Cooling & LubricationCooling & Lubrication

Chapter Review

MARCH-2004

Cooling & LubricationCooling & Lubrication

Chapter reviewImage viewingInteractive questionsClosing

MARCH-2004

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”

MARCH-2004

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

MARCH-2004

Cooling SystemsCooling Systems

1. What are 2 types of cooling systems?

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

1. Air - Liquid

MARCH-2004

Cooling SystemsCooling Systems

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

MARCH-2004

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

MARCH-2004

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

MARCH-2004

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

MARCH-2004

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

MARCH-2004

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

MARCH-2004

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”.

MARCH-2004

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

MARCH-2004

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.

MARCH-2004

Service & RepairService & Repair

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

maintenance Adjustments Electrolysis

Common Failures

MARCH-2004

Diagnostic AidsDiagnostic Aids

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

MARCH-2004

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:

MARCH-2004

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?

MARCH-2004

The EndThe End