Describe the noise caused by an excessively worn crankshaft main bearing.

What will be an ideal response?


Worn crankshaft main bearings cause a heavy thumping knock for a brief time when the engine is first started after it has been shut off for several hours.

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You supply air to the trailer tanks by:

a. Connecting the service line glad hand. b. Pulling out the trailer air supply valve. c. Pushing in the trailer air supply valve.

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The SCR can control all of the positive waveform through the use of ____ shifting.

A. diode B. phase C. rectifier D. gate

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Hydraulic lines must be _____ so that energy will be transmitted effectively throughout the system

a. thin b. rigid c. flexible d. the proper size

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What happens if the DEF runs low during vehicle operation?

A. The engine is immediately shut down. B. The vehicle enters progressive trim back modes. C. Nothing. D. A code is logged in the PCM to notify technicians the next time vehicle is serviced.

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