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AirCooled Engine Technology
Roth 9 th Ch 12 Tuneup Pages 207 222
AirCooled Engine Technology 1. Tasks that must be performed at regular intervals to keep an engine
working properly are known as _______________ _____________, because they help prevent premature engine wear and breakdowns.
Preventive Maintenance Regular Cleaning Yearly CheckUp
AirCooled Engine Technology 2. Cleaning the ___________ _________ can prevent engine overheating.
This can be air or water spray.
Oil Filter Cooling Fins Carburetor
AirCooled Engine Technology 3. The crankcase _____ level should be checked every time that fuel is added.
Detergent Grime Oil
AirCooled Engine Technology 4. Engine oil should be _________ after the 1 st few hours of running, and then
changed regularly every 25 to 50 hours after that.
Changed Checked Strained
AirCooled Engine Technology 5. Oil becomes ___________ with contaminants and abrasives from blowby.
Saturated Loaded Programmed
AirCooled Engine Technology 6. Oil should be changed with the engine __________. This will assure that it
drains more completely and that contaminants suspended in the agitated oil will be drained out of the crankcase.
Warm Cold Running
AirCooled Engine Technology 7. 2stroke cycle oil should be mixed with the gas in the container and not in
the fuel tank. True or False
AirCooled Engine Technology 8. A tank kept full of fuel avoids problems from _______________ of moisture
in the tank.
Conduction Convection Condensation
AirCooled Engine Technology 9. Air _____________ designs are oilwetted, dry types, and dual element.
Service at least every 50 hours.
Bypass Turbo Filter
AirCooled Engine Technology 10. Oil leaks at multiple seals & gaskets may point to a crankcase _________
being restricted.
BREATHER The breather’s function is to maintain crankcase vacuum. It has a one way fiber disc valve, limiting the direction of air flow caused by the piston moving back and forth. It allows air to flow out of the crankcase, but blocks the return flow, maintaining a vacuum in the crankcase. A partial vacuum must be maintained in the crankcase to prevent oil from being forced out of engine at the piston rings, oil seals, and gaskets.
Respirator Breather Canister
AirCooled Engine Technology 11. Twostroke cycle engines are prone to exhaust port, ______________, and
spark arrestor screens becoming clogged with carbon and oil residue. This results in loss of power or possibly a nostart.
Clogging Blogging Flogging
AirCooled Engine Technology 12. Liquid cooling systems should be __________ at recommended intervals.
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Flashed Flushed Sampled
AirCooled Engine Technology 13. When storing an outboard, rinse the cooling system with fresh ________.
Baking Soda Vinegar Water
AirCooled Engine Technology 14. When servicing a selfcontained liquid cooling system with a radiator, an
_________________ and water mixture should be used. The coolant mixture is 50% ethylene glycol antifreeze & 50% water.
Antifreeze Antisqueeze Antisieze
AirCooled Engine Technology 15. Most engine service jobs can be done ________________ taking the whole
engine completely apart.
Before Without While
AirCooled Engine Technology 16. ______________ is a logical & systematic process of testing and checking
used to find problems. Reasoning and the process of elimination helps to locate and correct problems.
Bubble Blowing Troubleshooting Wild Guessing
AirCooled Engine Technology
Does the Machine Work?
Don’t Mess With It!
Did You Mess With It?
You Moron!
Does Anyone Know?
Hide It!
You Poor Slob
Will You Get Burned For It?
Trash It!
Can You Blame Someone Else?
No Problem!
AirCooled Engine Technology 17. The fundamental requirements for engine operation fall back on the basic
idea of the “Fire Triangle”. The 5 fundamental operating requirements mentioned in the chapter include:
1) proper CARBURETION 2) correct IGNITION system 3) adequate LUBRICATION 4) sufficient COOLING 5) proper COMPRESSION
Remember: Carburetion makes up 66% of the Fire Triangle
AirCooled Engine Technology 18. A ________________________ tachometer is also known as a sirometer.
Optical tachometers and inductive tachometers like the Tiny Tach ® are great for checking & adjusting engine speed.
Photo Vibration Digital
AirCooled Engine Technology
AirCooled Engine Technology 19. When troubleshooting engine mechanical condition, a _______________
test is often the first test performed.
Spark Compression Cylinder Leak
AirCooled Engine Technology 19. When troubleshooting engine nostart, a __________________ test is
often the first test performed.
Spark Compression Cylinder Leak
AirCooled Engine Technology 20. Doing a dry compression test followed by a _______ compression test
and comparing the readings can lead to decisions about the condition of mechanical parts like piston rings & valves.
Spark Wet Cylinder Leak
AirCooled Engine Technology 21. A differential pressure test, often called a cylinder _________ test, can
pinpoint the cause of low compression from leaks at the heads gasket, intake or exhaust valves, or piston rings.
Spark Compression Leakage
AirCooled Engine Technology 22. _____________ manuals and troubleshooting __________ are handy
sources of data to have available when servicing engines & implements. The wiring diagrams and exploded views in manuals make your diagnostic work go much smoother.
Service, charts Service, software Parts, charts
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AirCooled Engine Technology
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AirCooled Engine Technology 23. Engine _______________ and ______________ specifications are also
found in manuals & charts.
Tolerances , Clearance Torques, Specific Testing, Warranty
AirCooled Engine Technology 24. Always tighten fasteners to the proper _______________ specification.
AirCooled Engine Technology 25. In the case of multiple fasteners used on single parts, follow the proper
torque _________________ to limit distortion. If a torque sequence is not provided, use a crisscross or alternating pattern.
Values Sequences Tables
AirCooled Engine Technology
AirCooled Engine Technology
AirCooled Engine Technology
AirCooled Engine Technology