Cooling

1
Cooling Lubrication

• Chapter Review

2
Cooling Lubrication

• Chapter review
• Image viewing
• Interactive questions
• Closing

3
Oil 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 Pump
2. Gear
3. .005
4
Oil 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
5
Cooling Systems

• 1. What are 2 types of cooling systems?
• 2. What are the 9 items listed in the diagram?

1. Air - Liquid
6
Cooling Systems

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

7
Coolant

• 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. 67/33
2. 212º F
3. 235º
8
Radiator 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
9
Radiator Caps

• 1. How many types of radiator caps are there?
• 2. What is the average pressure rating of todays
  caps?
• 3. How do we test radiator caps?

1. 3 constant/vent/closed
2. 14-17 PSI
3. Visual/Pressure test
10
Radiator 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
11
Hose 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
12
Thermostats

• 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 Flow
2. 3ºF above or below rating
3. 20ºF above start to open.
13
Fans 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
14
Electric 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.
15
Service Repair
Common Failures

• Oil pressure sending units
• External leaks
• Corrosion
• Belts
• Component failure
• Fluid breakdown lack of maintenance
• Adjustments
• Electrolysis

16
Diagnostic Aids

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

17
Scenarios
Lets try a few examples of complaints that you
will see. What would you do if

• 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 wont stop running.

18
Review 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?

19
The End