Engine Repair U1-U4

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

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

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

The diagnosis of an engine knock requires a road test. The technician should include on the work order the mileage out and the mileage in to show that the:

• Vehicle was road tested.

• Vehicle was not driven over the speed limit.

• Engine was warmed up.

• Vehicle has the correct fuel.

A V-6 engine is overheating and has heavy white smoke from the tail pipe. Which of these could be the cause?

• A stuck open thermostat

• An overfilled engine oil level

• A leaking cylinder head gasket

• A stuck-open fuel injector

The Acronym TDC means...

• Telephone Direct Call
• Tread Design Correction
• Top Dead Center
• Timing Done Correctly