Engine Repair 1

An engines connecting rod bearing are worn , resulting in low oil pressure and a knocking noise. Technician Which of the following could be the cause?

• Low contaminated oil

• Clogged crankshaft oil galleries

• Clogged air filter

• Both A and B

The technician in the picture is:

• Setting torque with a torque wrench

• Setting angle with a torque angle gauge

• Adjusting the rocker shaft

• None of the above

A vehicle has black colored exhaust and a lack of power when accelerating. Technician A says a rich air-fuel ratio may have clogged the catalytic converter. Technician B says to use a back pressure tester to test for a restriction in the exhaust system. Who is correct?

• Technician A

• Technician B

• Both Technician A and B

• Neither Technician A nor B

A turbocharged engine is misfiring, and the check engine light is on. A scan tool indicated code P0234 ( an overboost condition). Which of the following could be the cause?

• A stuck open wastegate

• An intake manifold leak

• A stuck closed wastegate

• Leaking turbocharger seals

Technician A says worn valve guides result in excessive oil consumption. Technician B says aluminum heads have valve guide inserts. Who is correct?

• Technician A

• Technician B

• Both A and B

• Neither A nor B

An engine is leaking oil past several oil seals. Technician A says a stuck closed PCV valve would cause these leaks. Technician B says a clogged crankcase breather tube would result in this condition. Who is correct?

• Technician A

• Technician B

• Both A and B

• Neither A nor B

Technician A says a rich air-fuel mixture can cause excessive carbon build up on the engine's valves and pistons. Technician B says coolant entering the combustion chamber from a faulty head gasket produces excessive carbon build up on the piston crown. Who is correct?

• Technician A

• Technician B

• Both A and B

• Neither A nor B

The skirt on one of an engine's pistons has excessive wear. Which of the following could be the cause?

• Worn piston rings

• A clogged PCV valve

• A bent connecting rod

• Worn crankshaft bearings

Technician A says Variable Valve Timing (VVT) controls valve timing independent of crankshaft rotation. Technician B says contaminated oil will affect the operation of a VVT engine. Who is correct

• Technician A

• Technician B

• Both A and B

• Neither A nor B

A vehicle's engine is slow cranking. What should be checked first?

• The Starter

• The Alternator

• The Battery

• The ignition switch