Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 12, Problem 3MC
To ensure proper seating of the valve, the valve seat must be.
- the correct width
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during what stroke one valve is closed and the piston is moving downward in the cylinder
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Chapter 12 Solutions
Automotive Technology
Ch. 12 - Explain staged and continuously variable value...Ch. 12 - Prob. 2SACh. 12 - Define valve margin.Ch. 12 - What usually causes warpage in an aluminum cylin...Ch. 12 - What are the two ways pushrods can be checked for...Ch. 12 - True False? Fiats MultiAir system relies on...Ch. 12 - True False? Camshaft straightness is checked using...Ch. 12 - Which of the following is not true of knurling? It...Ch. 12 - To allow the engine to run on the Atkinson cycle,...Ch. 12 - To ensure proper seating of the valve, the valve...
Ch. 12 - Many engines with WT have a phaser mounted to the...Ch. 12 - Multiple valve engines tend to be more efficient...Ch. 12 - Which of the following is not a type of valve...Ch. 12 - What type of valve lifter automatically...Ch. 12 - Prob. 8MCCh. 12 - While discussing the reasons for resurfacing a...Ch. 12 - While inspecting the timing gears of an engine:...Ch. 12 - Technician A says that positive valve stem seals...Ch. 12 - Prob. 4ASRQCh. 12 - Technician A says an engine may use one or more...Ch. 12 - Technician A says it is not necessary to measure...Ch. 12 - While discussing the Valvetronic system:...Ch. 12 - While checking a hydraulic phaser after the...Ch. 12 - While servicing a pair of aluminum cylinder heads:...Ch. 12 - While discussing camshafts Technician A says valve...
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- Which of the following statements is not true? Normally the desired valve face-to-seat contact area for intake valves is 1 inch. Normally the desired valve face-to-seat contact area for exhaust valves is 1 inch. The average valve seat width is 0.060 inch and the average seat begins 0.030 inch from the valve margin. A properly reconditioned seat has the correct seat width and sealing position on the valve face.arrow_forwardWhat should you do if a valve does not move freely in its bore in the valve body?arrow_forwardWhen fitting a freshly ground valve into a freshly ground seat: Technician A says that the seat should be ground more with the same stone if the margin is too small. Technician B says that the seat should be ground more with the same stone if the valve seat is too high. Who is correct?arrow_forward
- What device in the valve train changes rotary motion into reciprocating motion? a. Eccentric Cam Bushing Mandrelarrow_forwardHow to operate single acting cylinder by using 3/2 direction control valve? EXTEND RETRACT M Pump (b) Piston 2 Filter Oil Tank (a) Piston 1arrow_forwardWhich of the following is not true of knurling? It is one of the fastest techniques for restoring the ID dimensions of a worn valve guide. It reduces the amount of work necessary to reseat the valve. It is useful for restoring badly worn guides to their original condition. None of the above.arrow_forward
- Technician A says that positive valve stem seals fit tightly around the top of the valve guide. Technician B says that positive stem seals scrape oil off the valve as it moves up and down. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forwardWhat is the rotational travel through which both valves are closed? (in degrees)arrow_forwardWhat angle is the pipe at in the 6G position?arrow_forward
- Valves are favored because of their lower cost and lighter weight Correct answer plug ball poppet butterflyarrow_forwardHow many degrees of crankshaft travel until the exhaust valve opens after the intake valve closes? (in degrees)arrow_forwardWhich of the following ensures proper timing of the intake and exhaust valve events? The length of the tappets relative to the pushrods. Proper pairing of the gear set joining the crankshaft to the camshaft. The pulse timer mounted in series with the piston. The installation of the flywheel key.arrow_forward
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