2-38. Which of the following defects does  NOT  warrant  valve  spring replacement? 1. Loss of 2 percent of length 2. Damage to protective coating 3. Hairline  cracks 4. Rust  pits 2-39. Which of the following results will occur if shims are not properly  placed  between  a  valve stem and valve stem cap? 1. Damaged valve stem cap 2. Damaged or broken valve stem 3. Dropped  valve 4. Each of the above 2-40. What is the most important factor in  keeping  a  properly  adjusted valve  actuating  gear  in  good condition? 1. Minimum   clearance 2. Control  of  corrosion 3. Proper  materials 4. Adequate   lubrication 2-41. If the threads on a rocker arm adjusting  screw  become  worn,  what must you do? 1. Replace the rocker arm, screw, and  locknut 2. Replace the screw only 3. Replace the screw and locknut only 4. Dress the threads on the screw 2-42. To adjust the tappet to the intake valve of a 4-stroke cycle engine, the piston must be in what position? 1. On  the  intake  stroke 2. On  the  compression  stroke 3. Between  the  compression  and power  strokes 4. Between the intake and compression   strokes 2-43. What  is  the  most  frequent maintenance  requirement  for  rocker arms? 1. Reaming  the  bushings  in  the rocker  arms 2. Inspecting  the  rocker  arm  ends for wear 3. Checking  tappet  clearances  and locknut  tightness 4. Replacing  tappet  adjusting screws  and  locknuts 2-44. After  setting  a  tappet  clearance and  locking  the  adjusting  screw with the locknut, what is your next  step? 1. Recheck  the  clearance 2. Adjust  the  next  tappet 3. Warm the engine up and reset the  clearance 4. Check  the  manufacturer's manual to see if the clearance is  correct 2-45. When a lash adjuster is adequately supplied with oil, what will most likely cause it to operate noisily? 1. Excessive   clearance 2. Broken  parts 3. Dirt,resin,  or  abrasive particles 4. Missing  check  ball  or  spring 2-46. Which  of  the  following  actions should you take to insert a camshaft  into  the  camshaft  recess? 1. Rotate it as you push it in 2. Shake it up and down 3. Apply grease to it 4. Hit it with a sledge 2-47. Why is it necessary to scrape around the top of a cylinder bore before  pulling  the  piston? 1. To remove any metal ridges and carbon  deposits 2. To  increase  clearance  for  the piston 3. To  remove  abrasive  particles and  gum 4. To free the piston rings 13