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 Cover, Manifolds Bore, Manifolds
2. Cylinder heads are made of either cast or cast. Iron, Aluminum Iron, Plastic Iron, Bronze
3. Poppet valves are opened by the camshaft and pulled shut by the valve. http://www.niv.co.jp/gif/valve.gif Lobes, Springs Journals, Actuators Lifts, Oilers
4. Valve prevent oil from being drawn into the combustion chamber through the valve. Seals, Guides Seals, Stems Seals, Manifolds
5. A valve turns the valve to prevent carbon buildup & hot spots on the valve face. Eraser Rotator Sweet Potater
6. Cam are precision-machined, polished surfaces on the camshaft against which tappets, lifters, or cam followers ride. Lift and duration of the valve opening are controlled by lobe configuration. Rockers Lobes Actuators
Lift Automotive Service
7. Valve is the time when both the intake and exhaust valve are open at the same time. Under Bite Overlap Early Rise
8. valve lifters are desirable because of their quiet operation & zero clearance (lash). Pneumatic Hydraulic Vacuum
9. Over Head Valve engines (OHV) are equipped with rods and arms. Push, Rocker Push, Slacker Pull, Rocker
http://www.ccds.charlotte.nc.us/mcgrail/stu0102/hp10/images/engine-cam.gif
10. Over Head engines (OHC) do not use push rods, and may or may not use rocker arms. Camshaft Crankshaft Balance Shaft
11. The two manifolds on the engine are the and the manifolds Intake Exhaust
ASE-Type Questions [page 198] Circle your choice for the correct answer 1. A B C D top end 5. A B C D valve flutter 7. A B C D cam drives 9. A B C D cam end play
~~~ Automotive Service 12.The engine bottom end includes the, crankshaft, rods & pistons. Block, Connecting Block, Push Head, Connecting
13. Blocks may be cast of either or. or liners are used in aluminum blocks for durability. Heavy duty trucks with iron blocks use sleeves to promote easy major overhauls. Iron, Aluminum, Sleeves
14. sleeves are not in contact with engine coolant but sleeves or liners do contact the coolant. Dry, Wet Long, Short Internal, External
15. High performance engines may have - bolt main bearing caps or be cross-bolted for extra strength with up to 6 bolts per main bearing cap! Four
16. The very top of the piston is the. The side of the piston is known as the. Head of the Piston a.k.a. Piston Crown Skirt of the Piston
17. - pistons are machined slightly oval shaped to compensate for thermal expansion. These pistons are oval shaped when cold and expand to take on a round shape when hot. Cam-Ground In-Ground Above-Ground
18. The valves come so close to touching the piston head when they open that small indentations called are machined or cast into the piston crown to provide piston-to-valve clearance. Fast Reliefs Valve Reliefs Ring Grooves
19. Engines usually have 2 piston rings and 1 - control piston ring. Compression, Oil Scraper, Oil Combustion, Oil
20. Cast iron piston rings may need an outer coating of or moly to increase wear resistance. Plastic Chrome Silver
21. The or wrist pin fastens the piston to the connecting rod. Cotter Pin Piston Pin King Pin
22. A notch, an arrow, or a dot on the top of the piston faces toward the of the engine. This indicates that an offset wrist pin is being used to reduce piston slap. Front Back Side
23. Connecting rods and their caps should not be mismatched, therefore they are often. Numbered or Marked 3 3
24. A is a general name describing a smooth bearing surface on a shaft. Journal Log Throw
25. There are passages drilled through crankshafts for pressurized to reach the main & rod bearings. Air Oil Coolant
26. Bearing babbit has a characteristic known as allowing the bearing to embed dirt & metal particles contained in the oil that would otherwise scratch and ruin the crankshaft journal surfaces. Embedability Reliability Miscibility
27. A main thrust bearing is used to control or limit crankshaft. Thrust bearings have flanged sides. Thrust Angle End Play Runout
28. The bearing oil seal prevents oil leakage around the back of the crankshaft. Rear Main Front Main Side Main
Leaky Front Main Seal Automotive Service
29. Rear main oil seals, made of, can be either 1-piece or two-pieces. J-B Weld Foam Rubber Neoprene
30. shafts, a.k.a. silencer shafts, are used in some engines to help cancel vibrating forces. Balance Valance Tolerance
ASE-Type Questions [pages 215 & 216] Circle your choice for the correct answer 3. A B C D piston skirts 6. A B C D oil control rings 7. A B C D ring measurement 8. A B C D con rod drillings 9. A B C D con rod journals 10. A B C D bearings