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ASE Diesel Practice Test Exam Questions and Answers.
ASEDieselPracticeTestExamQuestionsandAnswers. 
When a diesel engine is operated under a load, coolant continually comes out of the 
radiator overflow and there are bubbles in the radiator. Which of these is the most likely 
cause? 
(A) Too much coolant in the cooling system 
(B) A clogged radiator 
(C) A stuck-open thermostat 
(D) Compression leakage into the cooling system - Correct Answer D 
A diesel engine has excessive black smoke when started in the morning. Which of these 
could be the cau...