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AUTOMATIC TRANSMISSIONS
MICHIGAN MECHANIC STUDY GUIDE
QUESTIONS AND VERIFIED ANSWERS
A bad modulator would most likely cause: - ansa. Shifts that are too late and too harsh. (possible correct awnser) B. The transmission to slip or to get too hot. (not correct awnser) C. Shifts that are too soft. D. None of the above. A band in a transmission is glazed. What must you do to correct this condidtion? - ansa. Repalce the band B. Sand the outside of the direct drum, C. Replace the servo with one that uses a larger diameter apply piston. D. Both a and b. (correct awnser) A car has no drive in any range, forward or reverse. The fluid level is okay. What is the most likely cause? - ansa. Air leak in direct clutch B. Seized stator in the torque converter (not correct awnser) C. Very low oil pressure (correct awnser) D. Blown govenor seal or o-ring A car is very slugish pulling away from a stop and at low road speeds. At highway speeds the performance is better. You have checked and found
nothing wrong with the engine. What is the likely cause? - ansa. The torque converter is defective. (correct awnser) B. Main line pressure is too high. C. Govenor pressure is too low. D. The transmission filter is plugged. A car loses automatic transmission fluid. The customer says the car never leaks on the garage floor. What is the likely cause? - ansa. The vacuum modulator has an internal leak. (possible correct awnser) B. The control valve body has an internal leak. (not correct awnser) C. The torque converter has an internal leak. D. The cooler line fitting is leaking. A car upshifts early and wont go into passing gear at wide open throttle above 45 mph. What is the most likely cause of this problem? - ansa. Shift valves stuck in valve body (possible correct awnser) B. Improperly adjusted throttle linkage C. Servo accumulator assembly stuck (not correct awnser) D. Bad vacuum modulator A car upshifts late and harsh. There is no slippage and the closed throttle downshifts are okay. What should you do first? - ansa. Check the throttle linkage or modulator B. Changed the fluid and filter (possible correct awnser) C. Adjust the pressure regulator. D. Check clutch pack clearance. (not the awnser)
A vehicle wont downshift into first gear when coming to a stop. The most likely cause is: - ansa. A worn band B. A govenor stuck in the high speed position (correct awnser) C. A defective roller clutch D. A defective servo A vehicle wont downshift into passing gear. The likely cause could be: - ansa. The govenor valve is malfunctioning. B. A worn 2-3 shift rail. C. The throttle cable or linkage is out of adjustment. (correct awnser) D. None of the above. A worn govenor bore can cause : - ansa. Increased line pressure B. High modulator pressure C. Slipping when starting off in low gear (not correct awnser) D. Failure to shift out of low gear As engine vacuum drops, the modulator pressure: - ansa. Does not change B. Decreases C. Is compensatted for by the manual valve. (not the awnser) D. Increases Automatic transmission fluid that looks like a chocolate milkshake may indicate: - ansa. A leaking radiator cooler. (correct awnser) B. Too much automatic transmission fluid(overfilled). C. A sticking pressure relief valve. D. The fluid is aerated. (not the awnser)
Clutch pack clearance should be checked with: - ansa. A micrometer B. Air pressure C. A feeler gauge (correct awnser) D. A vernier gauge During a routine maintence service, you notice that the transmission fluid is a dark red color and the rear seal is leaking (the pan is clean). The vehicle and transmission have 65,000 miles on them with no shifting problems. What should you do next? - ansa. Remove the converter and flush it B. Remove the transmission since it will have to be overhauled C. Advise the customer that there is a problem and an internal inspection is neccessary. D. Change the fluid and filter and advise the customer that the rear seal and bushing should be replaced. (correct answer) Gear train end play can be adjusted by? - ansa. Selecting correct thickness shims (correct answer) B. Adjusting the length of the servo stem (not the answer) C. Adding or removing clutch plates D. Adjusting the pump position High engine idle speed will likely cause: - ansa. Harsh engagement from nuetral to drive. B. Low line pressure and early upshifts. (possible correct awnser) C. Direct upshift from first to third. D. All of the above. (not the awnser)
Most basic 3-speed transmissions apply a forward clutch _____ to take off in drive. - ansa. A sprag or roller clutch (possible correct awnser) B. A direct clutch C. An intermediate band D. Both b and c. (not correct awnser) Multiple-disc clutch packs in automatic transmsiions are usually applied by:
- ansa. Hydraulic pressure on a piston. (correct awnser) B. Spring pressure C. Govenor pressure D. Spring pressure and a roller clutch. (not the awnser) On a vacuum modulated transmission, no engine vacuum to the transmission would result in: - ansa. Low transmission pressures B. High transmssion pressures. (correct awnser) C. Soft shifts D. None of the above. On vehicles equiped with lock-up converters, when does the clutch unlock?
