Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 9, Problem 6ASRQ
A vehicle is producing a sharp, metallic rapping sound originating in the upper portion of the engine. It is most noticeable during idle. Technician A diagnoses the problem as piston pin knock Technician B says that the problem is most likely a loose crankshaft thrust bearing. Who is correct?
- Technician A
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vehicle is producing a sharp, metallic rappingsound originating in the upper portion of the engine.It is most noticeable during idle. Technician A diagnosesthe problem as piston pin knock. Technician Bsays that the problem is most likely a loose crankshaftthrust bearing. Who is correct?a. Technician Ab. Technician Bc. Both A and Bd. Neither A nor B
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Chapter 9 Solutions
Automotive Technology
Ch. 9 - Prob. 1SACh. 9 - Describe what takes place during the four strokes...Ch. 9 - As an engines compression ratio increases, what...Ch. 9 - What test can be performed to check the efficiency...Ch. 9 - Describe five ways in which an engine can be...Ch. 9 - Prob. 6SACh. 9 - True or False? In an HCCI engine, combustion...Ch. 9 - True or False? SAE mandates that engine, when...Ch. 9 - True or False? The camshaft is always located in...Ch. 9 - Which of the following statements about engines is...
Ch. 9 - Which stroke in the four-stroke cycle begins as...Ch. 9 - Which of the following is not a true statement...Ch. 9 - Technician A says head gasket thickness has an...Ch. 9 - The stroke of an engine is the crank throw half...Ch. 9 - Which of the following is an expression of how...Ch. 9 - While diagnosing the cause for blue smoke from the...Ch. 9 - Prob. 2ASRQCh. 9 - While determining the cause for air leaking out of...Ch. 9 - While diagnosing the cause for an engine having...Ch. 9 - While looking at the results of an oil pressure...Ch. 9 - A vehicle is producing a sharp, metallic rapping...Ch. 9 - While conducting an engine vacuum test; Technician...Ch. 9 - While determining the most likely problem of an...Ch. 9 - When a customer states that black exhaust smoke is...Ch. 9 - Technician A says that if an engine had good...
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- While diagnosing the cause for an engine having good results from a compression test and cylinder leakage test but poor results from a cylinder power balance test: Technician A says that incorrect valve timing is the most likely cause. Technician B says that a severely worn cam lobe is a likely cause. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forwardTechnician A says that crankshaft counterweights offset the weight of the connecting rods and pistons. Technician B says that crankshaft counterweights are used to dampen crankshaft torsional vibrations. Who is correct? Technician A Technician B Both A and B d. Neither A nor Barrow_forwardWhile discussing the results of an oil pressure test: Technician A says that when the fluid pressures are high, internal leaks, a clogged filter, low oil pump out put, or a faulty pressure regulator valve are indicated. Technician B says that if the fluid pressure increased at the wrong time, an internal leak at the servo or clutch seal is indicated. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forward
- While installing a timing belt: Technician A installs the belt, turns the crankshaft two full rotations, then applies tension to the belt. Technician B installs the belt, applies tension, then turns the crankshaft two full rotations. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forwardTechnician A says that delayed shifting can be caused by worn planetary gearset members. Technician B says that delayed shifts or slippage may be caused by leaking hydraulic circuits or sticking spool valves in the valve body. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forwardTechnician A says that if a drive belt does not have the proper tension, it may produce squealing and chirping noises. Technician B says belt tension should be checked even if the engine has an automatic belt tensioner. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forward
- While determining the cause for air leaking out of the oil throttle body during a cylinder leakage test: Technician A says that a burnt intake valve is indicated. Technician B says that a warped cylinder head or bad head gasket is indicated. Who is correct? Technician A Technician B Both A and B d. Neither A nor Barrow_forwardDuring a test drive, a noise that appears to be transmission related disappears when the driver brings the vehicle to a stop and disengages the clutch with the engine at idle. Technician A says that the noise may be caused by an internal transmission problem. Technician B says that the problem may be something interfering with the flywheel or pressure plate. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forwardCarbon deposits on the intake valve or seat may cause the valve not to close properly. Tech a says that the flywheel will be harder to spin when starting the engine. Tech b says that the engine will loose power. Who is correct?arrow_forward
- A discussion concerning CV joint testing is being held. Technician A says that a recommended method to check CV joints is to raise the vehícle so that the lower control arms are hanging freely; at this point the engine can be accelerated while noise checks can be performed. Technician B says that the vehicle should be road tested so that the CV joints can be checked under load. Who is correct? O a. A only O b. B only c. Both A and B d. Neither A nor Barrow_forwardWhile discussing valve body assemblies in late-model transmissions: Technician A says that the valve body is no longer needed in some electronically controlled transmissions. Technician B says that an EPC solenoid maintains constant fluid pressure through the valve body regardless of the vehicle’s operating condition. Who is correct?arrow_forwardTechnician A says that the transmission rear seal at the driveline is particularly prone to leakage. When Technician B pushes up and down on the transmission, he says that the mounts require replacement because the case moves up and down. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forward
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