Advanced Auto Tech. ASE A 1 Test Preparation Engine Upper End Theory & Service

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Malcolm Whitehead
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1 Advanced Auto Tech ASE A 1 Test Preparation Engine Upper End Theory & Service

2 Torque to yield bolts stretch to their yield point when tightened and should not be reused. True or False

3 The sealing lip & spring on an oil seal should face toward the fluid being sealed. True or False

4 Intake manifolds can be made of plastic or aluminum. True or False

5 Exhaust manifolds are typically steel or cast iron. True or False

6 Oil pumps should be primed with high temperature wheel bearing or chassis grease to prevent dry starts. True or False

7 Variable valve timing is done through hydraulic actuators on the cam sprockets & PCM controlled solenoids that switch oil flow. True or False

11 Lift of a camshaft lobe is determined by subtracting base diameter from the overall lobe height. True or False

OHC timing belts have a recommended replacement interval or service interval to prevent slippage or breakage which can bend valves. (freewheeling vs.

12 OHC timing belts have a recommended replacement interval or service interval to prevent slippage or breakage which can bend valves. (freewheeling vs. interference valve train) True or False The positive aspect of belts is that they are smooth and quiet and the disadvantage is they periodically need to be replaced. The mileage interval for replacing most belts is from 60, ,000 miles.

13 Some water pumps on OHC engines are driven by the timing belt. True or False

14 Valve Seats, valve guides, & valves themselves can all be serviced by complete replacement. True or False

15 An interference engine will collide the valves with the piston if the timing belt slips. True or False

16 Interference fit of valves indicates a ½ º to 1 ½ º difference between face & seat angles. (usually 1º) True or False 46 45

17 If a warped head is milled or a warped block is decked, compression ratio will increase. True or False

18 Which precision measuring tools are used in combination to check cylinder head flatness or warp?

19 After grinding valve faces & seats, valve spring installed height: A. Increases B. Decreases C. Stays the Same

20 After grinding valve faces & seats, valve stem height: A. Increases B. Decreases C. Stays the Same

21 After adding valve spring shims, valve spring installed height: A. Increases B. Decreases C. Stays the Same

22 After adding valve spring shims, valve spring free length: A. Increases B. Decreases C. Stays the Same

500 50 = What is the compression ratio of an engine with a 500 cc cylinder & a

23 What is the compression ratio of an engine with a 500 cc cylinder & a 50 cc combustion chamber? = What is the compression ratio of an engine with a 500 cc cylinder & a 40 cc combustion chamber? = What is the compression ratio of an engine with a 500 cc cylinder & a 52.5 cc combustion chamber? =

24 For a 46º valve seat, a typical topping angle would be: A. 30º or 31º B. 60º C. 15º

25 What must be done to remove a valve with a mushroomed tip from a cylinder head?

26 Name 3 methods for crankshafts to drive camshafts:

27 Name the parts of the valve A. C. A = Valve Margin C = Valve Face B. B = Valve Stem

28 Name the valve train parts: A = Valve Keepers B = Valve Spring Retainer A. B. C = Valve Seal D = Valve Guide C. D.

29 Measure a valve guide & a valve stem, then determine clearance Valve Guide Valve Stem Valve Guide Valve Stem

30 Measure a valve guide & valve stem, then determine clearance mm Valve Guide Valve Stem

31 Closer together coils of a valve spring designed to prevent float, flutter, and bounce of the valve as it slams shut into the seat A. Thin Wall Liners B. Spring Shims C. Dampening Coils D. Lifter Shims

32 Repair for a worn valve guide consisting of a thin bronze bushing that gets press fit into a reamed out guide restoring original I.D. A. Thin Wall Liner B. Spring Shims C. Dampening Coils D. Lifter Shims

33 Style of valve lifter that is supplied with pressurized oil in an effort to maintain zero lash & provide quiet operation A. Roller Lifter B. Valve Rotator C. Mechanical Bucket Lifter D. Hydraulic Lifter

34 Crack detection method commonly used on non ferrous materials A. Dye Penetrant B. Magnafluxing C. Plastigauge D. X Ray Inspection

35 OEM method of cancelling fuel & compression on cylinders when not needed in an effort gain fuel economy A. Displacement on Demand B. Roller Hydraulic Lifter C. Hydraulic Bucket Lifter D. Valve Rotator

36 Exhaust valve train component that prolongs seat & face life by wiping them clean through rotation of the valve A. Valve Rotator B. Oil Squirter C. Dampening Coils D. Lifter Shims

37 Name for the distance between the valve stem tip and the component that moves it rocker arm, follower, tappet, lifter, etc. A. Valve Clearance B. Valve Train Play C. Valve Lash D. A & C

38 Parts that are used to adjust valve spring installed height after cutting seats & faces A. Bucket Lifter Shims B. Valve Spring Shims C. Valve Rotators D. Valve Tip Caps

39 Devices to provide a pressurized stream of lubrication to critical friction areas A. Oil Squirter B. Valve Rotator C. Roller Lifter D. Chain Guide

40 Style of valve lifter using a wheel against the camshaft lobe in an effort to reduce valve train friction A. Oil Squirter B. Valve Rotator C. Roller Lifter D. Chain Guide

41 A nylon coated rail in which timing chains ride, preventing chain slack & chain deflection as well as quieting chain operation A. Oil Squirter B. Valve Rotator C. Roller Lifter D. Chain Guide

42 A replaceable part of very accurate thickness used to adjust valve lash on a valve train equipped with mechanical bucket lifters A. Lifter Shim B. Valve Spring Shim C. Valve Stem Cap D. Ball Pivot & Nut

45 Valve Guide Measures 0.312

47 Valve Stem Measures 0.310

51 Valve Guide Measures 6.00 to 6.01 mm

53 6.00 mm 5.96 mm 0.04 mm Valve Stem Measures 5.95 to 5.96 mm

Modern Auto Tech Study Guide Chapters 13 & 14 Pages Engine Construction 52 Points

Modern Auto Tech Study Guide Chapters 13 & 14 Pages 182-216 Engine Construction 52 Points Automotive Service 1. The engine top end includes the cylinder, valve cover and intake & exhaust. Head, Manifolds