ASE A1 Engine Repair Practice Test
71. To repair a small crack in a cast-iron engine block using the metal pinning method use all of the following tools EXCEPT:
- A. A drill bit.
- B. A tap.
- C. A grinder.
- D. A welding rod.
Answer A is wrong. Both cylinder heads and engine blocks can be pinned or stitched without welding. Drill the holes using a bit that matches the bolts. These cracks usually reach into a coolant or oil jacket. Be sure to drill deep enough to repair the leak.
Answer B is wrong. Pinning kits usually have the proper tap. If not, use a tap from your set; ream a ridge around the hole before inserting the bolt.
Answer C is wrong. Apply the thread lock or sealer provided in the kit and torque the bolt. Grind the bolt down close to the surface, and then peen the bolt again with a punch and hammer. Smooth the bolt even with the surface.
Answer D is correct. Metal pinning is an acceptable method for repairing a cracked cylinder head or an engine block. Welding an engine block can be difficult due to high temperatures and special procedures implemented by professional welders.
72. Which of the following results in low oil pressure?
- A. A stuck closed oil pressure relief valve.
- B. Worn crankshaft bearings.
- C. A restriction in the oil filter.
- D. A clogged oil pressure relief valve.
Answer A is wrong. The oil pressure relief valve opens to release oil pressure. An stuck closed oil pressure valve results in high oil pressure.
Answer B is correct. Worn crankshaft, camshaft, and rod bearings cause low oil pressure. There are different specifications and tolerances according to the application. It is usually no more than .001 inch off the diameter of the bearing.
Answer C is wrong. A restriction in the oil filter or a stuck closed or clogged oil pressure valve results in high oil pressure.
Answer D is wrong. High oil pressure results in oil leaking past oil seals and oil leaks in other areas of the engine.
73. To inspect an aluminum cylinder head for cracks and warpage, the technician should perform all of the following tasks EXCEPT:
- A. Remove old gasket material with a gasket softener and a plastic scraper.
- B. Clean with an appropriate degreaser and a small brush.
- C. Use magnetic particle inspection to detect cracks.
- D. Use a feeler gauge and a straight edge to check for warpage.
Answer A is wrong. Remove old gasket material with spray-on gasket softener and a plastic scraper.
Answer B is wrong. Clean cast iron heads in a hot tank with a caustic solution. Aluminum heads are more delicate and are best cleaned with an appropriate degreaser and a small brush.
Answer C is correct. Magnetic particle inspection or Magnafluxing® is the process used with ferrous or iron cylinder heads. Use a special dye and developer to reveal cracks in aluminum cylinder heads.
Answer D is wrong. Use a feeler gauge and a straight edge to check for warpage.
74. The technician in the illustration is checking:
- A. Valve spring installed height.
- B. Valve spring free length.
- C. Valve spring squareness.
- D. Valve spring tension.
Answer A is wrong. Valve spring installed height is measured from the bottom outer edge of the valve spring retainer to the pocket in the cylinder head. It's the height of the spring with the valve closed.
Answer B is correct. Check valve spring free length with a caliper, as shown in the illustration.
Answer C is wrong. When placed on a flat surface, the springs should remain square. Replace short springs (~1/16 inch).
Answer D is wrong. Check valve spring tension with a valve spring pressure tester.
75. Technician A says when replacing a cylinder head to reuse the torque to yield bolts as long as they are cleaned and oiled before they are reinstalled and torqued. Technician B says after removal, a torque to yield bolt always returns to its original length. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is wrong. With a standard bolt, a technician could torque the bolt to its yield point, and it would return to its original form and length when removed. It has elasticity; it can stretch and then return to its original form.
Answer B is wrong. Cleaning a bolt that has stretched does not restore it to its original length.
Answer C is wrong. This answer could be correct if the TTY bolt passes all of the manufacturer's required specifications. Be careful when clamping cylinder heads with these bolts.
Answer D is correct. Neither technician is correct. Due to the nature of their design, torque to yield bolts or stretch bolts should not always be reused.