The main difference between the internal combustion engine and the diesel engine is that the diesel engine a. does not utilize pistons. b. does not have a crankshaft. c. has no ignition system. d. has no connecting rods.

The diesel engine has no ignition system. (C)
It depends on the compression of the fuel/air mixture to ignite the mixture.

This may be a big part of the reason that Diesel engines always
sound to me as if they are falling apart.

Tell me the answers for your question and you!