described in accordance with service information.
1.2The importance of cleanliness when carrying out an inspection of the crankshaft is explained in accordance with company requirements.
1.3Crankshaft inspection procedures are described in accordance with company requirements.
Rangevisual inspection, precision measuring, crack test, hardness test.
1.4Crankshaft straightening procedures to enable the machining to meet engine manufacturer specifications are described in accordance with company requirements.
Rangedetermining type and position of the bend, determining original method of heat treatment of the shaft, pre-heating, supporting the shaft and pressing, overcoming springback, relieving stresses.
1.5The procedure to set up and prepare the crankshaft for grinding is described in accordance with grinding machine instructions.
1.6Crankshaft regrinding operation is described in accordance with grinding machine instructions.
Rangestress relieving by heating, pre-grinding and post-grinding, ensuring fillet radii are maintained (for journals), dressing oil holes (for journals), checking hardness, finish grinding.
1.7The shaft pre-heating operation is described in accordance with company requirements.
Rangesuitable furnace to ensure even heating, at a temperature that will not affect any induction hardening.
1.8The build-up of the crankshaft journal is described in accordance with rebuilding machine instructions.
Rangejournals – metal spraying;
welding – short arc, submerged arc;
rechecking crankshaft for straightness.
1.9Journal polishing techniques are described in accordance with engine manufacturer tolerances.
Rangemain journals, big end journals, thrust surfaces.
1.10Replacement of oil plugs, and repairs to oil seal areas, snout, and keyway, are described in accordance with engine manufacturer tolerances.
1.11The importance of ensuring all oil passages are clear after machining is explained in accordance with company requirements.
1.12The importance of protecting the re-machined crankshaft against damage, corrosion, and foreign matter is explained in accordance with company requirements.
Outcome 2
Demonstrate knowledge of engine camshaft machining procedures.
Performance criteria
2.1Measuring equipment for assessing the camshaft condition is described in accordance with service information.
2.2The importance of cleanliness when carrying out an inspection of the camshaft is explained in accordance with company requirements.
2.3Camshaft inspection procedures are described in accordance with company requirements.
Rangevisual inspection, precision measuring, straightness, crack test, hardness test.
2.4Camshaft straightening procedures to enable machining to meet engine manufacturer specifications are described in accordance with company requirements.
Rangedetermining type and position of the bend, determining original method of heat treatment of the shaft, pre-heating, supporting the shaft and pressing, overcoming springback, relieving stresses.
2.5The procedure to set up and prepare the camshaft for machining is described in accordance with grinding machine instructions.
2.6The procedure to build up a camshaft lobe with hardfacing material is described in accordance with welding manufacturer instructions.
2.7Camshaft grinding and polishing procedures to engine manufacturer tolerances and specifications are described in accordance with company requirements.
Rangelobe profile, bearing journals, thrusts.
2.8Replacement of oil plugs, and repairs to oil seal areas, snout, and keyway, are described in accordance with engine manufacturer tolerances.
2.9The importance of ensuring all oil passages are clear after machining is explained in accordance with company requirements.
2.10The importance of protecting the re-machined camshaft against damage, corrosion, and foreign matter is explained in accordance with company requirements.
This unit standard is expiring. Assessment against the standard must take place by the last date for assessment set out below.
Status information and last date for assessment for superseded versions
Process / Version / Date / Last Date for AssessmentRegistration / 1 / 25 January 2008 / 31 December 2020
Review / 2 / 26 April 2018 / 31 December 2020
Consent and Moderation Requirements (CMR) reference / 0014
This CMR can be accessed at
MITO New Zealand IncorporatedSSB Code 101542 / New Zealand Qualifications Authority 2018