Engine Repair 2

After replacing a swollen lower radiator hose, the engine continues to overheat. Which of the following is MOST likely causing this condition?

• A faulty water pump

• A bad headgasket

• A faulty lower replacement hose

• Air in the system

RTV (Room Temperature Vulcanizing) aerobic sealant:

• cures in the ABSENCE of air

• Is safe for oxygen sensors

• is used primarily inside the engine

• cures in the PRESENCE of air

A high mileage engine has a knocking sound that goes away as it warms and reaches operating temperature. Which of these is MOST likely causing this noise?

• Loose crankshaft main bolts

• Loose flywheel bolts

• Piston to cylinder wall clearance

• A loose timing belt

Technician A says preignition occurs when a flame front ignites in the combustion chamber before the spark plug fires. Technician B says installing the wrong spark plug in an engine can result in detonation. Who is correct?

• Tech A

• Tech B

• Both

• Neither

A turbocharged engine emits blue-gray exhaust. Which of the following would result in this condition?

• leaking fuel injector

• faulty turbo oil seals

• blown head gasket

• faulty turbo wastegate

There is a loud squeal at the front of a supercharged V6 engine that gets louder as the engine is accelerated. Which of the following is causing this noise?

• chipped compressor wheel

• damaged turbine shaft

• turbine shaft needle bearings

• front roller bearings

A vehicle's engine is slow cranking. Which of the following should the technician check first?

• starter

• alternator

• battery

• ignition switch

A vehicle with a new fully charged battery continues to discharge overnight. A battery state of charge test indicates 9.2 volts the next morning. Which test is used to diagnose this condition?

• parasitic drain test

• alternator full-field test

• specific gravity test

• voltage drop test

Technician A says to use a cylinder bore gauge to measure the cylinder's bore for excessive taper. Technician B says to measure the cylinder's bore for an out of round condition before installing new pistons. Who is correct?

• tech A

• Tech B

• Both

• Neither

When replacing connecting rod bearings in an engine

• replace the crankshaft if the connecting rod bearings are worn

• scratch the cylinder number on each connecting rod

• use oversized bearings

• do not mix up the connecting rod cap locations