- ansa. During heavy vehicle acceleration B. In passing gear C. In a coast condition D. All of the above (correct awnser) The car creeps in neutral. What would not cause this to happen? - ansa. Internal valve body leak. B. Low automatic transmission fluid. (correct awnser)
C. Warped clutch plates. D. Incorrect manual valve linkage adjustment. The part of the lock up converter that provides lock up is the: - ansa. Stator B. Clutch (possible correct awnser) C. Pump (not correct awnser) D. Turbine The picture below shows a device for - ansa. Controlling band application B. Compensating govenor pressure C. Compensating line pressure (possible correct awnser) D. Applying a clutch pack ( not the answer) The transmission does not operate properly in overdrive. All other ranges operate fine. According to the chart below, which of the following could cause this? - ansa. A burned forward clutch (c1) B. A defective od brake (bo) (correct awnser) C. An inoperative 2nd brake (b2) D. None of the above The valve shown is: - ansa. Pressure regulator valve (not correct awnser) B. A govenor valve C. A manual valve D. A primary throttle valve Valve body shift valves are operated by: - ansa. Throttle valve pressure. B. Line pressure.
What would be the result if the sun gear was the input member, the carrier was held, and the ring gear was the output member? - ansa. Direct drive B. Overdrive (not the awnser) C. Torque reduction D. Reverse What would you notice first if the transmission filter were restricted? - ansa. Slow or delayed clutch engagement. (correct awnser) B. Hard shifting when cold. C. A clicking noise from the transmission at slow speed) (not correct awnser) D. A loss of power When checking a spool valve from the valve body, you notice it has very square ans sharp edges on its lands. What should you do? - ansa. Gently chamfer the land edges with a fine sharpening stone. (not the awnser) B. Nothing. This is a desirable condition. C. Replace the spool valve with a new one of the exact same part number. D. Smooth the edges with crocus cloth to restore a slight chamfer. When two members of a planetary gear set are locked togeather, the output shaft: - ansa. Turns in the same direction as the input shaft B. Turns at the same speed as the input shaft (correct awnser) C. Does not run D. Turns in the opposite direction as the input shaft. (not the awnser)
Which of the following is likely to cause burned clutch plate bands? - ansa. Internal leaks due to damaged seals. (correct awnser) B. A defective govenor. C. A leaking modulator. D. None of the above. Which of the following should be the average line pressure in drive at idle?
- ansa. 10-15 psi B. 50-70 psi (not the awnser) C. 80-95 psi (possible correct awnser) D. 125-140 psi Which of the following signals the transmission to go into passing gear? - ansa. A reaction valve or a band release sensor B. An electrical switch or mechanical linkage. (possible correct awnser) C. A hydraulic control or a torque sensor D. A govenor valve or a shift clutch (not the answer) Which of these parts would likely be found in the valve body? - ansall of the above Which one of the following would be the result if the sun gear is held, the carrier is the input number, and the ring is the output member? - ansa. Direct drive B. Overdrive C. Reverse (not correct awnser) D. Gear reduction
