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Air-Cooled Engine Technology
Air-Cooled Engine Technology
Test #1 Review
≈ 80 Questions
Covers Chapters 1, 2, 4, 5, 22
Careers & Professionalism
Tools & Safety
Engine Basic Theory &Operation
2 Stroke & 4 Stroke Cycle
Air-Cooled Engine Technology
Test #1 Question Format
True & False
Matching of Definitions - Vocabulary
Short Answer
Measuring & Math
Engine Parts Identification
Tools to Know & What Their Use Is
Armature Air Gap Gauge
Spark Tester Too Much Gap = No Spark
Checks for 12, 000 Volts
Vibration Tachometer
Cylinder Leakage Tester
Tools to Know & What Their Use Is
RPM & Blade Tip Speed
Is Important for Operation Pinpoints Cylinder Leaks
Compression Testers Also Called Compression Gauges
Tools to Know & What Their Use Is
Measures Cylinder Cranking Pressure
Compression Needed For Heat
Torque Wrenches
Tiny Tach
Tools to Know & What Their Use Is
Proper Tightening of Fasteners Accurate RPM Readings
Digital Multimeter
Telescoping Gauge Small Hole Gauge
Tools to Know & What Their Use Is
V, O, A, Temp, RPM
Inside Diameter Measurements
Flat Feeler Gauges
Thread Pitch Gauges
Tools to Know & What Their Use Is
Clearance Measurements
ID Coarse or Fine Threads
Wire Feeler Gauges
Tools to Know & What Their Use Is
For Gapping Spark Plugs
Dial Caliper
Micrometer
Tools to Know & What Their Use Is
Inside, Outside, Depth
Extremely Accurate O.D.
From Chapter 1 Study Guide
2. No unnecessary risks
6. Never gas-up a hot or running engine!
11. Safety Glasses!
13. Carbon Monoxide Poisoning = Asphyxiation
From Chapter 2 Study Guide
16. Dial Calipers
19. Feeler Gauges
23. Dial Indicators
From Chapter 4 Study Guide
1. Energy Change from Chemical to Heat to
Mechanical in an engine
2. Internal Combustion is “burning inside”
From Chapter 4 Study Guide
3. Carburetors & Injectors Atomize Fuel
4. Combustion Chamber is above the piston
and under the cylinder head
From Chapter 4 Study Guide
18. Aluminum is a lightweight metal used to
cast blocks and cylinder heads
22. Crankshaft-journals
26. Flywheel
27. Piston
28. Piston Rings
From Chapter 4 Study Guide
30. Wrist Pin vs. Crank Pin
31. Connecting Rod
32. Motions
From Chapter 4 Study Guide
32. Motions
33. Poppet Valves
36. Camshaft
From Chapter 4 Study Guide
37. Valve Tappets = Valve Lifters
38. Camshaft # of teeth vs. crankshaft
39. Camshaft speed relationship to crankshaft
40. Flywheels’ many jobs!!
From Chapter 5 Study Guide
1. Stroke is one piston movement
2. Stroke is a distance measurement
Bore x Bore x Stroke x .785 = Displacement
Displacement is Total Cylinder Volume
From Chapter 5 Study Guide
3. Name the 4 strokes of the 4 stroke cycle!!
6, 8, 9. Know the crankshaft & camshaft
degrees of rotation during operation
Crankshaft
½ Turn
180º
Camshaft
¼ Turn
90º
From Chapter 5 Study Guide
7. Know the 4 stoke cycle inside & out!!
Air-Cooled Engine Technology
Overhead Valve or I - Head Engine Shown
Air-Cooled Engine Technology
L - Head or Side Valve Engine Shown
From Chapter 5 Study Guide
11. Reason for Compression
13. Compression Ratio
From Chapter 5 Study Guide
14. Scavenging
18. Valve Timing & Valve Overlap
From Chapter 5 Study Guide
25. Back Pressure from Sound Waves
From Chapter 5 Study Guide
26. Reed Valve vs. Piston Port “valving”
28 & 29. Two-cycle vs. Four-cycle
From Chapter 22 Study Guide
3. Manuals are hard copy or electronic
13. What is the EETC
14. Competent people doing Quality work
From Chapter 12 Study Guide
1. Why encourage Preventive Maintenance
16. Troubleshooting – complaint, cause, correction
Fire
Triangle
Air
Fuel Heat
1) Compression
2) Spark
Be Able to Explain This Concept:
Related to No-Start
Related to Hard-Starting
Related to Rough Running
• Cylinder: Precisely Machined Hole for
Piston
• Crankshaft: Main Shaft – Changes
Reciprocating Motion to
Rotary Motion
• Piston: Slides Up & Down in the Cylinder
• Camshaft: Operates the Poppet Valves
• Poppet Valves: Open & Close the Intake &
Exhaust Ports
• Lifters or Tappets or Cam Followers:
Between Valve Stems & Cam
• Bore: Cylinder Diameter
• Stroke: Length of Piston Travel
Distance from TDC to BDC
One Piston Movement Up or Down
• Displacement: Total Cylinder Volume
• TDC: Top Dead Center
• BDC: Bottom Dead Center
• Combustion Chamber:
Space Where Fuel & Air Burns
Located Above the Piston & Below the Cylinder Head
• Atomization:
Breaking Fuel into Small Particles & Mixing it with Air
• Vaporization: Fuel & Air in a “Cloud” Form
Poppet Valve Parts
Engine Manufacturers (OEM’s)
Implement & Power Equipment
Manufacturers (OEM’s)