ABYC Diesel Engine Certification Exam - Questions and Answers After overheating his engine several times and making the required repairs, the customer
... [Show More] complains of excessive coolant usage. Your tests show that during normal running the engine does not over heat, but coolant is pushing out through the over flow tube of the expansion tank. What would most likely NOT be the cause A. failed pressure cap B. cracked cylinder head C. raw water pump impeller D. cylinder head gasket The owner says his engine (electronic controlled) will not start. He mentioned he has added a power connection for his portable GPS at the dash since he last used the boat. Where might you begin to find the problem? A. the main engine battery condition B. the neutral switch functionality C. his choice of connection points for power and ground of his portable GPS D. the circuit breaker panel The owner is complaining of low power. On a sea trial under full load you measure exhaust gas temperature and boost pressure. You explain to the owner you feel he might have a cylinder not putting out full power because: A. The boost is higher than specification and the temperature is below specification B. the boost and the exhaust gas temperature are both above normal C. the boost and the temperature are both below specification D. the boost is lower than specification and the temp is above specification The owner is complaining of low top end speed. On a sea trial under full load you measure exhaust gas temperature and boost pressure. you explain to the owner you feel the engine is overloaded based on A. the boost is higher than specification and the temp is below specification B. the boost and the exhaust gas temp are both above normal C. the boost and the temp are both below specification D. the boost is lower than specification and the temp is above specification A normally operating raw water cooled engine runs at approximately A. 145 degrees F B. 180 degrees F C. 100 degrees F D. 200 degrees F What is the operating range of a modern closed cooling system? A. 130 to 145 F B. 145 to 165 F C. 180 to 215F D. All of the above E. none of the above Which device controls the engine temperature? A. the circular pump B. The raw water pump C. the thermostat D. the heat exchanger A pressure cap on an expansion tank raises the boiling point of the coolant by______ degrees F for every 1 psi in the system A. 1 Degree F B. 3 Degrees F C. 5 Degrees F D. 14 Degrees F The cooling system removes approximately _____ of the heat produced by combustion. A. 10% B. 33% C. 60% D. 75% When draining a raw water cooled engine, the tech removes the drain plug but very little water comes out. What is most likely cause? A. The water has evaporated B. The engine drained itself C. It may be blocked, use a tool to check D. You have to remove the thermostat Changing the oil one a diesel inboard the tech would use A. An API rating designated C B. An "SAE' rated oil
C. TCW-3 D. FCW The distance the piston of an internal combustion engine travels in one complete movement (180 degrees of crankshaft rotation) from TDC to BDC is called the: A: Bore B. Stroke C. Power stroke D. Pass What engine part is sometimes given a shape known as "toroidal" to induce swirl? A. Piston Shaft B. Piston Head C. Piston Ring D. Piston Crown Which of the following is the proper way for engine room ventilation ducting to be routed? A. Gas engine room air intake to the top, exhaust air from the bottom of room/ diesel intake to bottom, exhaust to top B. Gas engine room air intake to the bottom, exhaust air from the top of engine room/ diesel intake to the top, exhaust to the bottom C. Both gas and diesel intake/exhaust locations to the top D. Both gas and diesel intake / exhaust locations to the bottom When operating normally, the raw water pump can reach temps of? A. 180F to 220F B. 220F to 260F C. 80C to 100C D. 40F to 120F Which of the following standards address installation of control cables? A. P-4 B. P-14 C. P-24 D both B and C Electrolyte in a led-acid storage battery consists of water and ________ acid? A. Boric B. Sulfuric [Show Less]