Cooling & Lubrication Chapter Review November 7, 2000By Laval Paradis - NSCC Cooling & Lubrication...

Cooling & LubricationCooling & Lubrication

Chapter Review

November 7, 2000By Laval Paradis - NSCC

Cooling & LubricationCooling & Lubrication

Chapter reviewImage viewingInteractive questionsClosing


Oil PumpsOil Pumps

1. What are we looking at in this picture?

2. What type of oil pump is this?

3. What is the maximum generic tolerance measurement between the gears?

1. Oil Pump2. Gear3. .005”


Oil PumpsOil Pumps

1. What are we looking at in this picture?

2. What type of oil pump is this?

3. What type of displacement is this pump?

1. Oil Pump

2. Rotor

3. Positive


Cooling SystemsCooling Systems

1. What are 2 types of cooling systems?

2. What are the 9 items listed in the diagram?

1. Air - Liquid


Cooling SystemsCooling Systems

One at a time, identify 1 component & a brief description of its purpose.


CoolantCoolant

1. What is the ideal coolant mixture ratio?

2. What is the boiling point of water?

3. What is the boiling point of a 67/33 mix?

1. 67/332. 212º F

3. 235º


Radiator CapsRadiator Caps

1. What is the purpose of a radiator cap?

2. Every PSI of pressure = how much of an increase in the boiling point?

1. Increase boiling point – Refill reservoir

2. 1.8ºC or 3.2ºF


Radiator CapsRadiator Caps

1. How many types of radiator caps are there?

2. What is the average pressure rating of today’s caps?

3. How do we test radiator caps?

1. 3 – constant/vent/closed2. 14-17 PSI3. Visual/Pressure test


Radiator HosesRadiator Hoses

1. What is the purpose of radiator hoses?

2. What element is used to make the hoses black?

3. Which hose is subject to the roughest service life?

1. Contain/Transport coolant

2. Carbon

3. Upper radiator hose


Hose ClampsHose Clamps

1. How many types of hose clamps may we see?

2. What are the names of these hose clamps?

1. 5 Types

2. Screw Tower – Spring – Rolled Edge – Worm Gear – Twin wire


ThermostatsThermostats

1. What are 2 functions of a thermostat?

2. When must a thermostat begin to open?

3. When must the thermostat be “fully” open?

1. Control temperature & Flow2. 3ºF above or below rating3. 20ºF above “start to open”.


Fans & Fan ClutchesFans & Fan Clutches

1. What 2 types of fans are shown?

2. Identify 2 types of downsides to these types of fans.

3. Why are fan shrouds used?

1. Flex - Clutch

2. Rob horsepower - Noisy

3. Efficiency –Engine placement


Electric Cooling FansElectric Cooling Fans

1. Why are electric fans used? 2. What components are needed

to make this system work? 3. Do these fans run while

driving?

1. Efficiency - Control

2. Sensor-Switches-Relays-Wiring-Fuse

3. Typically they shut down at 40km/hr & up.


Service & RepairService & Repair

Oil pressure sending units External leaks Corrosion Belts Component failure Fluid breakdown – lack of

maintenance Adjustments Electrolysis

Common Failures


Diagnostic AidsDiagnostic Aids

Oil pressure gauges Black light & dyes Pressure testers Thermometers – infrared Tension gauges DVOM Scanners Refractometer PH testers


ScenariosScenarios

Customer complained of no heat. A vehicle was “taking coolant”. Gauge always reads lower than normal. Boils over during highway driving. Customer wants vehicle winterized. Electric fan won’t stop running.

Lets try a few examples of complaints that you will see.What would you do if:


Review QuestionsReview Questions

1. Why would coolant read 1 volt on a DVOM? 2. Why does a radiator hose show 12 volts on a DVOM 3. Where on an engine is an oil pressure test performed? 4. What would cause low oil pressure? 5. What would cause excessive oil pressure? 6. What is “viscosity”? 7. What could be the problem if a cam seal continues to leak

externally after several replacements and the shaft is not scorn?


The EndThe End

Cooling & Lubrication Chapter Review November 7, 2000By Laval Paradis - NSCC Cooling & Lubrication...

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